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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TradeAndOtherCurrentReceivables" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_TradeAndOtherCurrentReceivables"/>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_CurrentAssets" xml:lang="en-US">Current assets</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_H6460J968H94_ifrs-full_CurrentAssets" xml:lang="en-US">Total current assets</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_NoncurrentAssetsAbstract" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_NoncurrentAssetsAbstract"/>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_NoncurrentAssetsAbstract" xml:lang="en-US">Non-current assets</label>
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<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_RoyaltyAndStreamInterests" xlink:label="loc_F4248H746F72_mtaff_RoyaltyAndStreamInterests"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_RoyaltyAndStreamInterests" xml:lang="en-US">Royalty And Stream Interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_RoyaltyAndStreamInterests" xml:lang="en-US">Royalty, stream, and other interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_RoyaltyAndStreamInterests" xml:lang="en-US">Royalty and stream interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_H6460J968H94_mtaff_RoyaltyAndStreamInterests" xml:lang="en-US">Beginning balance</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_H6460J968H94_mtaff_RoyaltyAndStreamInterests" xml:lang="en-US">Ending Balance</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_RoyaltyAndStreamInterests" xml:lang="en-US">The carrying amount of royalty and stream interests.</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_InvestmentAccountedForUsingEquityMethod" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_InvestmentAccountedForUsingEquityMethod"/>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_InvestmentAccountedForUsingEquityMethod" xml:lang="en-US">Investment in Silverback</label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_InvestmentAccountedForUsingEquityMethod" xml:lang="en-US">Ending balance</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_NoncurrentAssets" xlink:label="loc_F4248H746F72_ifrs-full_NoncurrentAssets"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_NoncurrentAssets" xml:lang="en-US">Non-current assets</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_H6460J968H94_ifrs-full_NoncurrentAssets" xml:lang="en-US">Total non-current assets</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_Assets" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_Assets"/>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_Assets" xml:lang="en-US">Total assets</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_Assets" xml:lang="en-US">TOTAL ASSETS</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_Assets" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_Assets"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_EquityAndLiabilitiesAbstract" xlink:label="loc_F4248H746F72_ifrs-full_EquityAndLiabilitiesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_EquityAndLiabilitiesAbstract" xml:lang="en-US">LIABILITIES AND EQUITY</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_EquityAndLiabilitiesAbstract" xlink:to="lab_H6460J968H94_ifrs-full_EquityAndLiabilitiesAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_LiabilitiesAbstract" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_LiabilitiesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_LiabilitiesAbstract" xml:lang="en-US">LIABILITIES</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_LiabilitiesAbstract" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_LiabilitiesAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CurrentLiabilitiesAbstract" xlink:label="loc_F4248H746F72_ifrs-full_CurrentLiabilitiesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_CurrentLiabilitiesAbstract" xml:lang="en-US">Current Liabilities [abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_CurrentLiabilitiesAbstract" xml:lang="en-US">Current liabilities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_CurrentLiabilitiesAbstract" xlink:to="lab_H6460J968H94_ifrs-full_CurrentLiabilitiesAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TradeAndOtherCurrentPayables" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_TradeAndOtherCurrentPayables"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_TradeAndOtherCurrentPayables" xml:lang="en-US">Trade and other current payables</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_TradeAndOtherCurrentPayables" xml:lang="en-US">Accounts payable and accrued liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_TradeAndOtherCurrentPayables" xml:lang="en-US">Trade and other payables</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_TradeAndOtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xml:lang="en-US">Trade and other payables</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_TradeAndOtherCurrentPayables" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_TradeAndOtherCurrentPayables"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ShorttermBorrowings" xlink:label="loc_F4248H746F72_ifrs-full_ShorttermBorrowings"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_ShorttermBorrowings" xml:lang="en-US">Current borrowings</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_ShorttermBorrowings" xml:lang="en-US">Loans payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_ShorttermBorrowings" xml:lang="en-US">Less: current portion</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_ShorttermBorrowings" xlink:to="lab_H6460J968H94_ifrs-full_ShorttermBorrowings"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CurrentLiabilities" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_CurrentLiabilities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CurrentLiabilities" xml:lang="en-US">Current liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CurrentLiabilities" xml:lang="en-US">Total current liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CurrentLiabilities" xml:lang="en-US">Current liabilities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_CurrentLiabilities" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_CurrentLiabilities"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_NoncurrentLiabilitiesAbstract" xlink:label="loc_F4248H746F72_ifrs-full_NoncurrentLiabilitiesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_NoncurrentLiabilitiesAbstract" xml:lang="en-US">Non-current liabilities [abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_NoncurrentLiabilitiesAbstract" xml:lang="en-US">Non-current liabilities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_NoncurrentLiabilitiesAbstract" xlink:to="lab_H6460J968H94_ifrs-full_NoncurrentLiabilitiesAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_LongtermBorrowings" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_LongtermBorrowings"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_LongtermBorrowings" xml:lang="en-US">Non-current portion of non-current borrowings</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_LongtermBorrowings" xml:lang="en-US">Loans payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_LongtermBorrowings" xml:lang="en-US">Long term portion</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_LongtermBorrowings" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_LongtermBorrowings"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DeferredTaxLiabilities" xlink:label="loc_F4248H746F72_ifrs-full_DeferredTaxLiabilities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DeferredTaxLiabilities" xml:lang="en-US">Deferred tax liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_DeferredTaxLiabilities" xml:lang="en-US">Deferred income tax liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_DeferredTaxLiabilities" xml:lang="en-US">Deferred tax liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_ifrs-full_DeferredTaxLiabilities" xml:lang="en-US">Deferred tax liabilities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DeferredTaxLiabilities" xlink:to="lab_H6460J968H94_ifrs-full_DeferredTaxLiabilities"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_NoncurrentLiabilities" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_NoncurrentLiabilities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_NoncurrentLiabilities" xml:lang="en-US">Non-current liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_NoncurrentLiabilities" xml:lang="en-US">Total non-current liabilities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_NoncurrentLiabilities" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_NoncurrentLiabilities"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_Liabilities" xlink:label="loc_F4248H746F72_ifrs-full_Liabilities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_Liabilities" xml:lang="en-US">Liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_H6460J968H94_ifrs-full_Liabilities" xml:lang="en-US">Total liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_ifrs-full_Liabilities" xml:lang="en-US">Total liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:label="lab_H6460J968H94_ifrs-full_Liabilities" xml:lang="en-US">Total liabilities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_Liabilities" xlink:to="lab_H6460J968H94_ifrs-full_Liabilities"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_EquityAbstract" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_EquityAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_EquityAbstract" xml:lang="en-US">EQUITY</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_EquityAbstract" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_EquityAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_IssuedCapital" xlink:label="loc_F4248H746F72_ifrs-full_IssuedCapital"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_IssuedCapital" xml:lang="en-US">Issued capital</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_IssuedCapital" xml:lang="en-US">Share capital</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_IssuedCapital" xlink:to="lab_H6460J968H94_ifrs-full_IssuedCapital"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_OtherReserves" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_OtherReserves"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_OtherReserves" xml:lang="en-US">Other reserves</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_OtherReserves" xml:lang="en-US">Reserves</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_OtherReserves" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_OtherReserves"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_RetainedEarnings" xlink:label="loc_F4248H746F72_ifrs-full_RetainedEarnings"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_RetainedEarnings" xml:lang="en-US">Retained earnings</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_RetainedEarnings" xml:lang="en-US">Deficit</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_ifrs-full_RetainedEarnings" xml:lang="en-US">Cumulative deficit</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_RetainedEarnings" xlink:to="lab_H6460J968H94_ifrs-full_RetainedEarnings"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_Equity" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_Equity"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_Equity" xml:lang="en-US">Equity</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_Equity" xml:lang="en-US">Total equity</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_Equity" xml:lang="en-US">Balance opening</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_Equity" xml:lang="en-US">Balance ending</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_Equity" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_Equity"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_EquityAndLiabilities" xlink:label="loc_F4248H746F72_ifrs-full_EquityAndLiabilities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_EquityAndLiabilities" xml:lang="en-US">Equity and liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_H6460J968H94_ifrs-full_EquityAndLiabilities" xml:lang="en-US">TOTAL LIABILITIES AND EQUITY</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_EquityAndLiabilities" xlink:to="lab_H6460J968H94_ifrs-full_EquityAndLiabilities"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_IncomeStatementAbstract" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_IncomeStatementAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IncomeStatementAbstract" xml:lang="en-US">Profit or loss [Abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_IncomeStatementAbstract" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_IncomeStatementAbstract"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_RevenueFromStreamInterest" xlink:label="loc_F4248H746F72_mtaff_RevenueFromStreamInterest"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_RevenueFromStreamInterest" xml:lang="en-US">Revenue From Stream Interest</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_RevenueFromStreamInterest" xml:lang="en-US">Revenue from stream interest</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_RevenueFromStreamInterest" xml:lang="en-US">Revenue from stream interest.</label>
<label xlink:type="resource" xlink:label="lab_H6460J968H94_mtaff_RevenueFromStreamInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Revenue from stream interest</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_RevenueFromStreamInterest" xlink:to="lab_H6460J968H94_mtaff_RevenueFromStreamInterest"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CostOfSales" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_CostOfSales"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CostOfSales" xml:lang="en-US">Cost of sales</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CostOfSales" xml:lang="en-US">Cost of sales</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CostOfSales" xml:lang="en-US">Cost of sales, excluding depletion</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CostOfSales" xml:lang="en-US">Cost of sales, excluding depletion</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_CostOfSales" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_CostOfSales"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DepletionOnStreamInterest" xlink:label="loc_F4248H746F72_mtaff_DepletionOnStreamInterest"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_DepletionOnStreamInterest" xml:lang="en-US">Depletion On Stream Interest</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_DepletionOnStreamInterest" xml:lang="en-US">Depletion on stream interest (Note 4)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_DepletionOnStreamInterest" xml:lang="en-US">The amount of expenses arising form depletion on stream interest.</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_mtaff_DepletionOnStreamInterest" xml:lang="en-US">Depletion on stream interest</label>
<label xlink:type="resource" xlink:label="lab_H6460J968H94_mtaff_DepletionOnStreamInterest" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Depletion</label>
<label xlink:type="resource" xlink:label="lab_H6460J968H94_mtaff_DepletionOnStreamInterest" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xml:lang="en-US">Depletion</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_GrossProfit" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_GrossProfit"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_GrossProfit" xml:lang="en-US">Gross profit</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_GrossProfit" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xml:lang="en-US">Gross profit</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_GrossProfit" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_GrossProfit"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_GeneralAndAdministrativeExpense" xlink:label="loc_F4248H746F72_ifrs-full_GeneralAndAdministrativeExpense"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_GeneralAndAdministrativeExpense" xml:lang="en-US">General and administrative expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_GeneralAndAdministrativeExpense" xml:lang="en-US">General and administrative expenses</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_ifrs-full_GeneralAndAdministrativeExpense" xml:lang="en-US">General and administrative expenses</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_GeneralAndAdministrativeExpense" xlink:to="lab_H6460J968H94_ifrs-full_GeneralAndAdministrativeExpense"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xml:lang="en-US">Expense from share-based payment transactions with employees</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xml:lang="en-US">Share-based payments</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xml:lang="en-US">Share-based payments</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ProfitLossFromContinuingOperations" xlink:label="loc_F4248H746F72_ifrs-full_ProfitLossFromContinuingOperations"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_ProfitLossFromContinuingOperations" xml:lang="en-US">Profit (loss) from continuing operations</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_H6460J968H94_ifrs-full_ProfitLossFromContinuingOperations" xml:lang="en-US">Loss from operations</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_ProfitLossFromContinuingOperations" xlink:to="lab_H6460J968H94_ifrs-full_ProfitLossFromContinuingOperations"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" xml:lang="en-US">Share of profit (loss) of associates accounted for using equity method</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" xml:lang="en-US">Share of net income of Silverback</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" xml:lang="en-US">Income in Silverback for the period/year</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" xml:lang="en-US">Share of net income of Silverback</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_InterestExpense" xlink:label="loc_F4248H746F72_ifrs-full_InterestExpense"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_InterestExpense" xml:lang="en-US">Interest expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_InterestExpense" xml:lang="en-US">Interest expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_ifrs-full_InterestExpense" xml:lang="en-US">Interest expense</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_InterestExpense" xlink:to="lab_H6460J968H94_ifrs-full_InterestExpense"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_OtherExpenseByNature" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_OtherExpenseByNature"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_OtherExpenseByNature" xml:lang="en-US">Other expenses, by nature</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_OtherExpenseByNature" xml:lang="en-US">Other expenses</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_OtherExpenseByNature" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_OtherExpenseByNature"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_NetForeignExchangeLoss" xlink:label="loc_F4248H746F72_ifrs-full_NetForeignExchangeLoss"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_NetForeignExchangeLoss" xml:lang="en-US">Net foreign exchange loss</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_NetForeignExchangeLoss" xml:lang="en-US">Foreign exchange loss</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_ifrs-full_NetForeignExchangeLoss" xml:lang="en-US">Foreign exchange loss</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_NetForeignExchangeLoss" xlink:to="lab_H6460J968H94_ifrs-full_NetForeignExchangeLoss"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ProfitLossBeforeTax" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_ProfitLossBeforeTax"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ProfitLossBeforeTax" xml:lang="en-US">Profit (loss) before tax</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ProfitLossBeforeTax" xml:lang="en-US">Loss before income taxes</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ProfitLossBeforeTax" xml:lang="en-US">Loss before income taxes</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_ProfitLossBeforeTax" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_ProfitLossBeforeTax"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CurrentTaxExpenseIncome" xlink:label="loc_F4248H746F72_ifrs-full_CurrentTaxExpenseIncome"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_CurrentTaxExpenseIncome" xml:lang="en-US">Current tax expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_CurrentTaxExpenseIncome" xml:lang="en-US">Current income tax expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_ifrs-full_CurrentTaxExpenseIncome" xml:lang="en-US">Current income tax expense</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_CurrentTaxExpenseIncome" xlink:to="lab_H6460J968H94_ifrs-full_CurrentTaxExpenseIncome"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DeferredTaxExpenseIncome" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DeferredTaxExpenseIncome"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DeferredTaxExpenseIncome" xml:lang="en-US">Deferred tax expense (income)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DeferredTaxExpenseIncome" xml:lang="en-US">Deferred income tax (expense) recovery</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DeferredTaxExpenseIncome" xml:lang="en-US">Deferred income tax recovery (expense)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DeferredTaxExpenseIncome" xml:lang="en-US">Total income tax expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DeferredTaxExpenseIncome" xml:lang="en-US">Deferred income tax recovery (expense)</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DeferredTaxExpenseIncome" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DeferredTaxExpenseIncome"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ProfitLoss" xlink:label="loc_F4248H746F72_ifrs-full_ProfitLoss"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_ProfitLoss" xml:lang="en-US">Profit (loss)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_ProfitLoss" xml:lang="en-US">Net loss</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveLabel" xlink:label="lab_H6460J968H94_ifrs-full_ProfitLoss" xml:lang="en-US">Loss for the year</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_H6460J968H94_ifrs-full_ProfitLoss" xml:lang="en-US">Net loss</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_ProfitLoss" xlink:to="lab_H6460J968H94_ifrs-full_ProfitLoss"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_OtherComprehensiveIncomeAbstract" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_OtherComprehensiveIncomeAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_OtherComprehensiveIncomeAbstract" xml:lang="en-US">Other comprehensive income [abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_OtherComprehensiveIncomeAbstract" xml:lang="en-US">Other comprehensive income</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_OtherComprehensiveIncomeAbstract" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_OtherComprehensiveIncomeAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract" xlink:label="loc_F4248H746F72_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract" xml:lang="en-US">Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract" xml:lang="en-US">Items that may be reclassified subsequently to profit and loss:</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract" xlink:to="lab_H6460J968H94_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation" xml:lang="en-US">Other comprehensive income, net of tax, exchange differences on translation</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation" xml:lang="en-US">Foreign currency translation adjustment</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_OtherComprehensiveIncome" xlink:label="loc_F4248H746F72_ifrs-full_OtherComprehensiveIncome"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_OtherComprehensiveIncome" xml:lang="en-US">Other comprehensive income</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_OtherComprehensiveIncome" xml:lang="en-US">Other comprehensive income</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_H6460J968H94_ifrs-full_OtherComprehensiveIncome" xml:lang="en-US">Other comprehensive loss</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_OtherComprehensiveIncome" xlink:to="lab_H6460J968H94_ifrs-full_OtherComprehensiveIncome"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ComprehensiveIncome" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_ComprehensiveIncome"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ComprehensiveIncome" xml:lang="en-US">Comprehensive income</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ComprehensiveIncome" xml:lang="en-US">Net income and comprehensive income for the year</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ComprehensiveIncome" xml:lang="en-US">Total comprehensive loss</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_ComprehensiveIncome" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_ComprehensiveIncome"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_BasicEarningsLossPerShare" xlink:label="loc_F4248H746F72_ifrs-full_BasicEarningsLossPerShare"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_BasicEarningsLossPerShare" xml:lang="en-US">Basic earnings (loss) per share</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_BasicEarningsLossPerShare" xml:lang="en-US">Earnings (loss) per share - basic and diluted (in dollars per share)</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_BasicEarningsLossPerShare" xlink:to="lab_H6460J968H94_ifrs-full_BasicEarningsLossPerShare"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_WeightedAverageShares" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_WeightedAverageShares"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_WeightedAverageShares" xml:lang="en-US">Weighted average number of ordinary shares outstanding</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_WeightedAverageShares" xml:lang="en-US">Weighted average number of shares outstanding - basic and diluted (in shares)</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_WeightedAverageShares" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_WeightedAverageShares"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_StatementOfCashFlowsAbstract" xlink:label="loc_F4248H746F72_ifrs-full_StatementOfCashFlowsAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_StatementOfCashFlowsAbstract" xml:lang="en-US">Statement of cash flows [Abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_StatementOfCashFlowsAbstract" xlink:to="lab_H6460J968H94_ifrs-full_StatementOfCashFlowsAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xml:lang="en-US">Cash flows from (used in) operating activities [abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xml:lang="en-US">CASH FLOWS FROM OPERATING ACTIVITIES</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:label="loc_F4248H746F72_ifrs-full_AdjustmentsForReconcileProfitLossAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xml:lang="en-US">Adjustments to reconcile profit (loss) [abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xml:lang="en-US">Items not affecting cash:</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:to="lab_H6460J968H94_ifrs-full_AdjustmentsForReconcileProfitLossAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod" xml:lang="en-US">Adjustments for undistributed profits of investments accounted for using equity method</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod" xml:lang="en-US">Share of net income of Silverback</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod" xml:lang="en-US">Share of net income of Silverback</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AdjustmentsForDepletionOnStreamInterest" xlink:label="loc_F4248H746F72_mtaff_AdjustmentsForDepletionOnStreamInterest"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_AdjustmentsForDepletionOnStreamInterest" xml:lang="en-US">Adjustments For Depletion On Stream Interest</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_AdjustmentsForDepletionOnStreamInterest" xml:lang="en-US">Depletion on stream interest</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_AdjustmentsForDepletionOnStreamInterest" xml:lang="en-US">Adjustments for depletion on stream interest to reconcile profit (loss) to net cash flow from (used in) operating activities.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_AdjustmentsForDepletionOnStreamInterest" xlink:to="lab_H6460J968H94_mtaff_AdjustmentsForDepletionOnStreamInterest"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_AdjustmentsForInterestExpense" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_AdjustmentsForInterestExpense"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_AdjustmentsForInterestExpense" xml:lang="en-US">Adjustments for interest expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_AdjustmentsForInterestExpense" xml:lang="en-US">Interest expense</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_AdjustmentsForInterestExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Interest expense</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_AdjustmentsForInterestExpense" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_AdjustmentsForInterestExpense"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities" xlink:label="loc_F4248H746F72_ifrs-full_AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities" xml:lang="en-US">Adjustments for increase (decrease) in employee benefit liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities" xml:lang="en-US">Share-based payments</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities" xlink:to="lab_H6460J968H94_ifrs-full_AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_AdjustmentsForDeferredTaxExpense" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_AdjustmentsForDeferredTaxExpense"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_AdjustmentsForDeferredTaxExpense" xml:lang="en-US">Adjustments for deferred tax expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_AdjustmentsForDeferredTaxExpense" xml:lang="en-US">Deferred income tax expense</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_AdjustmentsForDeferredTaxExpense" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_AdjustmentsForDeferredTaxExpense"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains" xlink:label="loc_F4248H746F72_ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains" xml:lang="en-US">Adjustments for unrealised foreign exchange losses (gains)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains" xml:lang="en-US">Unrealized foreign exchange effect</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains" xlink:to="lab_H6460J968H94_ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains"/>






<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ChangesInNonCashWorkingCapitalItemsAbstract" xlink:label="loc_F4248H746F72_mtaff_ChangesInNonCashWorkingCapitalItemsAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ChangesInNonCashWorkingCapitalItemsAbstract" xml:lang="en-US">Changes In Non Cash Working Capital Items [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_ChangesInNonCashWorkingCapitalItemsAbstract" xml:lang="en-US">Changes in non-cash working capital items:</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ChangesInNonCashWorkingCapitalItemsAbstract" xlink:to="lab_H6460J968H94_mtaff_ChangesInNonCashWorkingCapitalItemsAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable" xml:lang="en-US">Adjustments for decrease (increase) in trade accounts receivable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable" xml:lang="en-US">Trade receivables and other</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAccountPayable" xlink:label="loc_F4248H746F72_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAccountPayable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAccountPayable" xml:lang="en-US">Adjustments for increase (decrease) in trade accounts payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAccountPayable" xml:lang="en-US">Trade and other payables</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAccountPayable" xlink:to="lab_H6460J968H94_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAccountPayable"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CashFlowsFromUsedInOperatingActivities" xml:lang="en-US">Cash flows from (used in) operating activities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CashFlowsFromUsedInOperatingActivities" xml:lang="en-US">Net cash provided by operating activities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:label="loc_F4248H746F72_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xml:lang="en-US">Cash flows from (used in) investing activities [abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xml:lang="en-US">CASH FLOWS FROM INVESTING ACTIVITIES</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:to="lab_H6460J968H94_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_CashFlowsUsedForAcquisitionsOfRoyaltyAndStreamInterests" xlink:label="loc_IF21F453I7K897H8F732_mtaff_CashFlowsUsedForAcquisitionsOfRoyaltyAndStreamInterests"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CashFlowsUsedForAcquisitionsOfRoyaltyAndStreamInterests" xml:lang="en-US">Cash Flows Used For Acquisitions Of Royalty And Stream Interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CashFlowsUsedForAcquisitionsOfRoyaltyAndStreamInterests" xml:lang="en-US">Purchase price of acquisition</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CashFlowsUsedForAcquisitionsOfRoyaltyAndStreamInterests" xml:lang="en-US">The aggregate cash flows used in acquisitions of royalty and stream interests, classified as investing activities.</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CashFlowsUsedForAcquisitionsOfRoyaltyAndStreamInterests" xml:lang="en-US">Acquisitions of royalty and stream interests, net</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_CashFlowsUsedForAcquisitionsOfRoyaltyAndStreamInterests" xlink:to="lab_KH43H675K9M019J0H954_mtaff_CashFlowsUsedForAcquisitionsOfRoyaltyAndStreamInterests"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_RecoveriesFromRoyaltyAndStreamInterests" xlink:label="loc_F4248H746F72_mtaff_RecoveriesFromRoyaltyAndStreamInterests"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_RecoveriesFromRoyaltyAndStreamInterests" xml:lang="en-US">Recoveries From Royalty And Stream Interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_RecoveriesFromRoyaltyAndStreamInterests" xml:lang="en-US">Recoveries from royalty and stream interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_RecoveriesFromRoyaltyAndStreamInterests" xml:lang="en-US">Recoveries from royalty and stream interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_RecoveriesFromRoyaltyAndStreamInterests" xlink:to="lab_H6460J968H94_mtaff_RecoveriesFromRoyaltyAndStreamInterests"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DividendsReceivedFromAssociatesClassifiedAsInvestingActivities" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DividendsReceivedFromAssociatesClassifiedAsInvestingActivities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DividendsReceivedFromAssociatesClassifiedAsInvestingActivities" xml:lang="en-US">Dividends received from associates, classified as investing activities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DividendsReceivedFromAssociatesClassifiedAsInvestingActivities" xml:lang="en-US">Dividend received from Silverback</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DividendsReceivedFromAssociatesClassifiedAsInvestingActivities" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DividendsReceivedFromAssociatesClassifiedAsInvestingActivities"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:label="loc_F4248H746F72_ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_CashFlowsFromUsedInInvestingActivities" xml:lang="en-US">Cash flows from (used in) investing activities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_H6460J968H94_ifrs-full_CashFlowsFromUsedInInvestingActivities" xml:lang="en-US">Net cash used in investing activities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:to="lab_H6460J968H94_ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xml:lang="en-US">Cash flows from (used in) financing activities [abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xml:lang="en-US">CASH FLOWS FROM FINANCING ACTIVITIES</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ProceedsFromIssuingShares" xlink:label="loc_F4248H746F72_ifrs-full_ProceedsFromIssuingShares"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_ProceedsFromIssuingShares" xml:lang="en-US">Proceeds from issuing shares</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_ProceedsFromIssuingShares" xml:lang="en-US">Private placements, net</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_ProceedsFromIssuingShares" xlink:to="lab_H6460J968H94_ifrs-full_ProceedsFromIssuingShares"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ProceedsFromExerciseOfOptions" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_ProceedsFromExerciseOfOptions"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ProceedsFromExerciseOfOptions" xml:lang="en-US">Proceeds from exercise of options</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ProceedsFromExerciseOfOptions" xml:lang="en-US">Proceeds from exercise of stock options</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_ProceedsFromExerciseOfOptions" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_ProceedsFromExerciseOfOptions"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ProceedsFromExerciseOfSharePurchaseWarrants" xlink:label="loc_F4248H746F72_mtaff_ProceedsFromExerciseOfSharePurchaseWarrants"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ProceedsFromExerciseOfSharePurchaseWarrants" xml:lang="en-US">Proceeds From Exercise Of Share Purchase Warrants</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_ProceedsFromExerciseOfSharePurchaseWarrants" xml:lang="en-US">Proceeds from exercise of share purchase warrants</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ProceedsFromExerciseOfSharePurchaseWarrants" xml:lang="en-US">The cash inflow from the exercise of share purchase warrants.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ProceedsFromExerciseOfSharePurchaseWarrants" xlink:to="lab_H6460J968H94_mtaff_ProceedsFromExerciseOfSharePurchaseWarrants"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DividendsPaidClassifiedAsFinancingActivities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xml:lang="en-US">Dividends paid, classified as financing activities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xml:lang="en-US">Dividend paid</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DividendsPaidClassifiedAsFinancingActivities"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ProceedsFromNoncurrentBorrowings" xlink:label="loc_F4248H746F72_ifrs-full_ProceedsFromNoncurrentBorrowings"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_ProceedsFromNoncurrentBorrowings" xml:lang="en-US">Proceeds from non-current borrowings</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_ProceedsFromNoncurrentBorrowings" xml:lang="en-US">Proceeds from loans payable, net</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_ProceedsFromNoncurrentBorrowings" xlink:to="lab_H6460J968H94_ifrs-full_ProceedsFromNoncurrentBorrowings"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xml:lang="en-US">Repayments of borrowings, classified as financing activities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xml:lang="en-US">Repayment of loan principal</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_InterestPaidClassifiedAsFinancingActivities" xlink:label="loc_F4248H746F72_ifrs-full_InterestPaidClassifiedAsFinancingActivities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_InterestPaidClassifiedAsFinancingActivities" xml:lang="en-US">Interest paid, classified as financing activities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_ifrs-full_InterestPaidClassifiedAsFinancingActivities" xml:lang="en-US">Interest paid</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_InterestPaidClassifiedAsFinancingActivities" xlink:to="lab_H6460J968H94_ifrs-full_InterestPaidClassifiedAsFinancingActivities"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CashFlowsFromUsedInFinancingActivities" xml:lang="en-US">Cash flows from (used in) financing activities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CashFlowsFromUsedInFinancingActivities" xml:lang="en-US">Net cash provided by financing activities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CashFlowsFromUsedInFinancingActivities" xml:lang="en-US">Net cash provided by financing activities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:label="loc_F4248H746F72_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xml:lang="en-US">Effect of exchange rate changes on cash and cash equivalents</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xml:lang="en-US">Effect of exchange rate changes on cash</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xml:lang="en-US">Effect of exchange rate changes on cash</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:to="lab_H6460J968H94_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xml:lang="en-US">Increase (decrease) in cash and cash equivalents</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xml:lang="en-US">Change in cash</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xml:lang="en-US">Change in cash</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_StatementOfChangesInEquityAbstract" xlink:label="loc_F4248H746F72_ifrs-full_StatementOfChangesInEquityAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_StatementOfChangesInEquityAbstract" xml:lang="en-US">Statement of changes in equity [Abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_StatementOfChangesInEquityAbstract" xlink:to="lab_H6460J968H94_ifrs-full_StatementOfChangesInEquityAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_StatementOfChangesInEquityTable" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_StatementOfChangesInEquityTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_StatementOfChangesInEquityTable" xml:lang="en-US">Statement of changes in equity [table]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_StatementOfChangesInEquityTable" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_StatementOfChangesInEquityTable"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="loc_F4248H746F72_ifrs-full_ComponentsOfEquityAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_ComponentsOfEquityAxis" xml:lang="en-US">Components of equity [axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_ComponentsOfEquityAxis" xlink:to="lab_H6460J968H94_ifrs-full_ComponentsOfEquityAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_IssuedCapitalMember" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_IssuedCapitalMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IssuedCapitalMember" xml:lang="en-US">Issued capital [member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IssuedCapitalMember" xml:lang="en-US">Share capital</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_IssuedCapitalMember" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_IssuedCapitalMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_OtherReservesMember" xlink:label="loc_F4248H746F72_ifrs-full_OtherReservesMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_OtherReservesMember" xml:lang="en-US">Other reserves [member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_OtherReservesMember" xml:lang="en-US">Reserves</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_OtherReservesMember" xlink:to="lab_H6460J968H94_ifrs-full_OtherReservesMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_RetainedEarningsMember" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_RetainedEarningsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_RetainedEarningsMember" xml:lang="en-US">Retained earnings [member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_RetainedEarningsMember" xml:lang="en-US">Deficit</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_RetainedEarningsMember" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_RetainedEarningsMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_EquityMember" xlink:label="loc_F4248H746F72_ifrs-full_EquityMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_EquityMember" xml:lang="en-US">Equity [member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_EquityMember" xlink:to="lab_H6460J968H94_ifrs-full_EquityMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_StatementOfChangesInEquityLineItems" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_StatementOfChangesInEquityLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_StatementOfChangesInEquityLineItems" xml:lang="en-US">Statement of changes in equity [line items]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_StatementOfChangesInEquityLineItems" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_StatementOfChangesInEquityLineItems"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_NumberOfSharesOutstanding" xlink:label="loc_F4248H746F72_ifrs-full_NumberOfSharesOutstanding"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfSharesOutstanding" xml:lang="en-US">Number of shares outstanding</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfSharesOutstanding" xml:lang="en-US">Balance opening (shares)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfSharesOutstanding" xml:lang="en-US">Balance ending (shares)</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_NumberOfSharesOutstanding" xlink:to="lab_H6460J968H94_ifrs-full_NumberOfSharesOutstanding"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuances" xlink:label="loc_IF21F453I7K897H8F732_mtaff_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuances"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuances" xml:lang="en-US">Private placements and share issuances</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuances" xml:lang="en-US">Amount represents for private placements and share issuances.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuances" xlink:to="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuances"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuancesShares" xlink:label="loc_F4248H746F72_mtaff_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuancesShares"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuancesShares" xml:lang="en-US">Private placements and share issuances (shares)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuancesShares" xml:lang="en-US">Element represent number of shares related to private placement and shares issuances.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuancesShares" xlink:to="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughPrivatePlacementsAndShareIssuancesShares"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ShareIssueRelatedCost" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_ShareIssueRelatedCost"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ShareIssueRelatedCost" xml:lang="en-US">Share issue costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ShareIssueRelatedCost" xml:lang="en-US">Share issue costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ShareIssueRelatedCost" xml:lang="en-US">Share issue related cost</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ShareIssueRelatedCost" xml:lang="en-US">Share issue costs</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_ShareIssueRelatedCost" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_ShareIssueRelatedCost"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_FindersWarrantsShareIssueRelatedCosts" xlink:label="loc_F4248H746F72_mtaff_FindersWarrantsShareIssueRelatedCosts"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_FindersWarrantsShareIssueRelatedCosts" xml:lang="en-US">Share issue costs, finder's warrants</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_FindersWarrantsShareIssueRelatedCosts" xml:lang="en-US">Represents amount related to finders warrants shares issue related cost.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_FindersWarrantsShareIssueRelatedCosts" xlink:to="lab_H6460J968H94_mtaff_FindersWarrantsShareIssueRelatedCosts"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterests" xlink:label="loc_IF21F453I7K897H8F732_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterests"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterests" xml:lang="en-US">Acquisition of royalty and other interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterests" xml:lang="en-US">Represents amount related to increase (decrease) through acquisition of royalty and stream interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterests" xlink:to="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterests"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterestsInShares" xlink:label="loc_F4248H746F72_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterestsInShares"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterestsInShares" xml:lang="en-US">Acquisition of royalty and other interests (shares)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterestsInShares" xml:lang="en-US">Represents number of share related to acquisition of royalty and stream interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterestsInShares" xlink:to="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyAndStreamInterestsInShares"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments" xml:lang="en-US">Increase (decrease) through conversion of convertible instruments, equity</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments" xml:lang="en-US">Conversion on loan payable</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Proceeds from issuance of common stock on conversion of debenture</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_IncreaseDecreaseSharesThroughConversionOnLoanPayable" xlink:label="loc_F4248H746F72_mtaff_IncreaseDecreaseSharesThroughConversionOnLoanPayable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseSharesThroughConversionOnLoanPayable" xml:lang="en-US">Increase Decrease Shares Through Conversion On Loan Payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseSharesThroughConversionOnLoanPayable" xml:lang="en-US">Conversion on loan payable (shares)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseSharesThroughConversionOnLoanPayable" xml:lang="en-US">Number of shares issued for conversion on loan payable.</label>
<label xlink:type="resource" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseSharesThroughConversionOnLoanPayable" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Number of shares issued</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_IncreaseDecreaseSharesThroughConversionOnLoanPayable" xlink:to="lab_H6460J968H94_mtaff_IncreaseDecreaseSharesThroughConversionOnLoanPayable"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_IncreaseDecreaseThroughExerciseOfOptions" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions" xml:lang="en-US">Exercise of stock options</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_IncreaseDecreaseThroughExerciseOfOptionsShares" xlink:label="loc_F4248H746F72_mtaff_IncreaseDecreaseThroughExerciseOfOptionsShares"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughExerciseOfOptionsShares" xml:lang="en-US">Exercise of stock options (shares)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughExerciseOfOptionsShares" xml:lang="en-US">Proceeds from exercise of options (shares)</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_IncreaseDecreaseThroughExerciseOfOptionsShares" xlink:to="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughExerciseOfOptionsShares"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity" xml:lang="en-US">Exercise of share purchase and finder's warrants</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_IncreaseDecreaseThroughExerciseOfWarrantsEquityInShares" xlink:label="loc_F4248H746F72_mtaff_IncreaseDecreaseThroughExerciseOfWarrantsEquityInShares"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughExerciseOfWarrantsEquityInShares" xml:lang="en-US">Exercise of share purchase and finder's warrants (shares)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughExerciseOfWarrantsEquityInShares" xml:lang="en-US">Represents number of share related to exercise of share purchase and finder's warrants.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_IncreaseDecreaseThroughExerciseOfWarrantsEquityInShares" xlink:to="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughExerciseOfWarrantsEquityInShares"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xml:lang="en-US">Share-based payments</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Share-based payments expense</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ValueOfRestrictedStockUnitIssuedToDirectorsAndOfficers" xlink:label="loc_F4248H746F72_mtaff_ValueOfRestrictedStockUnitIssuedToDirectorsAndOfficers"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ValueOfRestrictedStockUnitIssuedToDirectorsAndOfficers" xml:lang="en-US">Value Of Restricted Stock Unit Issued To Directors And Officers</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_ValueOfRestrictedStockUnitIssuedToDirectorsAndOfficers" xml:lang="en-US">Restricted share units vested</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_ValueOfRestrictedStockUnitIssuedToDirectorsAndOfficers" xml:lang="en-US">Value of restricted stock unit issued to directors and officers</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ValueOfRestrictedStockUnitIssuedToDirectorsAndOfficers" xml:lang="en-US">Value of restricted stock unit issued to directors and officers.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ValueOfRestrictedStockUnitIssuedToDirectorsAndOfficers" xlink:to="lab_H6460J968H94_mtaff_ValueOfRestrictedStockUnitIssuedToDirectorsAndOfficers"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_RestrictedStockUnitIssuedToDirectorsAndOfficers" xlink:label="loc_IF21F453I7K897H8F732_mtaff_RestrictedStockUnitIssuedToDirectorsAndOfficers"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RestrictedStockUnitIssuedToDirectorsAndOfficers" xml:lang="en-US">Restricted Stock Unit Issued To Directors And Officers</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RestrictedStockUnitIssuedToDirectorsAndOfficers" xml:lang="en-US">Restricted share units vested (shares)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RestrictedStockUnitIssuedToDirectorsAndOfficers" xml:lang="en-US">Restricted stock unit issued to directors and officers</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RestrictedStockUnitIssuedToDirectorsAndOfficers" xml:lang="en-US">Number of RSUs directors and officers.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_RestrictedStockUnitIssuedToDirectorsAndOfficers" xlink:to="lab_KH43H675K9M019J0H954_mtaff_RestrictedStockUnitIssuedToDirectorsAndOfficers"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_IncreaseDecreaseLoansPayableThroughIssuedOfWarrants" xlink:label="loc_F4248H746F72_mtaff_IncreaseDecreaseLoansPayableThroughIssuedOfWarrants"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseLoansPayableThroughIssuedOfWarrants" xml:lang="en-US">Warrants issued for loans payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseLoansPayableThroughIssuedOfWarrants" xml:lang="en-US">Amount represents information related to loans payable value increase decrease through issued of warrants.</label>
<label xlink:type="resource" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseLoansPayableThroughIssuedOfWarrants" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Warrants issued for loans payable</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_IncreaseDecreaseLoansPayableThroughIssuedOfWarrants" xlink:to="lab_H6460J968H94_mtaff_IncreaseDecreaseLoansPayableThroughIssuedOfWarrants"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_FindersShareIssueRelatedCosts" xlink:label="loc_IF21F453I7K897H8F732_mtaff_FindersShareIssueRelatedCosts"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FindersShareIssueRelatedCosts" xml:lang="en-US">Share issue costs, finder's shares</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FindersShareIssueRelatedCosts" xml:lang="en-US">Amount related to finders shares issue related costs.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_FindersShareIssueRelatedCosts" xlink:to="lab_KH43H675K9M019J0H954_mtaff_FindersShareIssueRelatedCosts"/>




<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyInterests" xlink:label="loc_IF21F453I7K897H8F732_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyInterests"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyInterests" xml:lang="en-US">Increase Decrease Through Acquisition Of Royalty Interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyInterests" xml:lang="en-US">Acquisition of royalty interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyInterests" xml:lang="en-US">Represents amount related to increase (decrease) through acquisition of royalty interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyInterests" xlink:to="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseThroughAcquisitionOfRoyaltyInterests"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfCommonSharesIssuedForAcquisitionsOfRoyaltyInterests" xlink:label="loc_F4248H746F72_mtaff_NumberOfCommonSharesIssuedForAcquisitionsOfRoyaltyInterests"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_NumberOfCommonSharesIssuedForAcquisitionsOfRoyaltyInterests" xml:lang="en-US">Number Of Common Shares Issued For Acquisitions Of Royalty Interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_NumberOfCommonSharesIssuedForAcquisitionsOfRoyaltyInterests" xml:lang="en-US">Acquisition of royalty interests (in shares)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_NumberOfCommonSharesIssuedForAcquisitionsOfRoyaltyInterests" xml:lang="en-US">Number of common shares issued for acquisitions of royalty interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_NumberOfCommonSharesIssuedForAcquisitionsOfRoyaltyInterests" xml:lang="en-US">Represents the number of common shares issued for acquisitions of royalty interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_NumberOfCommonSharesIssuedForAcquisitionsOfRoyaltyInterests" xlink:to="lab_H6460J968H94_mtaff_NumberOfCommonSharesIssuedForAcquisitionsOfRoyaltyInterests"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_IncreaseDecreaseInDeferredAcquisitionCosts" xlink:label="loc_IF21F453I7K897H8F732_mtaff_IncreaseDecreaseInDeferredAcquisitionCosts"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseInDeferredAcquisitionCosts" xml:lang="en-US">Deferred acquisition costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseInDeferredAcquisitionCosts" xml:lang="en-US">Amount related to deferred acquisition costs.</label>
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<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfCommonSharesWarrantsIssuedAsDeferredAcquisitionCosts" xlink:label="loc_F4248H746F72_mtaff_NumberOfCommonSharesWarrantsIssuedAsDeferredAcquisitionCosts"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_NumberOfCommonSharesWarrantsIssuedAsDeferredAcquisitionCosts" xml:lang="en-US">Number Of Common Shares Warrants Issued As Deferred Acquisition Costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_NumberOfCommonSharesWarrantsIssuedAsDeferredAcquisitionCosts" xml:lang="en-US">Deferred acquisition costs (in shares)</label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_NumberOfCommonSharesWarrantsIssuedAsDeferredAcquisitionCosts" xml:lang="en-US">Represents the number of common shares warrants issued as deferred acquisition costs.</label>
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<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_IncreaseDecreaseThroughPerformanceBasedPaymentTransactions" xlink:label="loc_IF21F453I7K897H8F732_mtaff_IncreaseDecreaseThroughPerformanceBasedPaymentTransactions"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseThroughPerformanceBasedPaymentTransactions" xml:lang="en-US">Increase Decrease Through Performance Based Payment Transactions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseThroughPerformanceBasedPaymentTransactions" xml:lang="en-US">Value of shares issued for performance based share based payments</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseThroughPerformanceBasedPaymentTransactions" xml:lang="en-US">Performance-based share-based payments</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseThroughPerformanceBasedPaymentTransactions" xml:lang="en-US">Amount related to performance based payment transactions.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_IncreaseDecreaseThroughPerformanceBasedPaymentTransactions" xlink:to="lab_KH43H675K9M019J0H954_mtaff_IncreaseDecreaseThroughPerformanceBasedPaymentTransactions"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_IncreaseDecreaseThroughPerformanceBasedPaymentTransactionsInShare" xlink:label="loc_F4248H746F72_mtaff_IncreaseDecreaseThroughPerformanceBasedPaymentTransactionsInShare"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughPerformanceBasedPaymentTransactionsInShare" xml:lang="en-US">Increase Decrease Through Performance Based Payment Transactions In Share</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughPerformanceBasedPaymentTransactionsInShare" xml:lang="en-US">Number of common shares issued for performance based share based payments</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughPerformanceBasedPaymentTransactionsInShare" xml:lang="en-US">Performance-based share-based payments (shares)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_IncreaseDecreaseThroughPerformanceBasedPaymentTransactionsInShare" xml:lang="en-US">Represents number of share related to performance based payments transactions.</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DividendsRecognisedAsDistributionsToOwnersOfParent" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DividendsRecognisedAsDistributionsToOwnersOfParent"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DividendsRecognisedAsDistributionsToOwnersOfParent" xml:lang="en-US">Dividend paid</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DividendsRecognisedAsDistributionsToOwnersOfParent" xml:lang="en-US">Dividend paid</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DividendsRecognisedAsDistributionsToOwnersOfParent" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DividendsRecognisedAsDistributionsToOwnersOfParent"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NatureOfOperationsAbstract" xlink:label="loc_F4248H746F72_mtaff_NatureOfOperationsAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_NatureOfOperationsAbstract" xml:lang="en-US">Nature Of Operations [Abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_NatureOfOperationsAbstract" xlink:to="lab_H6460J968H94_mtaff_NatureOfOperationsAbstract"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DisclosureOfNatureOfOperationsExplanatoryTextBlock" xlink:label="loc_IF21F453I7K897H8F732_mtaff_DisclosureOfNatureOfOperationsExplanatoryTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfNatureOfOperationsExplanatoryTextBlock" xml:lang="en-US">Disclosure Of Nature Of Operations Explanatory [Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfNatureOfOperationsExplanatoryTextBlock" xml:lang="en-US">NATURE OF OPERATIONS</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfNatureOfOperationsExplanatoryTextBlock" xml:lang="en-US">The disclosure of nature of operations.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_DisclosureOfNatureOfOperationsExplanatoryTextBlock" xlink:to="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfNatureOfOperationsExplanatoryTextBlock"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DisclosureOfSignificantAccountingPoliciesAbstract" xlink:label="loc_F4248H746F72_mtaff_DisclosureOfSignificantAccountingPoliciesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_DisclosureOfSignificantAccountingPoliciesAbstract" xml:lang="en-US">Disclosure Of Significant Accounting Policies [Abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_DisclosureOfSignificantAccountingPoliciesAbstract" xlink:to="lab_H6460J968H94_mtaff_DisclosureOfSignificantAccountingPoliciesAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory" xml:lang="en-US">Disclosure of significant accounting policies [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory" xml:lang="en-US">SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TradeAndOtherReceivablesAbstract" xlink:label="loc_F4248H746F72_ifrs-full_TradeAndOtherReceivablesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_TradeAndOtherReceivablesAbstract" xml:lang="en-US">Trade and other receivables [Abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_TradeAndOtherReceivablesAbstract" xlink:to="lab_H6460J968H94_ifrs-full_TradeAndOtherReceivablesAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xml:lang="en-US">Disclosure of trade and other receivables [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xml:lang="en-US">TRADE RECEIVABLES AND OTHER</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_RoyaltyInterestsAndDeferredAcquisitionCostsAbstract" xlink:label="loc_F4248H746F72_mtaff_RoyaltyInterestsAndDeferredAcquisitionCostsAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_RoyaltyInterestsAndDeferredAcquisitionCostsAbstract" xml:lang="en-US">Royalty Interests And Deferred Acquisition Costs [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_RoyaltyInterestsAndDeferredAcquisitionCostsAbstract" xml:lang="en-US">Accounts payable and accrued liabilities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_RoyaltyInterestsAndDeferredAcquisitionCostsAbstract" xlink:to="lab_H6460J968H94_mtaff_RoyaltyInterestsAndDeferredAcquisitionCostsAbstract"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsExplanatoryTextBlock" xlink:label="loc_IF21F453I7K897H8F732_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsExplanatoryTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsExplanatoryTextBlock" xml:lang="en-US">Disclosure Of Royalty Interests And Deferred Acquisition Costs Explanatory [Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsExplanatoryTextBlock" xml:lang="en-US">ROYALTY, STREAM, AND OTHER INTERESTS</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsExplanatoryTextBlock" xml:lang="en-US">Disclosure of royalty interests and deferred acquisition costs explanatory.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsExplanatoryTextBlock" xlink:to="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsExplanatoryTextBlock"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_InvestmentPropertyAbstract" xlink:label="loc_F4248H746F72_ifrs-full_InvestmentPropertyAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_InvestmentPropertyAbstract" xml:lang="en-US">Investment property [Abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_InvestmentPropertyAbstract" xlink:to="lab_H6460J968H94_ifrs-full_InvestmentPropertyAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory" xml:lang="en-US">Disclosure of investments accounted for using equity method [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory" xml:lang="en-US">INVESTMENT IN SILVERBACK</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ScheduleOfDetailedInformationAboutTradeAndOthersPayableAbstract" xlink:label="loc_F4248H746F72_mtaff_ScheduleOfDetailedInformationAboutTradeAndOthersPayableAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ScheduleOfDetailedInformationAboutTradeAndOthersPayableAbstract" xml:lang="en-US">Schedule Of Detailed Information About Trade And Others Payable [Abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ScheduleOfDetailedInformationAboutTradeAndOthersPayableAbstract" xlink:to="lab_H6460J968H94_mtaff_ScheduleOfDetailedInformationAboutTradeAndOthersPayableAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xml:lang="en-US">Disclosure of trade and other payables [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xml:lang="en-US">TRADE AND OTHER PAYABLES</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_LoanPayableAbstract" xlink:label="loc_F4248H746F72_mtaff_LoanPayableAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_LoanPayableAbstract" xml:lang="en-US">Loan Payable [Abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_LoanPayableAbstract" xlink:to="lab_H6460J968H94_mtaff_LoanPayableAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfBorrowingsExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfBorrowingsExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfBorrowingsExplanatory" xml:lang="en-US">Disclosure of borrowings [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfBorrowingsExplanatory" xml:lang="en-US">LOANS PAYABLE</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfBorrowingsExplanatory" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfBorrowingsExplanatory"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_IncomeTaxesAbstract" xlink:label="loc_F4248H746F72_mtaff_IncomeTaxesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_IncomeTaxesAbstract" xml:lang="en-US">Income Taxes [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_IncomeTaxesAbstract" xml:lang="en-US">Difference between Canadian and foreign tax rate</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_IncomeTaxesAbstract" xlink:to="lab_H6460J968H94_mtaff_IncomeTaxesAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfIncomeTaxExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfIncomeTaxExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfIncomeTaxExplanatory" xml:lang="en-US">Disclosure of income tax [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfIncomeTaxExplanatory" xml:lang="en-US">INCOME TAXES</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfIncomeTaxExplanatory" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfIncomeTaxExplanatory"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalAbstract" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfClassesOfShareCapitalAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfClassesOfShareCapitalAbstract" xml:lang="en-US">Disclosure of classes of share capital [Abstract]</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesAbstract" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesAbstract" xml:lang="en-US">Disclosure of transactions between related parties [Abstract]</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfRelatedPartyExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfRelatedPartyExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfRelatedPartyExplanatory" xml:lang="en-US">RELATED PARTY TRANSACTIONS AND BALANCES [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfRelatedPartyExplanatory" xml:lang="en-US">RELATED PARTY TRANSACTIONS AND BALANCES</label>
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<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_SupplementalDisclosureOfCashFlowAbstract" xlink:label="loc_F4248H746F72_mtaff_SupplementalDisclosureOfCashFlowAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_SupplementalDisclosureOfCashFlowAbstract" xml:lang="en-US">Supplemental Disclosure Of Cash Flow [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_SupplementalDisclosureOfCashFlowAbstract" xml:lang="en-US">Aggregate value of private placement units issued on settlement of loans payable</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfCashFlowStatementExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfCashFlowStatementExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfCashFlowStatementExplanatory" xml:lang="en-US">Disclosure of cash flow statement [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfCashFlowStatementExplanatory" xml:lang="en-US">SUPPLEMENTAL DISCLOSURE WITH RESPECT TO CASH FLOWS</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfFinancialInstrumentsAbstract" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfFinancialInstrumentsAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfFinancialInstrumentsAbstract" xml:lang="en-US">Disclosure of detailed information about financial instruments [Abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DisclosureOfFinancialInstrumentsAbstract" xlink:to="lab_H6460J968H94_ifrs-full_DisclosureOfFinancialInstrumentsAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfFinancialInstrumentsExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfFinancialInstrumentsExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfFinancialInstrumentsExplanatory" xml:lang="en-US">Disclosure of financial instruments [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfFinancialInstrumentsExplanatory" xml:lang="en-US">FINANCIAL INSTRUMENTS</label>
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<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DisclosureOfCommitmentAbstract" xlink:label="loc_F4248H746F72_mtaff_DisclosureOfCommitmentAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_DisclosureOfCommitmentAbstract" xml:lang="en-US">Disclosure Of Commitment [Abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_DisclosureOfCommitmentAbstract" xlink:to="lab_H6460J968H94_mtaff_DisclosureOfCommitmentAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfCommitmentsExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfCommitmentsExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfCommitmentsExplanatory" xml:lang="en-US">Disclosure of commitments [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfCommitmentsExplanatory" xml:lang="en-US">COMMITMENTS</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfCommitmentsExplanatory" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfCommitmentsExplanatory"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodAbstract" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodAbstract" xml:lang="en-US">Disclosure of non-adjusting events after reporting period [Abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodAbstract" xlink:to="lab_H6460J968H94_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodExplanatory" xml:lang="en-US">Disclosure of non-adjusting events after reporting period [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodExplanatory" xml:lang="en-US">EVENTS AFTER THE REPORTING DATE</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory" xlink:label="loc_F4248H746F72_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory" xml:lang="en-US">Basis of preparation and measurement [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory" xml:lang="en-US">Basis of preparation and measurement</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory" xlink:to="lab_H6460J968H94_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory"/>




<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfBasisOfConsolidationExplanatory" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfBasisOfConsolidationExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfBasisOfConsolidationExplanatory" xml:lang="en-US">Principles of consolidation [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfBasisOfConsolidationExplanatory" xml:lang="en-US">Principles of consolidation</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DisclosureOfBasisOfConsolidationExplanatory" xlink:to="lab_H6460J968H94_ifrs-full_DisclosureOfBasisOfConsolidationExplanatory"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory" xml:lang="en-US">Foreign currency translation [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory" xml:lang="en-US">Foreign currency translation</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DescriptionOfAccountingPolicyForRoyaltyStreamAndOtherInterestsExplanatoryPolicyTextBlock" xlink:label="loc_F4248H746F72_mtaff_DescriptionOfAccountingPolicyForRoyaltyStreamAndOtherInterestsExplanatoryPolicyTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_DescriptionOfAccountingPolicyForRoyaltyStreamAndOtherInterestsExplanatoryPolicyTextBlock" xml:lang="en-US">Description Of Accounting Policy For Royalty, Stream, And Other Interests Explanatory [Policy Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_DescriptionOfAccountingPolicyForRoyaltyStreamAndOtherInterestsExplanatoryPolicyTextBlock" xml:lang="en-US">Royalty, stream, and other interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_DescriptionOfAccountingPolicyForRoyaltyStreamAndOtherInterestsExplanatoryPolicyTextBlock" xml:lang="en-US">The description of the entity's accounting policy for royalty, stream, and other interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_DescriptionOfAccountingPolicyForRoyaltyStreamAndOtherInterestsExplanatoryPolicyTextBlock" xlink:to="lab_H6460J968H94_mtaff_DescriptionOfAccountingPolicyForRoyaltyStreamAndOtherInterestsExplanatoryPolicyTextBlock"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xml:lang="en-US">Revenue [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xml:lang="en-US">Revenue</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory" xlink:label="loc_F4248H746F72_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory" xml:lang="en-US">Financial instruments [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory" xml:lang="en-US">Financial instruments</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory" xlink:to="lab_H6460J968H94_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory" xml:lang="en-US">Intangible assets [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory" xml:lang="en-US">Intangible assets</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates" xlink:label="loc_F4248H746F72_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates" xml:lang="en-US">Investments in associates [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates" xml:lang="en-US">Investments in associates</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates" xlink:to="lab_H6460J968H94_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory" xml:lang="en-US">Impairment of long-lived assets [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory" xml:lang="en-US">Impairment of non-financial assets</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForIssuedCapitalExplanatory" xlink:label="loc_F4248H746F72_ifrs-full_DescriptionOfAccountingPolicyForIssuedCapitalExplanatory"/>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_DescriptionOfAccountingPolicyForIssuedCapitalExplanatory" xml:lang="en-US">Share capital</label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfDetailedInformationAboutTradeAndOtherReceivablesExplanatoryTextBlock" xml:lang="en-US">Schedule of detailed information about trade and other receivables</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfDetailedInformationAboutTradeAndOtherReceivablesExplanatoryTextBlock" xml:lang="en-US">Tabular disclosure of the trade receivable and the gross carrying value, allowance, and net carrying value as of the balance sheet date.</label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_DisclosureOfDetailedInformationAboutRoyaltyInterestsAndDeferredAcquisitionCostsExplanatoryTextBlock" xml:lang="en-US">Schedule of detailed information about royalty interests and deferred acquisition costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_DisclosureOfDetailedInformationAboutRoyaltyInterestsAndDeferredAcquisitionCostsExplanatoryTextBlock" xml:lang="en-US">Disclosure Of Detailed Information About royalty interests and deferred acquisition costs explanatory.</label>
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<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DisclosureOfDetailedInformationAboutPurchasePriceAllocationForAcquisitionExplanatoryTextBlock" xlink:label="loc_IF21F453I7K897H8F732_mtaff_DisclosureOfDetailedInformationAboutPurchasePriceAllocationForAcquisitionExplanatoryTextBlock"/>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfDetailedInformationAboutPurchasePriceAllocationForAcquisitionExplanatoryTextBlock" xml:lang="en-US">Schedule of detailed information about purchase price allocation for acquisition</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfDetailedInformationAboutPurchasePriceAllocationForAcquisitionExplanatoryTextBlock" xml:lang="en-US">Disclosure Of Detailed Information About purchase price allocation for acquisition Explanatory.</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfReconciliationOfSummarisedFinancialInformationOfAssociateAccountedForUsingEquityMethodToCarryingAmountOfInterestInAssociateExplanatory" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfReconciliationOfSummarisedFinancialInformationOfAssociateAccountedForUsingEquityMethodToCarryingAmountOfInterestInAssociateExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfReconciliationOfSummarisedFinancialInformationOfAssociateAccountedForUsingEquityMethodToCarryingAmountOfInterestInAssociateExplanatory" xml:lang="en-US">Disclosure of reconciliation of summarised financial information of associate accounted for using equity method to carrying amount of interest in associate [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfReconciliationOfSummarisedFinancialInformationOfAssociateAccountedForUsingEquityMethodToCarryingAmountOfInterestInAssociateExplanatory" xml:lang="en-US">Schedule of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfBreakdownOfAssetsAndLiabilitiesAggregatedIntoSingleLineInvestmentBalanceTransitionFromProportionateConsolidationToEquityMethodExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfBreakdownOfAssetsAndLiabilitiesAggregatedIntoSingleLineInvestmentBalanceTransitionFromProportionateConsolidationToEquityMethodExplanatory"/>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfBreakdownOfAssetsAndLiabilitiesAggregatedIntoSingleLineInvestmentBalanceTransitionFromProportionateConsolidationToEquityMethodExplanatory" xml:lang="en-US">Schedule of associates</label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfDetailedInformationAboutTradeAndOtherPayablesTableTextBlock" xml:lang="en-US">DisclosureOfDetailedInformationAboutTradeAndOtherPayablesTableTextBlock</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory"/>
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<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DisclosureOfIncomeTaxExpenseReconciliationExplanatory" xlink:label="loc_IF21F453I7K897H8F732_mtaff_DisclosureOfIncomeTaxExpenseReconciliationExplanatory"/>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfIncomeTaxExpenseReconciliationExplanatory" xml:lang="en-US">Disclosure of income tax expense reconciliation explanatory.</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfDeferredTaxesExplanatory" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfDeferredTaxesExplanatory"/>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory"/>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory" xml:lang="en-US">Schedule of significant temporary differences, unused tax credits, and unused tax losses</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory" xml:lang="en-US">Disclosure of number and weighted average exercise prices of other equity instruments [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory" xml:lang="en-US">Schedule of number and weighted average exercise prices of Restricted share units</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DisclosureOfWarrantsActivityExplanatoryTextBlock" xlink:label="loc_F4248H746F72_mtaff_DisclosureOfWarrantsActivityExplanatoryTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_DisclosureOfWarrantsActivityExplanatoryTextBlock" xml:lang="en-US">Disclosure Of Warrants Activity Explanatory [Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_DisclosureOfWarrantsActivityExplanatoryTextBlock" xml:lang="en-US">Schedule of warrants activity</label>

<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_DisclosureOfWarrantsActivityExplanatoryTextBlock" xlink:to="lab_H6460J968H94_mtaff_DisclosureOfWarrantsActivityExplanatoryTextBlock"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_DisclosureOfWarrantsActivityExplanatoryTextBlock" xml:lang="en-US">The disclosure of warrants activity.</label>

<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory" xml:lang="en-US">Disclosure of indirect measurement of fair value of goods or services received, share options granted during period [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory" xml:lang="en-US">Schedule of pricing model with weighted average assumptions for share option granted</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedOtherEquityInstrumentsGrantedDuringPeriodExplanatory" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedOtherEquityInstrumentsGrantedDuringPeriodExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedOtherEquityInstrumentsGrantedDuringPeriodExplanatory" xml:lang="en-US">Disclosure of indirect measurement of fair value of goods or services received, other equity instruments granted during period [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedOtherEquityInstrumentsGrantedDuringPeriodExplanatory" xml:lang="en-US">Schedule of pricing model with weighted average assumptions for warrant issued</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedOtherEquityInstrumentsGrantedDuringPeriodExplanatory" xlink:to="lab_H6460J968H94_ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedOtherEquityInstrumentsGrantedDuringPeriodExplanatory"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory" xml:lang="en-US">Disclosure of information about key management personnel [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory" xml:lang="en-US">Schedule of transactions between related parties</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DisclosureOfDetailedInformationAboutNetChangeInNonCashWorkingCapitalItemsExplanantoryTextBlock" xlink:label="loc_F4248H746F72_mtaff_DisclosureOfDetailedInformationAboutNetChangeInNonCashWorkingCapitalItemsExplanantoryTextBlock"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_DisclosureOfDetailedInformationAboutNetChangeInNonCashWorkingCapitalItemsExplanantoryTextBlock" xml:lang="en-US">Disclosure Of Detailed Information About Net Change In Non Cash Working Capital Items Explanantory [Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_DisclosureOfDetailedInformationAboutNetChangeInNonCashWorkingCapitalItemsExplanantoryTextBlock" xml:lang="en-US">Schedule of detailed information about net change in non-cash working capital items</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_DisclosureOfDetailedInformationAboutNetChangeInNonCashWorkingCapitalItemsExplanantoryTextBlock" xml:lang="en-US">The disclosure of additional information about net change in non-cash working capital items.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_DisclosureOfDetailedInformationAboutNetChangeInNonCashWorkingCapitalItemsExplanantoryTextBlock" xlink:to="lab_H6460J968H94_mtaff_DisclosureOfDetailedInformationAboutNetChangeInNonCashWorkingCapitalItemsExplanantoryTextBlock"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfReclassificationOfFinancialInstrumentsExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfReclassificationOfFinancialInstrumentsExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfReclassificationOfFinancialInstrumentsExplanatory" xml:lang="en-US">Disclosure of reclassification of financial instruments [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfReclassificationOfFinancialInstrumentsExplanatory" xml:lang="en-US">Schedule of classification of financial instruments</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfReclassificationOfFinancialInstrumentsExplanatory" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfReclassificationOfFinancialInstrumentsExplanatory"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory" xml:lang="en-US">Disclosure of fair value of financial instruments [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory" xml:lang="en-US">Scheule of financial instruments measured at fair value</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory" xlink:to="lab_H6460J968H94_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsExplanatory" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsExplanatory"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsExplanatory" xml:lang="en-US">Disclosure of nature and extent of risks arising from financial instruments [text block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsExplanatory" xml:lang="en-US">Schedule of currency risk through assets and liabilities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsExplanatory" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsExplanatory"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DescriptionOfShareConsolidationBasis" xlink:label="loc_F4248H746F72_mtaff_DescriptionOfShareConsolidationBasis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_DescriptionOfShareConsolidationBasis" xml:lang="en-US">Description Of Share Consolidation Basis</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_DescriptionOfShareConsolidationBasis" xml:lang="en-US">Description of share consolidation basis</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_DescriptionOfShareConsolidationBasis" xml:lang="en-US">Represents information related to share consolidation basis.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_DescriptionOfShareConsolidationBasis" xlink:to="lab_H6460J968H94_mtaff_DescriptionOfShareConsolidationBasis"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfPreConsolidationCommonShares" xlink:label="loc_IF21F453I7K897H8F732_mtaff_NumberOfPreConsolidationCommonShares"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfPreConsolidationCommonShares" xml:lang="en-US">Number Of Pre Consolidation Common Shares</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfPreConsolidationCommonShares" xml:lang="en-US">Number of pre-consolidation common shares</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfPreConsolidationCommonShares" xml:lang="en-US">Detail information about pre consolidation common share result.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_NumberOfPreConsolidationCommonShares" xlink:to="lab_KH43H675K9M019J0H954_mtaff_NumberOfPreConsolidationCommonShares"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfPostConsolidationCommonShares" xlink:label="loc_F4248H746F72_mtaff_NumberOfPostConsolidationCommonShares"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_NumberOfPostConsolidationCommonShares" xml:lang="en-US">Number Of Post Consolidation Common Shares</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_NumberOfPostConsolidationCommonShares" xml:lang="en-US">Number of post-consolidation common shares</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_NumberOfPostConsolidationCommonShares" xml:lang="en-US">Detail information about post consolidation common share result.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_NumberOfPostConsolidationCommonShares" xlink:to="lab_H6460J968H94_mtaff_NumberOfPostConsolidationCommonShares"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsTable" xlink:label="loc_IF21F453I7K897H8F732_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsTable" xml:lang="en-US">Royalty Interests And Deferred Acquisition Costs [Table]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsTable" xml:lang="en-US">Schedule disclosing information related to royalty interests and deferred acquisition costs.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsTable" xlink:to="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsTable"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_BusinessCombinationsAxis" xlink:label="loc_F4248H746F72_ifrs-full_BusinessCombinationsAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_BusinessCombinationsAxis" xml:lang="en-US">Business combinations [axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_BusinessCombinationsAxis" xlink:to="lab_H6460J968H94_ifrs-full_BusinessCombinationsAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_EntitysTotalForBusinessCombinationsMember" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_EntitysTotalForBusinessCombinationsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_EntitysTotalForBusinessCombinationsMember" xml:lang="en-US">Entity's total for business combinations [member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_EntitysTotalForBusinessCombinationsMember" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_EntitysTotalForBusinessCombinationsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AkasabaWestAcquisitionMember" xlink:label="loc_F4248H746F72_mtaff_AkasabaWestAcquisitionMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_AkasabaWestAcquisitionMember" xml:lang="en-US">Akasaba West Acquisition [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_AkasabaWestAcquisitionMember" xml:lang="en-US">Akasaba West acquisition</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_AkasabaWestAcquisitionMember" xml:lang="en-US">Akasaba West acquisition.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_AkasabaWestAcquisitionMember" xlink:to="lab_H6460J968H94_mtaff_AkasabaWestAcquisitionMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_CoeurAcquisitionsMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_CoeurAcquisitionsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CoeurAcquisitionsMember" xml:lang="en-US">Coeur Acquisitions [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CoeurAcquisitionsMember" xml:lang="en-US">Coeur acquisitions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CoeurAcquisitionsMember" xml:lang="en-US">Coeur acquisitions.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_CoeurAcquisitionsMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_CoeurAcquisitionsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_MatamecAcquisitionsMember" xlink:label="loc_F4248H746F72_mtaff_MatamecAcquisitionsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_MatamecAcquisitionsMember" xml:lang="en-US">Matamec Acquisitions [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_MatamecAcquisitionsMember" xml:lang="en-US">Matamec acquisitions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_MatamecAcquisitionsMember" xml:lang="en-US">Matamec acquisitions.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_MatamecAcquisitionsMember" xlink:to="lab_H6460J968H94_mtaff_MatamecAcquisitionsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_FiloAcquisitionsMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_FiloAcquisitionsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FiloAcquisitionsMember" xml:lang="en-US">Filo Acquisitions [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FiloAcquisitionsMember" xml:lang="en-US">Filo acquisitions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FiloAcquisitionsMember" xml:lang="en-US">Filo acquisitions.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_FiloAcquisitionsMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_FiloAcquisitionsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_IepiAcquisitionsMember" xlink:label="loc_F4248H746F72_mtaff_IepiAcquisitionsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_IepiAcquisitionsMember" xml:lang="en-US">Iepi Acquisitions [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_IepiAcquisitionsMember" xml:lang="en-US">IEPI acquisitions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_IepiAcquisitionsMember" xml:lang="en-US">IEPI acquisitions.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_IepiAcquisitionsMember" xlink:to="lab_H6460J968H94_mtaff_IepiAcquisitionsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_OrefindersAcquisitionsMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_OrefindersAcquisitionsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_OrefindersAcquisitionsMember" xml:lang="en-US">Orefinders Acquisitions [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_OrefindersAcquisitionsMember" xml:lang="en-US">Orefinders acquisitions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_OrefindersAcquisitionsMember" xml:lang="en-US">Orefinders acquisitions.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_OrefindersAcquisitionsMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_OrefindersAcquisitionsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AlamosAcquisitionsMember" xlink:label="loc_F4248H746F72_mtaff_AlamosAcquisitionsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_AlamosAcquisitionsMember" xml:lang="en-US">Alamos Acquisitions [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_AlamosAcquisitionsMember" xml:lang="en-US">Alamos acquisitions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_AlamosAcquisitionsMember" xml:lang="en-US">Alamos acquisitions.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_AlamosAcquisitionsMember" xlink:to="lab_H6460J968H94_mtaff_AlamosAcquisitionsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_FifteenMileStreamAcquisitionsMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_FifteenMileStreamAcquisitionsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FifteenMileStreamAcquisitionsMember" xml:lang="en-US">Fifteen Mile Stream Acquisitions [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FifteenMileStreamAcquisitionsMember" xml:lang="en-US">15 Mile Stream acquisitions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FifteenMileStreamAcquisitionsMember" xml:lang="en-US">15 Mile Stream acquisitions.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_FifteenMileStreamAcquisitionsMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_FifteenMileStreamAcquisitionsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DufferinEastAcquisitionMember" xlink:label="loc_F4248H746F72_mtaff_DufferinEastAcquisitionMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_DufferinEastAcquisitionMember" xml:lang="en-US">Dufferin East Acquisition [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_DufferinEastAcquisitionMember" xml:lang="en-US">Dufferin East Acquisition</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_DufferinEastAcquisitionMember" xml:lang="en-US">Dufferin East acquisition.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_DufferinEastAcquisitionMember" xlink:to="lab_H6460J968H94_mtaff_DufferinEastAcquisitionMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_Cap-OesteSurEastAcquisitionMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_Cap-OesteSurEastAcquisitionMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_Cap-OesteSurEastAcquisitionMember" xml:lang="en-US">Cap-Oeste Sur East Acquisition [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_Cap-OesteSurEastAcquisitionMember" xml:lang="en-US">Cap-Oeste Sur East acquisition</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_Cap-OesteSurEastAcquisitionMember" xml:lang="en-US">Cap-Oeste Sur East acquisition.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_Cap-OesteSurEastAcquisitionMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_Cap-OesteSurEastAcquisitionMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_SantaGertrudisAcquisitionsMember" xlink:label="loc_F4248H746F72_mtaff_SantaGertrudisAcquisitionsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_SantaGertrudisAcquisitionsMember" xml:lang="en-US">Santa Gertrudis Acquisitions [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_SantaGertrudisAcquisitionsMember" xml:lang="en-US">Santa Gertrudis acquisitions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_SantaGertrudisAcquisitionsMember" xml:lang="en-US">Santa Gertrudis acquisitions.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_SantaGertrudisAcquisitionsMember" xlink:to="lab_H6460J968H94_mtaff_SantaGertrudisAcquisitionsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ValgoldAcquisitionsMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ValgoldAcquisitionsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ValgoldAcquisitionsMember" xml:lang="en-US">Valgold Acquisitions [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ValgoldAcquisitionsMember" xml:lang="en-US">ValGold acquisitions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ValgoldAcquisitionsMember" xml:lang="en-US">ValGold acquisitions.</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ValgoldAcquisitionsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">ValGold acquisition</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ValgoldAcquisitionsMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ValgoldAcquisitionsMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="loc_F4248H746F72_ifrs-full_CategoriesOfRelatedPartiesAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_CategoriesOfRelatedPartiesAxis" xml:lang="en-US">Categories of related parties [axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:to="lab_H6460J968H94_ifrs-full_CategoriesOfRelatedPartiesAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_EntitysTotalForRelatedPartiesMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_EntitysTotalForRelatedPartiesMember" xml:lang="en-US">Entity's total for related parties [member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_EntitysTotalForRelatedPartiesMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AgnicoEagleMinesLimitedMember" xlink:label="loc_F4248H746F72_mtaff_AgnicoEagleMinesLimitedMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_AgnicoEagleMinesLimitedMember" xml:lang="en-US">Agnico Eagle Mines Limited [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_AgnicoEagleMinesLimitedMember" xml:lang="en-US">Agnico Eagle Mines Limited ("Agnico")</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_AgnicoEagleMinesLimitedMember" xml:lang="en-US">Agnico Eagle Mines Limited ("Agnico")</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_AgnicoEagleMinesLimitedMember" xlink:to="lab_H6460J968H94_mtaff_AgnicoEagleMinesLimitedMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_MiradoMineProjectMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_MiradoMineProjectMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_MiradoMineProjectMember" xml:lang="en-US">Mirado Mine Project [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_MiradoMineProjectMember" xml:lang="en-US">Mirado mine project (Mirado)</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_MiradoMineProjectMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_MiradoMineProjectMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_MineraTritonArgentinaMember" xlink:label="loc_F4248H746F72_mtaff_MineraTritonArgentinaMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_MineraTritonArgentinaMember" xml:lang="en-US">Minera Triton Argentina [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_MineraTritonArgentinaMember" xml:lang="en-US">Minera Triton Argentina</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_MineraTritonArgentinaMember" xml:lang="en-US">Minera Triton Argentina.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_MineraTritonArgentinaMember" xlink:to="lab_H6460J968H94_mtaff_MineraTritonArgentinaMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_GarrisonProjectNsrMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_GarrisonProjectNsrMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_GarrisonProjectNsrMember" xml:lang="en-US">Garrison Project Nsr [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_GarrisonProjectNsrMember" xml:lang="en-US">Garrison project NSR</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_GarrisonProjectNsrMember" xml:lang="en-US">Garrison project NSR.</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_mtaff_GarrisonProjectNsrMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Garrison</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_GarrisonProjectNsrMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_GarrisonProjectNsrMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_LosPlatosProjectNsrMember" xlink:label="loc_F4248H746F72_mtaff_LosPlatosProjectNsrMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_LosPlatosProjectNsrMember" xml:lang="en-US">Los Platos Project Nsr [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_LosPlatosProjectNsrMember" xml:lang="en-US">Los Platos project NSR</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_LosPlatosProjectNsrMember" xml:lang="en-US">Los Platos project NSR.</label>
<label xlink:type="resource" xlink:label="lab_H6460J968H94_mtaff_LosPlatosProjectNsrMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Los Platos</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_LosPlatosProjectNsrMember" xlink:to="lab_H6460J968H94_mtaff_LosPlatosProjectNsrMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_TowerMountainProjectMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_TowerMountainProjectMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_TowerMountainProjectMember" xml:lang="en-US">Tower Mountain Project [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_TowerMountainProjectMember" xml:lang="en-US">Tower Mountain project</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_TowerMountainProjectMember" xml:lang="en-US">Tower Mountain project.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_TowerMountainProjectMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_TowerMountainProjectMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TypesOfInvestmentPropertyAxis" xlink:label="loc_F4248H746F72_ifrs-full_TypesOfInvestmentPropertyAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_TypesOfInvestmentPropertyAxis" xml:lang="en-US">Types of investment property [axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_TypesOfInvestmentPropertyAxis" xlink:to="lab_H6460J968H94_ifrs-full_TypesOfInvestmentPropertyAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_InvestmentPropertyMember" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_InvestmentPropertyMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_InvestmentPropertyMember" xml:lang="en-US">Investment property [member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_InvestmentPropertyMember" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_InvestmentPropertyMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_JoaquinProjectMember" xlink:label="loc_F4248H746F72_mtaff_JoaquinProjectMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_JoaquinProjectMember" xml:lang="en-US">Joaquin Project [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_JoaquinProjectMember" xml:lang="en-US">Joaquin project</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_JoaquinProjectMember" xml:lang="en-US">Joaquin project.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_JoaquinProjectMember" xlink:to="lab_H6460J968H94_mtaff_JoaquinProjectMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ZarumaGoldMineMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ZarumaGoldMineMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ZarumaGoldMineMember" xml:lang="en-US">Zaruma Gold Mine [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ZarumaGoldMineMember" xml:lang="en-US">Zaruma gold mine</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ZarumaGoldMineMember" xml:lang="en-US">Zaruma gold mine.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ZarumaGoldMineMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ZarumaGoldMineMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_PuchuldizaProjectMember" xlink:label="loc_F4248H746F72_mtaff_PuchuldizaProjectMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_PuchuldizaProjectMember" xml:lang="en-US">Puchuldiza Project [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_PuchuldizaProjectMember" xml:lang="en-US">Puchuldiza project</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_PuchuldizaProjectMember" xml:lang="en-US">Puchuldiza project.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_PuchuldizaProjectMember" xlink:to="lab_H6460J968H94_mtaff_PuchuldizaProjectMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_HolyePondExtensionPropertyMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_HolyePondExtensionPropertyMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_HolyePondExtensionPropertyMember" xml:lang="en-US">Holye Pond Extension Property [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_HolyePondExtensionPropertyMember" xml:lang="en-US">Holye Pond extension property</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_HolyePondExtensionPropertyMember" xml:lang="en-US">Holye Pond extension property.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_HolyePondExtensionPropertyMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_HolyePondExtensionPropertyMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_MontclergPropertyMember" xlink:label="loc_F4248H746F72_mtaff_MontclergPropertyMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_MontclergPropertyMember" xml:lang="en-US">Montclerg Property [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_MontclergPropertyMember" xml:lang="en-US">Montclerg property</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_MontclergPropertyMember" xml:lang="en-US">Montclerg property.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_MontclergPropertyMember" xlink:to="lab_H6460J968H94_mtaff_MontclergPropertyMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_WestTimminsExtensionPropertiesMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_WestTimminsExtensionPropertiesMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WestTimminsExtensionPropertiesMember" xml:lang="en-US">West Timmins Extension Properties [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WestTimminsExtensionPropertiesMember" xml:lang="en-US">West Timmins extension properties</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WestTimminsExtensionPropertiesMember" xml:lang="en-US">West Timmins extension properties.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_WestTimminsExtensionPropertiesMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_WestTimminsExtensionPropertiesMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DesantisPropertiesMember" xlink:label="loc_F4248H746F72_mtaff_DesantisPropertiesMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_DesantisPropertiesMember" xml:lang="en-US">Desantis Properties [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_DesantisPropertiesMember" xml:lang="en-US">DeSantis properties</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_DesantisPropertiesMember" xml:lang="en-US">DeSantis properties.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_DesantisPropertiesMember" xlink:to="lab_H6460J968H94_mtaff_DesantisPropertiesMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_EitherHoylePondMineOrWestTimminsMineMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_EitherHoylePondMineOrWestTimminsMineMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_EitherHoylePondMineOrWestTimminsMineMember" xml:lang="en-US">Either Hoyle Pond Mine Or West Timmins Mine [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_EitherHoylePondMineOrWestTimminsMineMember" xml:lang="en-US">Either Hoyle Pond mine or West Timmins mine</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_EitherHoylePondMineOrWestTimminsMineMember" xml:lang="en-US">Represents either Hoyle Pond mine or West Timmins mine.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_EitherHoylePondMineOrWestTimminsMineMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_EitherHoylePondMineOrWestTimminsMineMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_CategoriesOfRoyaltyStreamsAndInterestsAxis" xlink:label="loc_F4248H746F72_mtaff_CategoriesOfRoyaltyStreamsAndInterestsAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_CategoriesOfRoyaltyStreamsAndInterestsAxis" xml:lang="en-US">Categories Of Royalty, Streams And Interests [Axis]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_CategoriesOfRoyaltyStreamsAndInterestsAxis" xml:lang="en-US">Categories of Royalty, streams and interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_CategoriesOfRoyaltyStreamsAndInterestsAxis" xlink:to="lab_H6460J968H94_mtaff_CategoriesOfRoyaltyStreamsAndInterestsAxis"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_CategoriesOfRoyaltyStreamsAndInterestsDomain" xlink:label="loc_IF21F453I7K897H8F732_mtaff_CategoriesOfRoyaltyStreamsAndInterestsDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CategoriesOfRoyaltyStreamsAndInterestsDomain" xml:lang="en-US">Categories Of Royalty, Streams And Interests [Domain]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CategoriesOfRoyaltyStreamsAndInterestsDomain" xml:lang="en-US">Categories of Royalty, streams and interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_CategoriesOfRoyaltyStreamsAndInterestsDomain" xlink:to="lab_KH43H675K9M019J0H954_mtaff_CategoriesOfRoyaltyStreamsAndInterestsDomain"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_WasamacNsrMember" xlink:label="loc_F4248H746F72_mtaff_WasamacNsrMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_WasamacNsrMember" xml:lang="en-US">Wasamac Nsr [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_WasamacNsrMember" xml:lang="en-US">Wasamac NSR</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_WasamacNsrMember" xml:lang="en-US">Wasamac NSR.</label>
<label xlink:type="resource" xlink:label="lab_H6460J968H94_mtaff_WasamacNsrMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Wasamac</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_WasamacNsrMember" xlink:to="lab_H6460J968H94_mtaff_WasamacNsrMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ElRealitoNsrMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ElRealitoNsrMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ElRealitoNsrMember" xml:lang="en-US">El Realito Nsr [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ElRealitoNsrMember" xml:lang="en-US">El Realito NSR</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ElRealitoNsrMember" xml:lang="en-US">El Realito NSR.</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ElRealitoNsrMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">El Realito</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ElRealitoNsrMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ElRealitoNsrMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_LaFortunaNsrOptionMember" xlink:label="loc_F4248H746F72_mtaff_LaFortunaNsrOptionMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_LaFortunaNsrOptionMember" xml:lang="en-US">La Fortuna Nsr Option [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_LaFortunaNsrOptionMember" xml:lang="en-US">La Fortuna NSR option</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_LaFortunaNsrOptionMember" xml:lang="en-US">La Fortuna NSR option.</label>
<label xlink:type="resource" xlink:label="lab_H6460J968H94_mtaff_LaFortunaNsrOptionMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">La Fortuna option</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_LaFortunaNsrOptionMember" xlink:to="lab_H6460J968H94_mtaff_LaFortunaNsrOptionMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsLineItems" xlink:label="loc_IF21F453I7K897H8F732_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsLineItems" xml:lang="en-US">Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsLineItems" xml:lang="en-US">Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsLineItems" xlink:to="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfRoyaltyInterestsAndDeferredAcquisitionCostsLineItems"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NetSmelterReturnAcquiredPercentage" xlink:label="loc_F4248H746F72_mtaff_NetSmelterReturnAcquiredPercentage"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_NetSmelterReturnAcquiredPercentage" xml:lang="en-US">Net Smelter Return Acquired Percentage</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_NetSmelterReturnAcquiredPercentage" xml:lang="en-US">Percentage of NSR royalty interest</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_NetSmelterReturnAcquiredPercentage" xml:lang="en-US">Net Smelter Return (NSR) acquired percentage.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_NetSmelterReturnAcquiredPercentage" xlink:to="lab_H6460J968H94_mtaff_NetSmelterReturnAcquiredPercentage"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfCommonSharesReceivedForExchangeRatio" xlink:label="loc_IF21F453I7K897H8F732_mtaff_NumberOfCommonSharesReceivedForExchangeRatio"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfCommonSharesReceivedForExchangeRatio" xml:lang="en-US">Number Of Common Shares Received For Exchange Ratio</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfCommonSharesReceivedForExchangeRatio" xml:lang="en-US">Number of common shares received for exchange ratio</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfCommonSharesReceivedForExchangeRatio" xml:lang="en-US">Represents number of common shares received for exchange ratio.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_NumberOfCommonSharesReceivedForExchangeRatio" xlink:to="lab_KH43H675K9M019J0H954_mtaff_NumberOfCommonSharesReceivedForExchangeRatio"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_PurchasePriceOfAcquisitionPaidInCash" xlink:label="loc_F4248H746F72_mtaff_PurchasePriceOfAcquisitionPaidInCash"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_PurchasePriceOfAcquisitionPaidInCash" xml:lang="en-US">Purchase Price Of Acquisition Paid In Cash</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_PurchasePriceOfAcquisitionPaidInCash" xml:lang="en-US">Purchase price of acquisition paid in cash</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_PurchasePriceOfAcquisitionPaidInCash" xml:lang="en-US">It represents purchase price of acquisition paid in cash.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_PurchasePriceOfAcquisitionPaidInCash" xlink:to="lab_H6460J968H94_mtaff_PurchasePriceOfAcquisitionPaidInCash"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExemptionOnGoldProduced" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ExemptionOnGoldProduced"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExemptionOnGoldProduced" xml:lang="en-US">Exemption On Gold Produced</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExemptionOnGoldProduced" xml:lang="en-US">Exemption on gold produced</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExemptionOnGoldProduced" xml:lang="en-US">Exemption on gold produced.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ExemptionOnGoldProduced" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ExemptionOnGoldProduced"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_BuyBackRightPercentage" xlink:label="loc_F4248H746F72_mtaff_BuyBackRightPercentage"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_BuyBackRightPercentage" xml:lang="en-US">Buy Back Right Percentage</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_BuyBackRightPercentage" xml:lang="en-US">Buy-back right percentage</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_BuyBackRightPercentage" xml:lang="en-US">Percentage for buy-back right.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_BuyBackRightPercentage" xlink:to="lab_H6460J968H94_mtaff_BuyBackRightPercentage"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_RightToBuyBackStreamAmount" xlink:label="loc_IF21F453I7K897H8F732_mtaff_RightToBuyBackStreamAmount"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RightToBuyBackStreamAmount" xml:lang="en-US">Right To Buy Back Stream Amount</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RightToBuyBackStreamAmount" xml:lang="en-US">Right to buy-back stream, amount</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RightToBuyBackStreamAmount" xml:lang="en-US">Right to buy-back stream amount.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_RightToBuyBackStreamAmount" xlink:to="lab_KH43H675K9M019J0H954_mtaff_RightToBuyBackStreamAmount"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfRoyaltyInterest" xlink:label="loc_F4248H746F72_mtaff_NumberOfRoyaltyInterest"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_NumberOfRoyaltyInterest" xml:lang="en-US">Number Of Royalty Interest</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_NumberOfRoyaltyInterest" xml:lang="en-US">Number of royalty interest acquired</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_NumberOfRoyaltyInterest" xml:lang="en-US">Number of royalty interest.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_NumberOfRoyaltyInterest" xlink:to="lab_H6460J968H94_mtaff_NumberOfRoyaltyInterest"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfSilverStreamInterests" xlink:label="loc_IF21F453I7K897H8F732_mtaff_NumberOfSilverStreamInterests"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfSilverStreamInterests" xml:lang="en-US">Number Of Silver Stream Interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfSilverStreamInterests" xml:lang="en-US">Number of silver stream interests acquired</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfSilverStreamInterests" xml:lang="en-US">Number of silver stream interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_NumberOfSilverStreamInterests" xlink:to="lab_KH43H675K9M019J0H954_mtaff_NumberOfSilverStreamInterests"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_SharePricePerShare" xlink:label="loc_F4248H746F72_mtaff_SharePricePerShare"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_SharePricePerShare" xml:lang="en-US">Share Price Per Share</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_SharePricePerShare" xml:lang="en-US">Share price per share</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_SharePricePerShare" xml:lang="en-US">Share price per share.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_SharePricePerShare" xlink:to="lab_H6460J968H94_mtaff_SharePricePerShare"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ConvertibleDebenturePayable" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ConvertibleDebenturePayable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ConvertibleDebenturePayable" xml:lang="en-US">Convertible Debenture Payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ConvertibleDebenturePayable" xml:lang="en-US">Convertible debenture</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ConvertibleDebenturePayable" xml:lang="en-US">Convertible debenture payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ConvertibleDebenturePayable" xml:lang="en-US">Convertible debenture payable.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ConvertibleDebenturePayable" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ConvertibleDebenturePayable"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NetSmelterReturn" xlink:label="loc_F4248H746F72_mtaff_NetSmelterReturn"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_NetSmelterReturn" xml:lang="en-US">Net Smelter Return</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_NetSmelterReturn" xml:lang="en-US">Net smelter return</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_NetSmelterReturn" xml:lang="en-US">Net Smelter Return.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_NetSmelterReturn" xlink:to="lab_H6460J968H94_mtaff_NetSmelterReturn"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_RoyaltyInterestsAndDeferredAcquisitionCosts" xlink:label="loc_IF21F453I7K897H8F732_mtaff_RoyaltyInterestsAndDeferredAcquisitionCosts"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RoyaltyInterestsAndDeferredAcquisitionCosts" xml:lang="en-US">Royalty Interests And Deferred Acquisition Costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RoyaltyInterestsAndDeferredAcquisitionCosts" xml:lang="en-US">ValGold royalty interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RoyaltyInterestsAndDeferredAcquisitionCosts" xml:lang="en-US">Royalty interests and deferred acquisition costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RoyaltyInterestsAndDeferredAcquisitionCosts" xml:lang="en-US">Royalty Interests And Deferred Acquisition Costs.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_RoyaltyInterestsAndDeferredAcquisitionCosts" xlink:to="lab_KH43H675K9M019J0H954_mtaff_RoyaltyInterestsAndDeferredAcquisitionCosts"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_OperatingCostContributionPricePerOunce" xlink:label="loc_F4248H746F72_mtaff_OperatingCostContributionPricePerOunce"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_OperatingCostContributionPricePerOunce" xml:lang="en-US">Operating Cost Contribution Price Per Ounce</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_OperatingCostContributionPricePerOunce" xml:lang="en-US">Operating cost contribution price per ounce</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_OperatingCostContributionPricePerOunce" xml:lang="en-US">Operating cost contribution price per ounce.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_OperatingCostContributionPricePerOunce" xlink:to="lab_H6460J968H94_mtaff_OperatingCostContributionPricePerOunce"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_PercentageIncrementsOfExceededSilverPricePerOunce" xlink:label="loc_IF21F453I7K897H8F732_mtaff_PercentageIncrementsOfExceededSilverPricePerOunce"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PercentageIncrementsOfExceededSilverPricePerOunce" xml:lang="en-US">Percentage Increments Of Exceeded Silver Price Per Ounce</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PercentageIncrementsOfExceededSilverPricePerOunce" xml:lang="en-US">Incremental percentage of exceeded silver price per ounce</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PercentageIncrementsOfExceededSilverPricePerOunce" xml:lang="en-US">Incremental percentage of exceeded silver price per ounce.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_PercentageIncrementsOfExceededSilverPricePerOunce" xlink:to="lab_KH43H675K9M019J0H954_mtaff_PercentageIncrementsOfExceededSilverPricePerOunce"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_PercentageRightToBuySilverProduction" xlink:label="loc_F4248H746F72_mtaff_PercentageRightToBuySilverProduction"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_PercentageRightToBuySilverProduction" xml:lang="en-US">Percentage Right To Buy Silver Production</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_PercentageRightToBuySilverProduction" xml:lang="en-US">Percentage right to buy silver pruduction</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_PercentageRightToBuySilverProduction" xml:lang="en-US">Percentage right to buy silver pruduction.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_PercentageRightToBuySilverProduction" xlink:to="lab_H6460J968H94_mtaff_PercentageRightToBuySilverProduction"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExceedingSilverPricePerOunce" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ExceedingSilverPricePerOunce"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExceedingSilverPricePerOunce" xml:lang="en-US">Exceeding Silver Price Per Ounce</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExceedingSilverPricePerOunce" xml:lang="en-US">Exceeding silver price per ounce</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExceedingSilverPricePerOunce" xml:lang="en-US">Exceeding silver price per ounce.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ExceedingSilverPricePerOunce" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ExceedingSilverPricePerOunce"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_RightToBuySilverProduction" xlink:label="loc_F4248H746F72_mtaff_RightToBuySilverProduction"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_RightToBuySilverProduction" xml:lang="en-US">Right To Buy Silver Production</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_RightToBuySilverProduction" xml:lang="en-US">Right to buy silver production</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_RightToBuySilverProduction" xml:lang="en-US">Right to buy silver production.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_RightToBuySilverProduction" xlink:to="lab_H6460J968H94_mtaff_RightToBuySilverProduction"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_RightToDeliverSilverProductionOuncesDelivered" xlink:label="loc_IF21F453I7K897H8F732_mtaff_RightToDeliverSilverProductionOuncesDelivered"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RightToDeliverSilverProductionOuncesDelivered" xml:lang="en-US">Right To Deliver Silver Production Ounces Delivered</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RightToDeliverSilverProductionOuncesDelivered" xml:lang="en-US">Right to deliver silver production, ounces delivered</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RightToDeliverSilverProductionOuncesDelivered" xml:lang="en-US">Right to deliver silver production, ounces delivered.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_RightToDeliverSilverProductionOuncesDelivered" xlink:to="lab_KH43H675K9M019J0H954_mtaff_RightToDeliverSilverProductionOuncesDelivered"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_RightToDeliverSilverProductionOuncesRemainingToBeDelivered" xlink:label="loc_F4248H746F72_mtaff_RightToDeliverSilverProductionOuncesRemainingToBeDelivered"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_RightToDeliverSilverProductionOuncesRemainingToBeDelivered" xml:lang="en-US">Right To Deliver Silver Production Ounces Remaining To Be Delivered</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_RightToDeliverSilverProductionOuncesRemainingToBeDelivered" xml:lang="en-US">Right to deliver silver production, ounces remaining to be delivered</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_RightToDeliverSilverProductionOuncesRemainingToBeDelivered" xml:lang="en-US">Right to deliver silver production, ounces remaining to be delivered.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_RightToDeliverSilverProductionOuncesRemainingToBeDelivered" xlink:to="lab_H6460J968H94_mtaff_RightToDeliverSilverProductionOuncesRemainingToBeDelivered"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_EstimatedDeliveryOfPayableSilver" xlink:label="loc_IF21F453I7K897H8F732_mtaff_EstimatedDeliveryOfPayableSilver"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_EstimatedDeliveryOfPayableSilver" xml:lang="en-US">Estimated Delivery Of Payable Silver</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_EstimatedDeliveryOfPayableSilver" xml:lang="en-US">Estimated delivery of payable silver</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_EstimatedDeliveryOfPayableSilver" xml:lang="en-US">Estimated delivery of payable silver.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_EstimatedDeliveryOfPayableSilver" xlink:to="lab_KH43H675K9M019J0H954_mtaff_EstimatedDeliveryOfPayableSilver"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AdditionalNetSmelterReturnPercentage" xlink:label="loc_F4248H746F72_mtaff_AdditionalNetSmelterReturnPercentage"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_AdditionalNetSmelterReturnPercentage" xml:lang="en-US">Additional Net Smelter Return Percentage</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_AdditionalNetSmelterReturnPercentage" xml:lang="en-US">Additional net smelter return</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_AdditionalNetSmelterReturnPercentage" xml:lang="en-US">Additional net smelter return percentage.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_AdditionalNetSmelterReturnPercentage" xlink:to="lab_H6460J968H94_mtaff_AdditionalNetSmelterReturnPercentage"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_WeightedAverageExercisePriceOfWarrantsIssued" xlink:label="loc_IF21F453I7K897H8F732_mtaff_WeightedAverageExercisePriceOfWarrantsIssued"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WeightedAverageExercisePriceOfWarrantsIssued" xml:lang="en-US">Weighted Average Exercise Price Of Warrants Issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WeightedAverageExercisePriceOfWarrantsIssued" xml:lang="en-US">Weighted average exercise price of warrants, Issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WeightedAverageExercisePriceOfWarrantsIssued" xml:lang="en-US">It represents as a amount of warrants issued.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_WeightedAverageExercisePriceOfWarrantsIssued" xlink:to="lab_KH43H675K9M019J0H954_mtaff_WeightedAverageExercisePriceOfWarrantsIssued"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_SharePurchaseWarrantExercisePriceTerm" xlink:label="loc_F4248H746F72_mtaff_SharePurchaseWarrantExercisePriceTerm"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_SharePurchaseWarrantExercisePriceTerm" xml:lang="en-US">Share Purchase Warrant Exercise Price Term</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_SharePurchaseWarrantExercisePriceTerm" xml:lang="en-US">Term of share purchase warrant exercise price</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_SharePurchaseWarrantExercisePriceTerm" xml:lang="en-US">Term of share purchase warrant exercise price.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_SharePurchaseWarrantExercisePriceTerm" xlink:to="lab_H6460J968H94_mtaff_SharePurchaseWarrantExercisePriceTerm"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AcquisitionCostsForRoyaltyInterests" xlink:label="loc_IF21F453I7K897H8F732_mtaff_AcquisitionCostsForRoyaltyInterests"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_AcquisitionCostsForRoyaltyInterests" xml:lang="en-US">Acquisition Costs For Royalty Interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_AcquisitionCostsForRoyaltyInterests" xml:lang="en-US">Acquisition costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_AcquisitionCostsForRoyaltyInterests" xml:lang="en-US">Acquisition costs for royalty interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_AcquisitionCostsForRoyaltyInterests" xlink:to="lab_KH43H675K9M019J0H954_mtaff_AcquisitionCostsForRoyaltyInterests"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_PurchasePriceForAdditionalNetSmelterRoyalty" xlink:label="loc_F4248H746F72_mtaff_PurchasePriceForAdditionalNetSmelterRoyalty"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_PurchasePriceForAdditionalNetSmelterRoyalty" xml:lang="en-US">Purchase Price For Additional Net Smelter Royalty</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_PurchasePriceForAdditionalNetSmelterRoyalty" xml:lang="en-US">Purchase price for additional net smelter royalty</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_PurchasePriceForAdditionalNetSmelterRoyalty" xml:lang="en-US">Purchase price for additional net smelter royalty.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_PurchasePriceForAdditionalNetSmelterRoyalty" xlink:to="lab_H6460J968H94_mtaff_PurchasePriceForAdditionalNetSmelterRoyalty"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfNsrInterestsAcquired" xlink:label="loc_IF21F453I7K897H8F732_mtaff_NumberOfNsrInterestsAcquired"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfNsrInterestsAcquired" xml:lang="en-US">Number Of Nsr Interests Acquired</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfNsrInterestsAcquired" xml:lang="en-US">Number NSR interests acquired</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfNsrInterestsAcquired" xml:lang="en-US">Number of NSR interests acquired.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_NumberOfNsrInterestsAcquired" xlink:to="lab_KH43H675K9M019J0H954_mtaff_NumberOfNsrInterestsAcquired"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_SharePurchaseWarrantsIssued" xlink:label="loc_F4248H746F72_mtaff_SharePurchaseWarrantsIssued"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_SharePurchaseWarrantsIssued" xml:lang="en-US">Share Purchase Warrants Issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_SharePurchaseWarrantsIssued" xml:lang="en-US">Share purchase warrants issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_SharePurchaseWarrantsIssued" xml:lang="en-US">Share purchase warrants issued.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_SharePurchaseWarrantsIssued" xlink:to="lab_H6460J968H94_mtaff_SharePurchaseWarrantsIssued"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ValueOfSharePurchaseWarrantsIssued" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ValueOfSharePurchaseWarrantsIssued"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ValueOfSharePurchaseWarrantsIssued" xml:lang="en-US">Value Of Share Purchase Warrants Issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ValueOfSharePurchaseWarrantsIssued" xml:lang="en-US">Value of share purchase warrants issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ValueOfSharePurchaseWarrantsIssued" xml:lang="en-US">Value of share purchase warrants issued.</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ValueOfSharePurchaseWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Fair value at measurement date, warrants issued</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ValueOfSharePurchaseWarrantsIssued" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ValueOfSharePurchaseWarrantsIssued"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NetSmelterReturnAcquisitionRange" xlink:label="loc_F4248H746F72_mtaff_NetSmelterReturnAcquisitionRange"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_NetSmelterReturnAcquisitionRange" xml:lang="en-US">Net Smelter Return Acquisition Range</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_NetSmelterReturnAcquisitionRange" xml:lang="en-US">Net smelter return acquisition range, Description</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_NetSmelterReturnAcquisitionRange" xml:lang="en-US">Description of Net smelter (NSR) acquisition rage.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_NetSmelterReturnAcquisitionRange" xlink:to="lab_H6460J968H94_mtaff_NetSmelterReturnAcquisitionRange"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_MaximumCappingOfUnsecuredNetSmelterReturnNsr" xlink:label="loc_IF21F453I7K897H8F732_mtaff_MaximumCappingOfUnsecuredNetSmelterReturnNsr"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_MaximumCappingOfUnsecuredNetSmelterReturnNsr" xml:lang="en-US">Maximum Capping Of Unsecured Net Smelter Return (Nsr)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_MaximumCappingOfUnsecuredNetSmelterReturnNsr" xml:lang="en-US">Maximum capping of unsecured NSR</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_MaximumCappingOfUnsecuredNetSmelterReturnNsr" xml:lang="en-US">Represents maximum amount of capping of unsecured NSR.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_MaximumCappingOfUnsecuredNetSmelterReturnNsr" xlink:to="lab_KH43H675K9M019J0H954_mtaff_MaximumCappingOfUnsecuredNetSmelterReturnNsr"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_MaximumCappingOfNetSmelterReturnNsr" xlink:label="loc_F4248H746F72_mtaff_MaximumCappingOfNetSmelterReturnNsr"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_MaximumCappingOfNetSmelterReturnNsr" xml:lang="en-US">Maximum Capping Of Net Smelter Return (Nsr)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_MaximumCappingOfNetSmelterReturnNsr" xml:lang="en-US">Maximum capping of NSR</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_MaximumCappingOfNetSmelterReturnNsr" xml:lang="en-US">Represents maximum amount of capping of NSR (NSR).</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_MaximumCappingOfNetSmelterReturnNsr" xlink:to="lab_H6460J968H94_mtaff_MaximumCappingOfNetSmelterReturnNsr"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_PurchasePriceOfAgreement" xlink:label="loc_IF21F453I7K897H8F732_mtaff_PurchasePriceOfAgreement"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PurchasePriceOfAgreement" xml:lang="en-US">Purchase Price Of Agreement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PurchasePriceOfAgreement" xml:lang="en-US">Purchase price of agreement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PurchasePriceOfAgreement" xml:lang="en-US">Represents amount of purchase price of agreement.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_PurchasePriceOfAgreement" xlink:to="lab_KH43H675K9M019J0H954_mtaff_PurchasePriceOfAgreement"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement" xlink:label="loc_F4248H746F72_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement" xml:lang="en-US">Number of share options granted in share-based payment arrangement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement" xml:lang="en-US">Stock options granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement" xml:lang="en-US">Granted</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement" xlink:to="lab_H6460J968H94_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_PurchasePriceOfAgreementPayableInShares" xlink:label="loc_IF21F453I7K897H8F732_mtaff_PurchasePriceOfAgreementPayableInShares"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PurchasePriceOfAgreementPayableInShares" xml:lang="en-US">Purchase Price Of Agreement Payable In Shares</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PurchasePriceOfAgreementPayableInShares" xml:lang="en-US">Purchase price of agreement payable in shares</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PurchasePriceOfAgreementPayableInShares" xml:lang="en-US">Represents purchase price of agreement payable in share.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_PurchasePriceOfAgreementPayableInShares" xlink:to="lab_KH43H675K9M019J0H954_mtaff_PurchasePriceOfAgreementPayableInShares"/>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_TermOfExerciseOfOption" xlink:label="loc_IF21F453I7K897H8F732_mtaff_TermOfExerciseOfOption"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_TermOfExerciseOfOption" xml:lang="en-US">Term Of Exercise Of Option</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_TermOfExerciseOfOption" xml:lang="en-US">Represents the term of excerise of option.</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_mtaff_TermOfExerciseOfOption" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Term of exercise of option</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_TermOfExerciseOfOption" xlink:to="lab_KH43H675K9M019J0H954_mtaff_TermOfExerciseOfOption"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:label="loc_F4248H746F72_ifrs-full_ProportionOfOwnershipInterestInSubsidiary"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xml:lang="en-US">Percentage of ownership interest in subsidiary</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xml:lang="en-US">Percentage of ownership interest in subsidiary</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:to="lab_H6460J968H94_ifrs-full_ProportionOfOwnershipInterestInSubsidiary"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_SharePurchaseWarrantOutstandingExercisableAcquisition" xlink:label="loc_IF21F453I7K897H8F732_mtaff_SharePurchaseWarrantOutstandingExercisableAcquisition"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_SharePurchaseWarrantOutstandingExercisableAcquisition" xml:lang="en-US">Share Purchase Warrant Outstanding Exercisable Acquisition</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_SharePurchaseWarrantOutstandingExercisableAcquisition" xml:lang="en-US">Share purchase warrant outstanding exercisable acquisition</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_SharePurchaseWarrantOutstandingExercisableAcquisition" xml:lang="en-US">It reprensets share purchase warrant outstanding exercisable acquisition.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_SharePurchaseWarrantOutstandingExercisableAcquisition" xlink:to="lab_KH43H675K9M019J0H954_mtaff_SharePurchaseWarrantOutstandingExercisableAcquisition"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_PricePerSharePurchaseWarrantOutstandingExercisableAcquisition" xlink:label="loc_F4248H746F72_mtaff_PricePerSharePurchaseWarrantOutstandingExercisableAcquisition"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_PricePerSharePurchaseWarrantOutstandingExercisableAcquisition" xml:lang="en-US">Price Per Share Purchase Warrant Outstanding Exercisable Acquisition</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_PricePerSharePurchaseWarrantOutstandingExercisableAcquisition" xml:lang="en-US">Exercise price per share purchase warrant outstanding exercisable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_PricePerSharePurchaseWarrantOutstandingExercisableAcquisition" xml:lang="en-US">It represents share purchase warrant outstanding exercisable acquisition.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_PricePerSharePurchaseWarrantOutstandingExercisableAcquisition" xlink:to="lab_H6460J968H94_mtaff_PricePerSharePurchaseWarrantOutstandingExercisableAcquisition"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_FairValueAtMeasurementDateShareOptionsGranted" xlink:label="loc_IF21F453I7K897H8F732_mtaff_FairValueAtMeasurementDateShareOptionsGranted"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FairValueAtMeasurementDateShareOptionsGranted" xml:lang="en-US">Fair Value At Measurement Date Share Options Granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FairValueAtMeasurementDateShareOptionsGranted" xml:lang="en-US">Fair value at measurement date, share options granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FairValueAtMeasurementDateShareOptionsGranted" xml:lang="en-US">Fair value at measurement date, share options granted.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_FairValueAtMeasurementDateShareOptionsGranted" xlink:to="lab_KH43H675K9M019J0H954_mtaff_FairValueAtMeasurementDateShareOptionsGranted"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted" xlink:label="loc_F4248H746F72_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted" xml:lang="en-US">Weighted average fair value at measurement date, share options granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted" xml:lang="en-US">Weighted average price per options granted</label>
<label xlink:type="resource" xlink:label="lab_H6460J968H94_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Weighted average fair value per option granted</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted" xlink:to="lab_H6460J968H94_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted" xml:lang="en-US">Risk free interest rate, share options granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted" xml:lang="en-US">Risk free interest rate</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted" xlink:label="loc_F4248H746F72_ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted" xml:lang="en-US">Expected dividend as percentage, share options granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted" xml:lang="en-US">Expected dividend yield</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted" xlink:to="lab_H6460J968H94_ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted" xml:lang="en-US">Expected volatility, share options granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted" xml:lang="en-US">Expected stock price volatility</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DescriptionOfOptionLifeShareOptionsGranted" xlink:label="loc_F4248H746F72_ifrs-full_DescriptionOfOptionLifeShareOptionsGranted"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DescriptionOfOptionLifeShareOptionsGranted" xml:lang="en-US">Option life, share options granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_DescriptionOfOptionLifeShareOptionsGranted" xml:lang="en-US">Expected life in years</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DescriptionOfOptionLifeShareOptionsGranted" xlink:to="lab_H6460J968H94_ifrs-full_DescriptionOfOptionLifeShareOptionsGranted"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ShareOptionForfeitureRate" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ShareOptionForfeitureRate"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ShareOptionForfeitureRate" xml:lang="en-US">Share Option Forfeiture Rate</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ShareOptionForfeitureRate" xml:lang="en-US">Forfeiture rate</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ShareOptionForfeitureRate" xml:lang="en-US">The percentage of forfeiture rate.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ShareOptionForfeitureRate" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ShareOptionForfeitureRate"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfInferredResourceInOunces" xlink:label="loc_F4248H746F72_mtaff_NumberOfInferredResourceInOunces"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_NumberOfInferredResourceInOunces" xml:lang="en-US">Number Of Inferred Resource In Ounces</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_NumberOfInferredResourceInOunces" xml:lang="en-US">Number of inferred resource (in Ounces)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_NumberOfInferredResourceInOunces" xml:lang="en-US">It represents number of inferred resource in ounces.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_NumberOfInferredResourceInOunces" xlink:to="lab_H6460J968H94_mtaff_NumberOfInferredResourceInOunces"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfBulkTonnageModel" xlink:label="loc_IF21F453I7K897H8F732_mtaff_NumberOfBulkTonnageModel"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfBulkTonnageModel" xml:lang="en-US">Number Of Bulk Tonnage Model</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfBulkTonnageModel" xml:lang="en-US">Number of bulk tonnage model (in tonnes)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfBulkTonnageModel" xml:lang="en-US">It represents number of bulk tonnage model.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_NumberOfBulkTonnageModel" xlink:to="lab_KH43H675K9M019J0H954_mtaff_NumberOfBulkTonnageModel"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AverageGradeOfGoldGramPerTonne" xlink:label="loc_F4248H746F72_mtaff_AverageGradeOfGoldGramPerTonne"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_AverageGradeOfGoldGramPerTonne" xml:lang="en-US">Average Grade Of Gold Gram Per Tonne</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_AverageGradeOfGoldGramPerTonne" xml:lang="en-US">Average grade of gold (in gram per tonne)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_AverageGradeOfGoldGramPerTonne" xml:lang="en-US">It represents average grade of gold gram per tonne.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_AverageGradeOfGoldGramPerTonne" xlink:to="lab_H6460J968H94_mtaff_AverageGradeOfGoldGramPerTonne"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_SaleOfAcquisitionToOriginalOwner" xlink:label="loc_IF21F453I7K897H8F732_mtaff_SaleOfAcquisitionToOriginalOwner"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_SaleOfAcquisitionToOriginalOwner" xml:lang="en-US">Sale Of Acquisition To Original Owner</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_SaleOfAcquisitionToOriginalOwner" xml:lang="en-US">Sale of acquisition to original owner</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_SaleOfAcquisitionToOriginalOwner" xml:lang="en-US">It represents sale of acquisition to original owner.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_SaleOfAcquisitionToOriginalOwner" xlink:to="lab_KH43H675K9M019J0H954_mtaff_SaleOfAcquisitionToOriginalOwner"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable" xml:lang="en-US">Disclosure of subsidiaries [table]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable" xlink:to="lab_H6460J968H94_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_SignificantInvestmentsInSubsidiariesAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xml:lang="en-US">Subsidiaries [axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_SignificantInvestmentsInSubsidiariesAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_EntitysTotalForSubsidiariesMember" xlink:label="loc_F4248H746F72_ifrs-full_EntitysTotalForSubsidiariesMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_EntitysTotalForSubsidiariesMember" xml:lang="en-US">Entity's total for subsidiaries [member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_EntitysTotalForSubsidiariesMember" xlink:to="lab_H6460J968H94_ifrs-full_EntitysTotalForSubsidiariesMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_SubsidiariesMember" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_SubsidiariesMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_SubsidiariesMember" xml:lang="en-US">Subsidiaries [member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_SubsidiariesMember" xml:lang="en-US">Silverback Ltd. ("Silverback")</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_SubsidiariesMember" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_SubsidiariesMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems" xml:lang="en-US">Disclosure of associates [line items]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems" xlink:to="lab_H6460J968H94_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ConsiderationPaidReceived" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_ConsiderationPaidReceived"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ConsiderationPaidReceived" xml:lang="en-US">Consideration paid (received)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ConsiderationPaidReceived" xml:lang="en-US">Considerations paid</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ConsiderationPaidReceived" xml:lang="en-US">Considerations paid</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_ConsiderationPaidReceived" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_ConsiderationPaidReceived"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DisclosureOfLoansPayableTable" xlink:label="loc_F4248H746F72_mtaff_DisclosureOfLoansPayableTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_DisclosureOfLoansPayableTable" xml:lang="en-US">Disclosure Of Loans Payable [Table]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_DisclosureOfLoansPayableTable" xlink:to="lab_H6460J968H94_mtaff_DisclosureOfLoansPayableTable"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_TypeOfArrangementsAxis" xlink:label="loc_IF21F453I7K897H8F732_mtaff_TypeOfArrangementsAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_TypeOfArrangementsAxis" xml:lang="en-US">Type Of Arrangements [Axis]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_TypeOfArrangementsAxis" xml:lang="en-US">Information by category of arrangement, including but not limited to collaborative arrangements and non-collaborative arrangements.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_TypeOfArrangementsAxis" xlink:to="lab_KH43H675K9M019J0H954_mtaff_TypeOfArrangementsAxis"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_TypeOfArrangementsDomain" xlink:label="loc_F4248H746F72_mtaff_TypeOfArrangementsDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_TypeOfArrangementsDomain" xml:lang="en-US">Type Of Arrangements [Domain]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_TypeOfArrangementsDomain" xml:lang="en-US">This item is to be populated with the collective of (i) types (categories) of arrangements of the entity applicable to its revenue-generating activities or operations and non-arrangement transactions, including but not limited to, for instance, sales of product manufactured by the entity, if such comparison of arrangements as a component of all transactions is provided by the entity.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_TypeOfArrangementsDomain" xlink:to="lab_H6460J968H94_mtaff_TypeOfArrangementsDomain"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_LoanAgreementsWithLendersMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_LoanAgreementsWithLendersMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_LoanAgreementsWithLendersMember" xml:lang="en-US">Loan Agreements With Lenders [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_LoanAgreementsWithLendersMember" xml:lang="en-US">Four loan arrangements</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_LoanAgreementsWithLendersMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_LoanAgreementsWithLendersMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ConvertibleLoanFacilityMember" xlink:label="loc_F4248H746F72_mtaff_ConvertibleLoanFacilityMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ConvertibleLoanFacilityMember" xml:lang="en-US">Convertible Loan Facility [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_ConvertibleLoanFacilityMember" xml:lang="en-US">Convertible Loan Facility</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ConvertibleLoanFacilityMember" xml:lang="en-US">Represents information of convertible loan facility.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ConvertibleLoanFacilityMember" xlink:to="lab_H6460J968H94_mtaff_ConvertibleLoanFacilityMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_RangeAxis" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_RangeAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_RangeAxis" xml:lang="en-US">Range [axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_RangeAxis" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_RangeAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_RangesMember" xlink:label="loc_F4248H746F72_ifrs-full_RangesMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_RangesMember" xml:lang="en-US">Ranges [member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_RangesMember" xlink:to="lab_H6460J968H94_ifrs-full_RangesMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_BottomOfRangeMember" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_BottomOfRangeMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_BottomOfRangeMember" xml:lang="en-US">Bottom of range [member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_BottomOfRangeMember" xml:lang="en-US">Minimum</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_BottomOfRangeMember" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_BottomOfRangeMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TopOfRangeMember" xlink:label="loc_F4248H746F72_ifrs-full_TopOfRangeMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_TopOfRangeMember" xml:lang="en-US">Top of range [member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_TopOfRangeMember" xml:lang="en-US">Maximum</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_TopOfRangeMember" xlink:to="lab_H6460J968H94_ifrs-full_TopOfRangeMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_InflectionCapitalIncMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_InflectionCapitalIncMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_InflectionCapitalIncMember" xml:lang="en-US">Inflection Capital Inc [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_InflectionCapitalIncMember" xml:lang="en-US">Inflection Capital Inc.</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_InflectionCapitalIncMember" xml:lang="en-US">Inflection Capital Inc</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_InflectionCapitalIncMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_InflectionCapitalIncMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis" xlink:label="loc_F4248H746F72_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis" xml:lang="en-US">Non-adjusting events after reporting period [axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis" xlink:to="lab_H6460J968H94_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_NonadjustingEventsMember" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_NonadjustingEventsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_NonadjustingEventsMember" xml:lang="en-US">Non-adjusting events after reporting period [member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_NonadjustingEventsMember" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_NonadjustingEventsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_EventsAfterReportingPeriodMember" xlink:label="loc_F4248H746F72_mtaff_EventsAfterReportingPeriodMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_EventsAfterReportingPeriodMember" xml:lang="en-US">Events After Reporting Period [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_EventsAfterReportingPeriodMember" xml:lang="en-US">EVENTS AFTER THE REPORTING DATE</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_EventsAfterReportingPeriodMember" xml:lang="en-US">This member stand for events after reporting period.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_EventsAfterReportingPeriodMember" xlink:to="lab_H6460J968H94_mtaff_EventsAfterReportingPeriodMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DisclosureOfLoansPayableLineItems" xlink:label="loc_IF21F453I7K897H8F732_mtaff_DisclosureOfLoansPayableLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfLoansPayableLineItems" xml:lang="en-US">Disclosure Of Loans Payable [Line Items]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfLoansPayableLineItems" xml:lang="en-US">Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_DisclosureOfLoansPayableLineItems" xlink:to="lab_KH43H675K9M019J0H954_mtaff_DisclosureOfLoansPayableLineItems"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ProceedsFromCurrentBorrowings" xlink:label="loc_F4248H746F72_ifrs-full_ProceedsFromCurrentBorrowings"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_ProceedsFromCurrentBorrowings" xml:lang="en-US">Proceeds from current borrowings</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_ProceedsFromCurrentBorrowings" xml:lang="en-US">Proceeds from loan arrangements</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_ProceedsFromCurrentBorrowings" xlink:to="lab_H6460J968H94_ifrs-full_ProceedsFromCurrentBorrowings"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_BorrowingsInterestRate" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_BorrowingsInterestRate"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_BorrowingsInterestRate" xml:lang="en-US">Borrowings, interest rate</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_BorrowingsInterestRate" xml:lang="en-US">Stated rate percentage</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_BorrowingsInterestRate" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_BorrowingsInterestRate"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AggregateOriginationDiscount" xlink:label="loc_F4248H746F72_mtaff_AggregateOriginationDiscount"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_AggregateOriginationDiscount" xml:lang="en-US">Aggregate Origination Discount</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_AggregateOriginationDiscount" xml:lang="en-US">Aggregate origination discount</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_AggregateOriginationDiscount" xml:lang="en-US">Represents amount of aggregate origination discount.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_AggregateOriginationDiscount" xlink:to="lab_H6460J968H94_mtaff_AggregateOriginationDiscount"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_PercentageOfEquityOwnershipOtherCompanyNeedsToMaintainInOrderForAutomaticConversionToApply" xlink:label="loc_IF21F453I7K897H8F732_mtaff_PercentageOfEquityOwnershipOtherCompanyNeedsToMaintainInOrderForAutomaticConversionToApply"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PercentageOfEquityOwnershipOtherCompanyNeedsToMaintainInOrderForAutomaticConversionToApply" xml:lang="en-US">Percentage Of Equity Ownership Other Company Needs To Maintain In Order For Automatic Conversion To Apply</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PercentageOfEquityOwnershipOtherCompanyNeedsToMaintainInOrderForAutomaticConversionToApply" xml:lang="en-US">Percentage of equity ownership other company needs to maintain in order for automatic conversion to apply</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PercentageOfEquityOwnershipOtherCompanyNeedsToMaintainInOrderForAutomaticConversionToApply" xml:lang="en-US">Represents percentage of equity ownership other company needs to maintain in order for automatic conversion to apply.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_PercentageOfEquityOwnershipOtherCompanyNeedsToMaintainInOrderForAutomaticConversionToApply" xlink:to="lab_KH43H675K9M019J0H954_mtaff_PercentageOfEquityOwnershipOtherCompanyNeedsToMaintainInOrderForAutomaticConversionToApply"/>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_LoanAgreementsForAggregateAmount" xlink:label="loc_IF21F453I7K897H8F732_mtaff_LoanAgreementsForAggregateAmount"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_LoanAgreementsForAggregateAmount" xml:lang="en-US">Loan Agreements For Aggregate Amount</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_LoanAgreementsForAggregateAmount" xml:lang="en-US">Loan agreements aggregate amount</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_LoanAgreementsForAggregateAmount" xml:lang="en-US">Represents amount of aggregate loan agreements.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_LoanAgreementsForAggregateAmount" xlink:to="lab_KH43H675K9M019J0H954_mtaff_LoanAgreementsForAggregateAmount"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_SecuredLoanAgreementsAggregateAmount" xlink:label="loc_F4248H746F72_mtaff_SecuredLoanAgreementsAggregateAmount"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_SecuredLoanAgreementsAggregateAmount" xml:lang="en-US">Secured Loan Agreements Aggregate Amount</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_SecuredLoanAgreementsAggregateAmount" xml:lang="en-US">Secured loan agreements aggregate amount</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_SecuredLoanAgreementsAggregateAmount" xml:lang="en-US">Represents secured aggregate loan amount.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_SecuredLoanAgreementsAggregateAmount" xlink:to="lab_H6460J968H94_mtaff_SecuredLoanAgreementsAggregateAmount"/>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ContingentPaymentForConsiderationForLoanAgreement" xlink:label="loc_F4248H746F72_mtaff_ContingentPaymentForConsiderationForLoanAgreement"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ContingentPaymentForConsiderationForLoanAgreement" xml:lang="en-US">Contingent Payment For Consideration For Loan Agreement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_ContingentPaymentForConsiderationForLoanAgreement" xml:lang="en-US">Contingent payment for consideration for loan agreement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ContingentPaymentForConsiderationForLoanAgreement" xml:lang="en-US">Represents amount of contingent payment for consideration for loan agreement.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ContingentPaymentForConsiderationForLoanAgreement" xlink:to="lab_H6460J968H94_mtaff_ContingentPaymentForConsiderationForLoanAgreement"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_InterestReceivable" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_InterestReceivable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_InterestReceivable" xml:lang="en-US">Interest receivable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_InterestReceivable" xml:lang="en-US">Unsecured interest receivable</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_InterestReceivable" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_InterestReceivable"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_RepaymentsOfCurrentBorrowings" xlink:label="loc_F4248H746F72_ifrs-full_RepaymentsOfCurrentBorrowings"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_RepaymentsOfCurrentBorrowings" xml:lang="en-US">Repayments of current borrowings</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_RepaymentsOfCurrentBorrowings" xml:lang="en-US">Repayment of loans</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_RepaymentsOfCurrentBorrowings" xml:lang="en-US">Repayments</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_ifrs-full_RepaymentsOfCurrentBorrowings" xml:lang="en-US">Repayments</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_RepaymentsOfCurrentBorrowings" xlink:to="lab_H6460J968H94_ifrs-full_RepaymentsOfCurrentBorrowings"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_LoanAgreementSettled" xlink:label="loc_IF21F453I7K897H8F732_mtaff_LoanAgreementSettled"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_LoanAgreementSettled" xml:lang="en-US">Loan Agreement Settled</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_LoanAgreementSettled" xml:lang="en-US">Loan agreement settled</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_LoanAgreementSettled" xml:lang="en-US">Represents loan agreement settled.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_LoanAgreementSettled" xlink:to="lab_KH43H675K9M019J0H954_mtaff_LoanAgreementSettled"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_LossOnSettlementOfLoanAgreement" xlink:label="loc_F4248H746F72_mtaff_LossOnSettlementOfLoanAgreement"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_LossOnSettlementOfLoanAgreement" xml:lang="en-US">Loss On Settlement Of Loan Agreement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_LossOnSettlementOfLoanAgreement" xml:lang="en-US">Loss on settlement of loan agreement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_LossOnSettlementOfLoanAgreement" xml:lang="en-US">Represents amount related to loss on settlement of loan agreement.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_LossOnSettlementOfLoanAgreement" xlink:to="lab_H6460J968H94_mtaff_LossOnSettlementOfLoanAgreement"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xml:lang="en-US">Proceeds from borrowings, classified as financing activities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xml:lang="en-US">Proceeds from promissory notes</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities"/>







<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ParValuePerShare" xlink:label="loc_F4248H746F72_ifrs-full_ParValuePerShare"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_ParValuePerShare" xml:lang="en-US">Par value per share</label>
<label xlink:type="resource" xlink:label="lab_H6460J968H94_ifrs-full_ParValuePerShare" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Value per share</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_ParValuePerShare" xlink:to="lab_H6460J968H94_ifrs-full_ParValuePerShare"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfSharePurchaseWarrantsExercised" xlink:label="loc_IF21F453I7K897H8F732_mtaff_NumberOfSharePurchaseWarrantsExercised"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfSharePurchaseWarrantsExercised" xml:lang="en-US">Number Of Share Purchase Warrants Exercised</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfSharePurchaseWarrantsExercised" xml:lang="en-US">Number of share purchase warrants exercised</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfSharePurchaseWarrantsExercised" xml:lang="en-US">Represents the number of share purchase warrants exercised.</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfSharePurchaseWarrantsExercised" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xml:lang="en-US">Number of share purchase warrants exercised</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_NumberOfSharePurchaseWarrantsExercised" xlink:to="lab_KH43H675K9M019J0H954_mtaff_NumberOfSharePurchaseWarrantsExercised"/>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_TermOfWarrants" xlink:label="loc_IF21F453I7K897H8F732_mtaff_TermOfWarrants"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_TermOfWarrants" xml:lang="en-US">Term Of Warrants</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_TermOfWarrants" xml:lang="en-US">Term of warrants</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_TermOfWarrants" xml:lang="en-US">Represents term of warrants.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_TermOfWarrants" xlink:to="lab_KH43H675K9M019J0H954_mtaff_TermOfWarrants"/>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_InitialAdvanceOfConvertibleLoanFacility" xlink:label="loc_IF21F453I7K897H8F732_mtaff_InitialAdvanceOfConvertibleLoanFacility"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_InitialAdvanceOfConvertibleLoanFacility" xml:lang="en-US">Initial Advance Of Convertible Loan Facility</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_InitialAdvanceOfConvertibleLoanFacility" xml:lang="en-US">Initial advance of convertible loan facility</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_InitialAdvanceOfConvertibleLoanFacility" xml:lang="en-US">Represents amount of initial advance convertible loan facility.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_InitialAdvanceOfConvertibleLoanFacility" xlink:to="lab_KH43H675K9M019J0H954_mtaff_InitialAdvanceOfConvertibleLoanFacility"/>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_MinimumTranchesOfConvertibleLoanFacility" xlink:label="loc_IF21F453I7K897H8F732_mtaff_MinimumTranchesOfConvertibleLoanFacility"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_MinimumTranchesOfConvertibleLoanFacility" xml:lang="en-US">Minimum Tranches Of Convertible Loan Facility</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_MinimumTranchesOfConvertibleLoanFacility" xml:lang="en-US">Minimum tranches of convertible loan facility</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_MinimumTranchesOfConvertibleLoanFacility" xml:lang="en-US">Represents amount of minimum tranches of convertible loan facility.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_MinimumTranchesOfConvertibleLoanFacility" xlink:to="lab_KH43H675K9M019J0H954_mtaff_MinimumTranchesOfConvertibleLoanFacility"/>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_PrincipalPaymentDuePeriod" xlink:label="loc_IF21F453I7K897H8F732_mtaff_PrincipalPaymentDuePeriod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PrincipalPaymentDuePeriod" xml:lang="en-US">Principal Payment Due Period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PrincipalPaymentDuePeriod" xml:lang="en-US">Principal payment due period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PrincipalPaymentDuePeriod" xml:lang="en-US">Represents principal payment Due Period.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_PrincipalPaymentDuePeriod" xlink:to="lab_KH43H675K9M019J0H954_mtaff_PrincipalPaymentDuePeriod"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ConversionPricePerShare" xlink:label="loc_F4248H746F72_mtaff_ConversionPricePerShare"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ConversionPricePerShare" xml:lang="en-US">Conversion Price Per Share</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_ConversionPricePerShare" xml:lang="en-US">Conversion price per share</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ConversionPricePerShare" xml:lang="en-US">Represents conversion price per share.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ConversionPricePerShare" xlink:to="lab_H6460J968H94_mtaff_ConversionPricePerShare"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_Borrowings" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_Borrowings"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_Borrowings" xml:lang="en-US">Borrowings</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_Borrowings" xml:lang="en-US">Loans payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_Borrowings" xml:lang="en-US">Opening balance</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_Borrowings" xml:lang="en-US">Ending balance</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_Borrowings" xml:lang="en-US">Loans payable</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_Borrowings" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_Borrowings"/>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfSharesIssuedDuringPeriod" xlink:label="loc_IF21F453I7K897H8F732_mtaff_NumberOfSharesIssuedDuringPeriod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfSharesIssuedDuringPeriod" xml:lang="en-US">Number Of Shares Issued During Period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfSharesIssuedDuringPeriod" xml:lang="en-US">Number of shares issued during period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfSharesIssuedDuringPeriod" xml:lang="en-US">The number of shares issued during period.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_NumberOfSharesIssuedDuringPeriod" xlink:to="lab_KH43H675K9M019J0H954_mtaff_NumberOfSharesIssuedDuringPeriod"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfSharesIssuedDuringPeriodValue" xlink:label="loc_F4248H746F72_mtaff_NumberOfSharesIssuedDuringPeriodValue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_NumberOfSharesIssuedDuringPeriodValue" xml:lang="en-US">Number Of Shares Issued During Period Value</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_NumberOfSharesIssuedDuringPeriodValue" xml:lang="en-US">Value of shares issued during period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_NumberOfSharesIssuedDuringPeriodValue" xml:lang="en-US">Value of shares issued during period.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_NumberOfSharesIssuedDuringPeriodValue" xlink:to="lab_H6460J968H94_mtaff_NumberOfSharesIssuedDuringPeriodValue"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ValueOfUnitsIssuedInPeriod" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ValueOfUnitsIssuedInPeriod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ValueOfUnitsIssuedInPeriod" xml:lang="en-US">Value Of Units Issued In Period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ValueOfUnitsIssuedInPeriod" xml:lang="en-US">Value of units issued in period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ValueOfUnitsIssuedInPeriod" xml:lang="en-US">Represents value of units issued in period.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ValueOfUnitsIssuedInPeriod" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ValueOfUnitsIssuedInPeriod"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_UnitsIssuedInPeriod" xlink:label="loc_F4248H746F72_mtaff_UnitsIssuedInPeriod"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_UnitsIssuedInPeriod" xml:lang="en-US">Units Issued In Period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_UnitsIssuedInPeriod" xml:lang="en-US">Units issued in period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_UnitsIssuedInPeriod" xml:lang="en-US">Units issued in period.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_UnitsIssuedInPeriod" xlink:to="lab_H6460J968H94_mtaff_UnitsIssuedInPeriod"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_UnitsIssuedInPeriodPricePerUnit" xlink:label="loc_IF21F453I7K897H8F732_mtaff_UnitsIssuedInPeriodPricePerUnit"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_UnitsIssuedInPeriodPricePerUnit" xml:lang="en-US">Units Issued In Period Price Per Unit</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_UnitsIssuedInPeriodPricePerUnit" xml:lang="en-US">Units issued in period price per unit</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_UnitsIssuedInPeriodPricePerUnit" xml:lang="en-US">Represents price per unit issued in period.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_UnitsIssuedInPeriodPricePerUnit" xlink:to="lab_KH43H675K9M019J0H954_mtaff_UnitsIssuedInPeriodPricePerUnit"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AccelerationQualityOfWarrantsIssued" xlink:label="loc_F4248H746F72_mtaff_AccelerationQualityOfWarrantsIssued"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_AccelerationQualityOfWarrantsIssued" xml:lang="en-US">Acceleration Quality Of Warrants Issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_AccelerationQualityOfWarrantsIssued" xml:lang="en-US">Acceleration quality of warrants issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_AccelerationQualityOfWarrantsIssued" xml:lang="en-US">Acceleration Quality Of Warrants Issued</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_AccelerationQualityOfWarrantsIssued" xlink:to="lab_H6460J968H94_mtaff_AccelerationQualityOfWarrantsIssued"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_FairValueOfWarrantsIssued" xlink:label="loc_IF21F453I7K897H8F732_mtaff_FairValueOfWarrantsIssued"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FairValueOfWarrantsIssued" xml:lang="en-US">Fair Value Of Warrants Issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FairValueOfWarrantsIssued" xml:lang="en-US">Fair value of warrants issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FairValueOfWarrantsIssued" xml:lang="en-US">Represents fair value of warrants issued.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_FairValueOfWarrantsIssued" xlink:to="lab_KH43H675K9M019J0H954_mtaff_FairValueOfWarrantsIssued"/>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfFindersWarrantsIssued" xlink:label="loc_IF21F453I7K897H8F732_mtaff_NumberOfFindersWarrantsIssued"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfFindersWarrantsIssued" xml:lang="en-US">Number Of Finders Warrants Issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfFindersWarrantsIssued" xml:lang="en-US">Number of underwriter warrants issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfFindersWarrantsIssued" xml:lang="en-US">Issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfFindersWarrantsIssued" xml:lang="en-US">Represents the number of finders warrants issued.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_NumberOfFindersWarrantsIssued" xlink:to="lab_KH43H675K9M019J0H954_mtaff_NumberOfFindersWarrantsIssued"/>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_PercentageOfMaximumNumberOfSharesReservedForIssuanceUnderTheStockOptionPlan" xlink:label="loc_IF21F453I7K897H8F732_mtaff_PercentageOfMaximumNumberOfSharesReservedForIssuanceUnderTheStockOptionPlan"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PercentageOfMaximumNumberOfSharesReservedForIssuanceUnderTheStockOptionPlan" xml:lang="en-US">Percentage Of Maximum Number Of Shares Reserved For Issuance Under The Stock Option Plan</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PercentageOfMaximumNumberOfSharesReservedForIssuanceUnderTheStockOptionPlan" xml:lang="en-US">Percentage of maximum number of shares reserved for issuance under the stock option plan</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PercentageOfMaximumNumberOfSharesReservedForIssuanceUnderTheStockOptionPlan" xml:lang="en-US">Percentage of maximum number of shares that may be reserved for issuance under the stock option plan.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_PercentageOfMaximumNumberOfSharesReservedForIssuanceUnderTheStockOptionPlan" xlink:to="lab_KH43H675K9M019J0H954_mtaff_PercentageOfMaximumNumberOfSharesReservedForIssuanceUnderTheStockOptionPlan"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:label="loc_F4248H746F72_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xml:lang="en-US">Number of share options exercisable in share-based payment arrangement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xml:lang="en-US">Exercisable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xml:lang="en-US">Stock options exercisable in share-based payment arrangement</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:to="lab_H6460J968H94_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions" xml:lang="en-US">Weighted average remaining contractual life of outstanding share options</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions" xml:lang="en-US">Weighted average remaining life of stock options outstanding</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_PercentageOfMaximumNumberOfRestrictedShareUnitsSharesReservedForIssuance" xlink:label="loc_F4248H746F72_mtaff_PercentageOfMaximumNumberOfRestrictedShareUnitsSharesReservedForIssuance"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_PercentageOfMaximumNumberOfRestrictedShareUnitsSharesReservedForIssuance" xml:lang="en-US">Percentage Of Maximum Number Of Restricted Share Units Shares Reserved For Issuance</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_PercentageOfMaximumNumberOfRestrictedShareUnitsSharesReservedForIssuance" xml:lang="en-US">Percentage of maximum number of RSU shares reserved for issuance</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_PercentageOfMaximumNumberOfRestrictedShareUnitsSharesReservedForIssuance" xml:lang="en-US">Percentage of maximum number of RSU shares that may be reserved for issuance under the plan.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_PercentageOfMaximumNumberOfRestrictedShareUnitsSharesReservedForIssuance" xlink:to="lab_H6460J968H94_mtaff_PercentageOfMaximumNumberOfRestrictedShareUnitsSharesReservedForIssuance"/>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_StockOptionsPlanExpense" xlink:label="loc_F4248H746F72_mtaff_StockOptionsPlanExpense"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_StockOptionsPlanExpense" xml:lang="en-US">Stock Options Plan Expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_StockOptionsPlanExpense" xml:lang="en-US">Stock options plan expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_StockOptionsPlanExpense" xml:lang="en-US">Represents amount of stock options plan expense.</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_mtaff_StockOptionsPlanExpense" xml:lang="en-US">Share-based payments</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_StockOptionsPlanExpense" xlink:to="lab_H6460J968H94_mtaff_StockOptionsPlanExpense"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_FairValueOfRestrictedShareUnitsGranted" xlink:label="loc_IF21F453I7K897H8F732_mtaff_FairValueOfRestrictedShareUnitsGranted"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FairValueOfRestrictedShareUnitsGranted" xml:lang="en-US">Fair Value Of Restricted Share Units Granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FairValueOfRestrictedShareUnitsGranted" xml:lang="en-US">Restricted share units vested</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FairValueOfRestrictedShareUnitsGranted" xml:lang="en-US">Fair value of restricted stock units granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FairValueOfRestrictedShareUnitsGranted" xml:lang="en-US">Fair value of restricted share units granted.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_FairValueOfRestrictedShareUnitsGranted" xlink:to="lab_KH43H675K9M019J0H954_mtaff_FairValueOfRestrictedShareUnitsGranted"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_WeightedAverageFairValueOfRestrictedShareUnitsGranted" xlink:label="loc_F4248H746F72_mtaff_WeightedAverageFairValueOfRestrictedShareUnitsGranted"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_WeightedAverageFairValueOfRestrictedShareUnitsGranted" xml:lang="en-US">Weighted Average Fair Value Of Restricted Share Units Granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_WeightedAverageFairValueOfRestrictedShareUnitsGranted" xml:lang="en-US">Weighted average fair value of restricted share units granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_WeightedAverageFairValueOfRestrictedShareUnitsGranted" xml:lang="en-US">The weighted average fair value of other equity instruments granted.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_WeightedAverageFairValueOfRestrictedShareUnitsGranted" xlink:to="lab_H6460J968H94_mtaff_WeightedAverageFairValueOfRestrictedShareUnitsGranted"/>










<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xml:lang="en-US">Number of other equity instruments granted in share-based payment arrangement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xml:lang="en-US">Restricted share units granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xml:lang="en-US">Restricted share units granted</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable" xml:lang="en-US">Disclosure of transactions between related parties [table]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable" xlink:to="lab_H6460J968H94_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_PresidentAndCeoMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_PresidentAndCeoMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PresidentAndCeoMember" xml:lang="en-US">President And Ceo [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PresidentAndCeoMember" xml:lang="en-US">President and CEO</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PresidentAndCeoMember" xml:lang="en-US">President is first or second ranking officer of the entity that may be appointed by the board of directors and CEO is the highest ranking executive officer, who has ultimate managerial responsibility for the entity and who reports to the board of directors.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_PresidentAndCeoMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_PresidentAndCeoMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_HighStreamCorpMember" xlink:label="loc_F4248H746F72_mtaff_HighStreamCorpMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_HighStreamCorpMember" xml:lang="en-US">High Stream Corp [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_HighStreamCorpMember" xml:lang="en-US">High Stream Corp. ("High Stream")</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_HighStreamCorpMember" xml:lang="en-US">High Stream Corp</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_HighStreamCorpMember" xlink:to="lab_H6460J968H94_mtaff_HighStreamCorpMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xml:lang="en-US">Disclosure of transactions between related parties [line items]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_AmountsPayableRelatedPartyTransactions" xlink:label="loc_F4248H746F72_ifrs-full_AmountsPayableRelatedPartyTransactions"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_AmountsPayableRelatedPartyTransactions" xml:lang="en-US">Amounts payable, related party transactions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_AmountsPayableRelatedPartyTransactions" xml:lang="en-US">Due to directors and management for remuneration and expense reimbursements</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_AmountsPayableRelatedPartyTransactions" xlink:to="lab_H6460J968H94_ifrs-full_AmountsPayableRelatedPartyTransactions"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_FinderFeesPaid" xlink:label="loc_IF21F453I7K897H8F732_mtaff_FinderFeesPaid"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FinderFeesPaid" xml:lang="en-US">Finder Fees Paid</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FinderFeesPaid" xml:lang="en-US">Finder fees paid</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_FinderFeesPaid" xml:lang="en-US">The amount of finder fees paid.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_FinderFeesPaid" xlink:to="lab_KH43H675K9M019J0H954_mtaff_FinderFeesPaid"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_FinancingBonusReceived" xlink:label="loc_F4248H746F72_mtaff_FinancingBonusReceived"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_FinancingBonusReceived" xml:lang="en-US">Financing Bonus Received</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_FinancingBonusReceived" xml:lang="en-US">Financing bonus received</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_FinancingBonusReceived" xml:lang="en-US">The amount of financing bonus received.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_FinancingBonusReceived" xlink:to="lab_H6460J968H94_mtaff_FinancingBonusReceived"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_SupplementalDisclosureOfCashFlowTable" xlink:label="loc_IF21F453I7K897H8F732_mtaff_SupplementalDisclosureOfCashFlowTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_SupplementalDisclosureOfCashFlowTable" xml:lang="en-US">Supplemental Disclosure Of Cash Flow [Table]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_SupplementalDisclosureOfCashFlowTable" xml:lang="en-US">Represents supplemental disclosure of cash flow table.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_SupplementalDisclosureOfCashFlowTable" xlink:to="lab_KH43H675K9M019J0H954_mtaff_SupplementalDisclosureOfCashFlowTable"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_SantaGertrudisAcquisitonsMember" xlink:label="loc_F4248H746F72_mtaff_SantaGertrudisAcquisitonsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_SantaGertrudisAcquisitonsMember" xml:lang="en-US">Santa Gertrudis Acquisitons [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_SantaGertrudisAcquisitonsMember" xml:lang="en-US">Santa Gertrudis acquisitions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_SantaGertrudisAcquisitonsMember" xml:lang="en-US">Santa Gertrudis acquisitons.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_SantaGertrudisAcquisitonsMember" xlink:to="lab_H6460J968H94_mtaff_SantaGertrudisAcquisitonsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_SupplementalDisclosureOfCashFlowLineItems" xlink:label="loc_IF21F453I7K897H8F732_mtaff_SupplementalDisclosureOfCashFlowLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_SupplementalDisclosureOfCashFlowLineItems" xml:lang="en-US">Supplemental Disclosure Of Cash Flow [Line Items]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_SupplementalDisclosureOfCashFlowLineItems" xml:lang="en-US">Represents supplemental disclosure of cash flow line item.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_SupplementalDisclosureOfCashFlowLineItems" xlink:to="lab_KH43H675K9M019J0H954_mtaff_SupplementalDisclosureOfCashFlowLineItems"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfSharePurchaseWarrantsIssuedForAcquisitionsOfRoyaltyInterests" xlink:label="loc_F4248H746F72_mtaff_NumberOfSharePurchaseWarrantsIssuedForAcquisitionsOfRoyaltyInterests"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_NumberOfSharePurchaseWarrantsIssuedForAcquisitionsOfRoyaltyInterests" xml:lang="en-US">Number Of Share Purchase Warrants Issued For Acquisitions Of Royalty Interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_NumberOfSharePurchaseWarrantsIssuedForAcquisitionsOfRoyaltyInterests" xml:lang="en-US">Number of share purchase warrants issued for acquisitions of royalty interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_NumberOfSharePurchaseWarrantsIssuedForAcquisitionsOfRoyaltyInterests" xml:lang="en-US">Represents the number of share purchase warrants issued for acquisitions of royalty interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_NumberOfSharePurchaseWarrantsIssuedForAcquisitionsOfRoyaltyInterests" xlink:to="lab_H6460J968H94_mtaff_NumberOfSharePurchaseWarrantsIssuedForAcquisitionsOfRoyaltyInterests"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AggregateValueOfAcquisitionsOfRoyaltyInterests" xlink:label="loc_IF21F453I7K897H8F732_mtaff_AggregateValueOfAcquisitionsOfRoyaltyInterests"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_AggregateValueOfAcquisitionsOfRoyaltyInterests" xml:lang="en-US">Aggregate Value Of Acquisitions Of Royalty Interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_AggregateValueOfAcquisitionsOfRoyaltyInterests" xml:lang="en-US">Aggregate value of acquisitions of royalty interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_AggregateValueOfAcquisitionsOfRoyaltyInterests" xml:lang="en-US">The amount of aggregate value of acquisitions of royalty interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_AggregateValueOfAcquisitionsOfRoyaltyInterests" xlink:to="lab_KH43H675K9M019J0H954_mtaff_AggregateValueOfAcquisitionsOfRoyaltyInterests"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfCommonSharesIssuedForNetAssetsAcquired" xlink:label="loc_F4248H746F72_mtaff_NumberOfCommonSharesIssuedForNetAssetsAcquired"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_NumberOfCommonSharesIssuedForNetAssetsAcquired" xml:lang="en-US">Number Of Common Shares Issued For Net Assets Acquired</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_NumberOfCommonSharesIssuedForNetAssetsAcquired" xml:lang="en-US">Number of common shares and convertible debenture issued for net assets acquired</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_NumberOfCommonSharesIssuedForNetAssetsAcquired" xml:lang="en-US">Represents the number of common shares issued for net assets acquired, as non-cash investing and financing activities.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_NumberOfCommonSharesIssuedForNetAssetsAcquired" xlink:to="lab_H6460J968H94_mtaff_NumberOfCommonSharesIssuedForNetAssetsAcquired"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AggregateValueOfCommonSharesAndConvertibleDebentureForNetAssetsAcquired" xlink:label="loc_IF21F453I7K897H8F732_mtaff_AggregateValueOfCommonSharesAndConvertibleDebentureForNetAssetsAcquired"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_AggregateValueOfCommonSharesAndConvertibleDebentureForNetAssetsAcquired" xml:lang="en-US">Aggregate Value Of Common Shares And Convertible Debenture For Net Assets Acquired</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_AggregateValueOfCommonSharesAndConvertibleDebentureForNetAssetsAcquired" xml:lang="en-US">Aggregate value of common shares and convertible debenture for net assets acquired</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_AggregateValueOfCommonSharesAndConvertibleDebentureForNetAssetsAcquired" xml:lang="en-US">The amount of aggregate value of common shares and convertible debenture for net assets acquired, as non-cash investing and financing activities.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_AggregateValueOfCommonSharesAndConvertibleDebentureForNetAssetsAcquired" xlink:to="lab_KH43H675K9M019J0H954_mtaff_AggregateValueOfCommonSharesAndConvertibleDebentureForNetAssetsAcquired"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfSharePurchaseWarrantsIssuedOnSettlementOfLoansPayable" xlink:label="loc_F4248H746F72_mtaff_NumberOfSharePurchaseWarrantsIssuedOnSettlementOfLoansPayable_1_1"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_NumberOfSharePurchaseWarrantsIssuedOnSettlementOfLoansPayable" xml:lang="en-US">Number Of Share Purchase Warrants Issued On Settlement Of Loans Payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_NumberOfSharePurchaseWarrantsIssuedOnSettlementOfLoansPayable" xml:lang="en-US">Number of share purchase warrants issued on settlement of loans payable</label>

<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_NumberOfSharePurchaseWarrantsIssuedOnSettlementOfLoansPayable_1_1" xlink:to="lab_H6460J968H94_mtaff_NumberOfSharePurchaseWarrantsIssuedOnSettlementOfLoansPayable"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_NumberOfSharePurchaseWarrantsIssuedOnSettlementOfLoansPayable" xml:lang="en-US">The number of share purchase warrants issued on settlement of loans payable.</label>








<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ReallocationOfDeferredAcquisitionCostsToRoyaltyAndStreamInterestsOnClosingOfAcquisition" xlink:label="loc_F4248H746F72_mtaff_ReallocationOfDeferredAcquisitionCostsToRoyaltyAndStreamInterestsOnClosingOfAcquisition"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ReallocationOfDeferredAcquisitionCostsToRoyaltyAndStreamInterestsOnClosingOfAcquisition" xml:lang="en-US">Reallocation Of Deferred Acquisition Costs To Royalty And Stream Interests On Closing Of Acquisition</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_ReallocationOfDeferredAcquisitionCostsToRoyaltyAndStreamInterestsOnClosingOfAcquisition" xml:lang="en-US">Reallocation of deferred acquisition costs to royalty and stream interests on closing of acquisition</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ReallocationOfDeferredAcquisitionCostsToRoyaltyAndStreamInterestsOnClosingOfAcquisition" xml:lang="en-US">The amount of reallocation of deferred acquisition costs to royalty and stream interests on closing of acquisition.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ReallocationOfDeferredAcquisitionCostsToRoyaltyAndStreamInterestsOnClosingOfAcquisition" xlink:to="lab_H6460J968H94_mtaff_ReallocationOfDeferredAcquisitionCostsToRoyaltyAndStreamInterestsOnClosingOfAcquisition"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ReallocationFromReservesForStockOptionsExercised" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ReallocationFromReservesForStockOptionsExercised"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ReallocationFromReservesForStockOptionsExercised" xml:lang="en-US">Reallocation From Reserves For Stock Options Exercised</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ReallocationFromReservesForStockOptionsExercised" xml:lang="en-US">Reallocation from reserves for stock options exercised</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ReallocationFromReservesForStockOptionsExercised" xml:lang="en-US">The amount of reallocation from reserves for stock options exercised.</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ReallocationFromReservesForStockOptionsExercised" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xml:lang="en-US">Reallocation from reserves for stock options exercised</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ReallocationFromReservesForStockOptionsExercised" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ReallocationFromReservesForStockOptionsExercised"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement" xlink:label="loc_F4248H746F72_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement" xml:lang="en-US">Number of share options exercised in share-based payment arrangement</label>

<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement" xml:lang="en-US">Number of share options exercised in share-based payment arrangement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement" xml:lang="en-US">Exercised</label>

<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement" xlink:to="lab_H6460J968H94_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ReallocationFromReservesForSharePurchaseWarrantsExercised" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ReallocationFromReservesForSharePurchaseWarrantsExercised"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ReallocationFromReservesForSharePurchaseWarrantsExercised" xml:lang="en-US">Reallocation From Reserves For Share Purchase Warrants Exercised</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ReallocationFromReservesForSharePurchaseWarrantsExercised" xml:lang="en-US">Reallocation from reserves for share purchase warrants exercised</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ReallocationFromReservesForSharePurchaseWarrantsExercised" xml:lang="en-US">The amount of reallocation from reserves for share purchase warrants exercised.</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ReallocationFromReservesForSharePurchaseWarrantsExercised" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xml:lang="en-US">Reallocation from reserves for share purchase warrants exercised</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ReallocationFromReservesForSharePurchaseWarrantsExercised" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ReallocationFromReservesForSharePurchaseWarrantsExercised"/>










<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfCommonSharesAcquisition" xlink:label="loc_F4248H746F72_mtaff_NumberOfCommonSharesAcquisition"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_NumberOfCommonSharesAcquisition" xml:lang="en-US">Number Of Common Shares Acquisition</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_NumberOfCommonSharesAcquisition" xml:lang="en-US">Number of common shares acquisition</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_NumberOfCommonSharesAcquisition" xml:lang="en-US"></label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_NumberOfCommonSharesAcquisition" xlink:to="lab_H6460J968H94_mtaff_NumberOfCommonSharesAcquisition"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ValueOfCommonSharesAcquisition" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ValueOfCommonSharesAcquisition"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ValueOfCommonSharesAcquisition" xml:lang="en-US">Value Of Common Shares Acquisition</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ValueOfCommonSharesAcquisition" xml:lang="en-US">Value of common shares acquisition</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ValueOfCommonSharesAcquisition" xml:lang="en-US">Represents amount related to acquisitions.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ValueOfCommonSharesAcquisition" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ValueOfCommonSharesAcquisition"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfFinancialInstrumentsTable" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfFinancialInstrumentsTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfFinancialInstrumentsTable" xml:lang="en-US">Disclosure of detailed information about financial instruments [table]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DisclosureOfFinancialInstrumentsTable" xlink:to="lab_H6460J968H94_ifrs-full_DisclosureOfFinancialInstrumentsTable"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TypesOfRisksAxis" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_TypesOfRisksAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_TypesOfRisksAxis" xml:lang="en-US">Types of risks [axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_TypesOfRisksAxis" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_TypesOfRisksAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TypesOfRisksMember" xlink:label="loc_F4248H746F72_ifrs-full_TypesOfRisksMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_TypesOfRisksMember" xml:lang="en-US">Risks [member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_TypesOfRisksMember" xlink:to="lab_H6460J968H94_ifrs-full_TypesOfRisksMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CurrencyRiskMember" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_CurrencyRiskMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CurrencyRiskMember" xml:lang="en-US">Currency risk [member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CurrencyRiskMember" xml:lang="en-US">Currency risk</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_CurrencyRiskMember" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_CurrencyRiskMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfFinancialInstrumentsLineItems" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfFinancialInstrumentsLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfFinancialInstrumentsLineItems" xml:lang="en-US">Disclosure of detailed information about financial instruments [line items]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DisclosureOfFinancialInstrumentsLineItems" xlink:to="lab_H6460J968H94_ifrs-full_DisclosureOfFinancialInstrumentsLineItems"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_SensitivityAnalysisVariancePrice" xlink:label="loc_IF21F453I7K897H8F732_mtaff_SensitivityAnalysisVariancePrice"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_SensitivityAnalysisVariancePrice" xml:lang="en-US">Sensitivity Analysis Variance Price</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_SensitivityAnalysisVariancePrice" xml:lang="en-US">Sensitivity analysis, variance, percentage</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_SensitivityAnalysisVariancePrice" xml:lang="en-US">Sensitivity analysis, variance, percentage.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_SensitivityAnalysisVariancePrice" xlink:to="lab_KH43H675K9M019J0H954_mtaff_SensitivityAnalysisVariancePrice"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ValueAtRisk" xlink:label="loc_F4248H746F72_ifrs-full_ValueAtRisk"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_ValueAtRisk" xml:lang="en-US">Value at risk</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_ValueAtRisk" xlink:to="lab_H6460J968H94_ifrs-full_ValueAtRisk"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable" xml:lang="en-US">Disclosure of non-adjusting events after reporting period [table]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_PurchaseAndSaleAgreementMember" xlink:label="loc_F4248H746F72_mtaff_PurchaseAndSaleAgreementMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_PurchaseAndSaleAgreementMember" xml:lang="en-US">Purchase And Sale Agreement [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_PurchaseAndSaleAgreementMember" xml:lang="en-US">Purchase and sale agreement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_PurchaseAndSaleAgreementMember" xml:lang="en-US">This member stand for purchase and sale agreement.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_PurchaseAndSaleAgreementMember" xlink:to="lab_H6460J968H94_mtaff_PurchaseAndSaleAgreementMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_LegalEntitiesAxis" xlink:label="loc_IF21F453I7K897H8F732_mtaff_LegalEntitiesAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_LegalEntitiesAxis" xml:lang="en-US">Legal Entities [Axis]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_LegalEntitiesAxis" xml:lang="en-US">The axis of a table defines the relationship between the domain members or categories in the table and the line items or concepts that complete the table.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_LegalEntitiesAxis" xlink:to="lab_KH43H675K9M019J0H954_mtaff_LegalEntitiesAxis"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_LegalEntitiesDomain" xlink:label="loc_F4248H746F72_mtaff_LegalEntitiesDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_LegalEntitiesDomain" xml:lang="en-US">Legal Entities [Domain]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_LegalEntitiesDomain" xml:lang="en-US">All the entities being reported upon in a document.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_LegalEntitiesDomain" xlink:to="lab_H6460J968H94_mtaff_LegalEntitiesDomain"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_OrionNsrRoyaltyMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_OrionNsrRoyaltyMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_OrionNsrRoyaltyMember" xml:lang="en-US">Orion Nsr Royalty [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_OrionNsrRoyaltyMember" xml:lang="en-US">Orion NSR royalty</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_OrionNsrRoyaltyMember" xml:lang="en-US">Represents information of Orion NSR royalty.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_OrionNsrRoyaltyMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_OrionNsrRoyaltyMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems" xml:lang="en-US">Disclosure of non-adjusting events after reporting period [line items]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems" xlink:to="lab_H6460J968H94_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_PercentageOfAdditionalInterestAcquired" xlink:label="loc_IF21F453I7K897H8F732_mtaff_PercentageOfAdditionalInterestAcquired"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PercentageOfAdditionalInterestAcquired" xml:lang="en-US">Percentage Of Additional Interest Acquired</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PercentageOfAdditionalInterestAcquired" xml:lang="en-US">Percentage of additional interest acquired</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_PercentageOfAdditionalInterestAcquired" xml:lang="en-US">Represents percentage of additional interest acquired.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_PercentageOfAdditionalInterestAcquired" xlink:to="lab_KH43H675K9M019J0H954_mtaff_PercentageOfAdditionalInterestAcquired"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AmountOfAdditionalInterestAcquired" xlink:label="loc_F4248H746F72_mtaff_AmountOfAdditionalInterestAcquired_1"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_AmountOfAdditionalInterestAcquired" xml:lang="en-US">Amount Of Additional Interest Acquired</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_AmountOfAdditionalInterestAcquired" xml:lang="en-US">Additional interest acquired</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_AmountOfAdditionalInterestAcquired_1" xlink:to="lab_H6460J968H94_mtaff_AmountOfAdditionalInterestAcquired"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_AmountOfAdditionalInterestAcquired" xml:lang="en-US">Represents amount of additional interest acquired.</label>

<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_RepaymentOfThirdPartyLoans" xlink:label="loc_IF21F453I7K897H8F732_mtaff_RepaymentOfThirdPartyLoans"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RepaymentOfThirdPartyLoans" xml:lang="en-US">Repayment Of Third Party Loans</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RepaymentOfThirdPartyLoans" xml:lang="en-US">Repayment third party loans</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RepaymentOfThirdPartyLoans" xml:lang="en-US">Represents amount of third party loans.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_RepaymentOfThirdPartyLoans" xlink:to="lab_KH43H675K9M019J0H954_mtaff_RepaymentOfThirdPartyLoans"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CurrentTradeReceivables" xlink:label="loc_F4248H746F72_ifrs-full_CurrentTradeReceivables"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_CurrentTradeReceivables" xml:lang="en-US">Current trade receivables</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_CurrentTradeReceivables" xml:lang="en-US">Receivables from provisional sales</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_CurrentTradeReceivables" xml:lang="en-US">Trade receivables</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/positiveLabel" xlink:label="lab_H6460J968H94_ifrs-full_CurrentTradeReceivables" xml:lang="en-US">Trade receivables</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_CurrentTradeReceivables" xlink:to="lab_H6460J968H94_ifrs-full_CurrentTradeReceivables"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CurrentReceivablesFromTaxesOtherThanIncomeTax" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_CurrentReceivablesFromTaxesOtherThanIncomeTax"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CurrentReceivablesFromTaxesOtherThanIncomeTax" xml:lang="en-US">Current receivables from taxes other than income tax</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_CurrentReceivablesFromTaxesOtherThanIncomeTax" xml:lang="en-US">GST recoverable</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_CurrentReceivablesFromTaxesOtherThanIncomeTax" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_CurrentReceivablesFromTaxesOtherThanIncomeTax"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_Prepayments" xlink:label="loc_F4248H746F72_ifrs-full_Prepayments"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_Prepayments" xml:lang="en-US">Prepayments</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_Prepayments" xml:lang="en-US">Prepaid expenses and deposits</label>
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<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_CoeurStreamAndRoyaltyInterestsMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_CoeurStreamAndRoyaltyInterestsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CoeurStreamAndRoyaltyInterestsMember" xml:lang="en-US">Coeur Stream And Royalty Interests [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CoeurStreamAndRoyaltyInterestsMember" xml:lang="en-US">Coeur stream and royalty interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CoeurStreamAndRoyaltyInterestsMember" xml:lang="en-US">Coeur stream and royalty interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_CoeurStreamAndRoyaltyInterestsMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_CoeurStreamAndRoyaltyInterestsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_OtherRoyaltyInterestsMember" xlink:label="loc_F4248H746F72_mtaff_OtherRoyaltyInterestsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_OtherRoyaltyInterestsMember" xml:lang="en-US">Other Royalty Interests [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_OtherRoyaltyInterestsMember" xml:lang="en-US">Other royalty interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_OtherRoyaltyInterestsMember" xml:lang="en-US">Other royalty interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_OtherRoyaltyInterestsMember" xlink:to="lab_H6460J968H94_mtaff_OtherRoyaltyInterestsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AlamosRoyaltyInterestsMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_AlamosRoyaltyInterestsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_AlamosRoyaltyInterestsMember" xml:lang="en-US">Alamos Royalty Interests [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_AlamosRoyaltyInterestsMember" xml:lang="en-US">Alamos Royalty Interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_AlamosRoyaltyInterestsMember" xml:lang="en-US">Alamos royalty interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_AlamosRoyaltyInterestsMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_AlamosRoyaltyInterestsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_CoseAcquisitionsMember" xlink:label="loc_F4248H746F72_mtaff_CoseAcquisitionsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_CoseAcquisitionsMember" xml:lang="en-US">Cose Acquisitions [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_CoseAcquisitionsMember" xml:lang="en-US">COSE acquisitions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_CoseAcquisitionsMember" xml:lang="en-US">COSE acquisitions.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_CoseAcquisitionsMember" xlink:to="lab_H6460J968H94_mtaff_CoseAcquisitionsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_OtherAcquisitionCostsOfRoyaltyAndStreamInterests" xlink:label="loc_IF21F453I7K897H8F732_mtaff_OtherAcquisitionCostsOfRoyaltyAndStreamInterests"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_OtherAcquisitionCostsOfRoyaltyAndStreamInterests" xml:lang="en-US">Other Acquisition Costs Of Royalty And Stream Interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_OtherAcquisitionCostsOfRoyaltyAndStreamInterests" xml:lang="en-US">Other acquisition costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_OtherAcquisitionCostsOfRoyaltyAndStreamInterests" xml:lang="en-US">Other acquisition costs of Royalty and stream interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_OtherAcquisitionCostsOfRoyaltyAndStreamInterests" xlink:to="lab_KH43H675K9M019J0H954_mtaff_OtherAcquisitionCostsOfRoyaltyAndStreamInterests"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DepletionOfRoyaltyAndStreamInterests" xlink:label="loc_F4248H746F72_mtaff_DepletionOfRoyaltyAndStreamInterests"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_DepletionOfRoyaltyAndStreamInterests" xml:lang="en-US">Depletion Of Royalty And Stream Interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_DepletionOfRoyaltyAndStreamInterests" xml:lang="en-US">Depletion</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_DepletionOfRoyaltyAndStreamInterests" xml:lang="en-US">Depletion of Royalty and stream interests.</label>
<label xlink:type="resource" xlink:label="lab_H6460J968H94_mtaff_DepletionOfRoyaltyAndStreamInterests" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xml:lang="en-US">Depletion</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_DepletionOfRoyaltyAndStreamInterests" xlink:to="lab_H6460J968H94_mtaff_DepletionOfRoyaltyAndStreamInterests"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_RecoveriesOfRoyaltyAndStreamInterests" xlink:label="loc_IF21F453I7K897H8F732_mtaff_RecoveriesOfRoyaltyAndStreamInterests"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RecoveriesOfRoyaltyAndStreamInterests" xml:lang="en-US">Recoveries Of Royalty And Stream Interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RecoveriesOfRoyaltyAndStreamInterests" xml:lang="en-US">Recoveries</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RecoveriesOfRoyaltyAndStreamInterests" xml:lang="en-US">Recoveries of Royalty and stream interests.</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_mtaff_RecoveriesOfRoyaltyAndStreamInterests" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xml:lang="en-US">Recoveries</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_RecoveriesOfRoyaltyAndStreamInterests" xlink:to="lab_KH43H675K9M019J0H954_mtaff_RecoveriesOfRoyaltyAndStreamInterests"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax" xlink:label="loc_F4248H746F72_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax" xml:lang="en-US">Gains (losses) on exchange differences on translation, net of tax</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax" xml:lang="en-US">Foreign currency translation adjustment</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax" xml:lang="en-US">Currency translation adjustments</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax" xlink:to="lab_H6460J968H94_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_HistoricalCostsRoyaltyAndStreamInterests" xlink:label="loc_IF21F453I7K897H8F732_mtaff_HistoricalCostsRoyaltyAndStreamInterests"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_HistoricalCostsRoyaltyAndStreamInterests" xml:lang="en-US">Historical Costs Royalty And Stream Interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_HistoricalCostsRoyaltyAndStreamInterests" xml:lang="en-US">Historical costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_HistoricalCostsRoyaltyAndStreamInterests" xml:lang="en-US">Historical costs Royalty and stream interests.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_HistoricalCostsRoyaltyAndStreamInterests" xlink:to="lab_KH43H675K9M019J0H954_mtaff_HistoricalCostsRoyaltyAndStreamInterests"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AccumulatedDepletionRoyaltyAndStreamInterests" xlink:label="loc_F4248H746F72_mtaff_AccumulatedDepletionRoyaltyAndStreamInterests"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_AccumulatedDepletionRoyaltyAndStreamInterests" xml:lang="en-US">Accumulated Depletion Royalty And Stream Interests</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_AccumulatedDepletionRoyaltyAndStreamInterests" xml:lang="en-US">Accumulated depletion</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_AccumulatedDepletionRoyaltyAndStreamInterests" xml:lang="en-US">Accumulated depletion Royalty and stream interests.</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_mtaff_AccumulatedDepletionRoyaltyAndStreamInterests" xml:lang="en-US">Accumulated depletion</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_AccumulatedDepletionRoyaltyAndStreamInterests" xlink:to="lab_H6460J968H94_mtaff_AccumulatedDepletionRoyaltyAndStreamInterests"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract" xml:lang="en-US">Acquisition-date fair value of total consideration transferred [abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract" xml:lang="en-US">Considerations paid:</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_EquityInterestsOfAcquirer" xlink:label="loc_F4248H746F72_ifrs-full_EquityInterestsOfAcquirer"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_EquityInterestsOfAcquirer" xml:lang="en-US">Equity interests of acquirer</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_EquityInterestsOfAcquirer" xml:lang="en-US">Common shares issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_EquityInterestsOfAcquirer" xml:lang="en-US">Value of common shares issued</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_EquityInterestsOfAcquirer" xlink:to="lab_H6460J968H94_ifrs-full_EquityInterestsOfAcquirer"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ReserveForSharePurchaseWarrants" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ReserveForSharePurchaseWarrants"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ReserveForSharePurchaseWarrants" xml:lang="en-US">Reserve For Share Purchase Warrants</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ReserveForSharePurchaseWarrants" xml:lang="en-US">Reserve for ValGold share purchase warrants</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ReserveForSharePurchaseWarrants" xml:lang="en-US">Reserve For Share Purchase Warrants.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ReserveForSharePurchaseWarrants" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ReserveForSharePurchaseWarrants"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination" xlink:label="loc_F4248H746F72_ifrs-full_AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination" xml:lang="en-US">Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination" xml:lang="en-US">Acquisition costs</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination" xlink:to="lab_H6460J968H94_ifrs-full_AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xml:lang="en-US">Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xml:lang="en-US">Net asset acquired</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TradeAndOtherReceivables" xlink:label="loc_F4248H746F72_ifrs-full_TradeAndOtherReceivables"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_TradeAndOtherReceivables" xml:lang="en-US">Trade and other receivables</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_TradeAndOtherReceivables" xml:lang="en-US">Trade receivables and other</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_TradeAndOtherReceivables" xlink:to="lab_H6460J968H94_ifrs-full_TradeAndOtherReceivables"/>




<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TradeAndOtherPayables" xlink:label="loc_F4248H746F72_ifrs-full_TradeAndOtherPayables"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_TradeAndOtherPayables" xml:lang="en-US">Trade and other payables</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_TradeAndOtherPayables" xml:lang="en-US">Trade payables and accrued liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_H6460J968H94_ifrs-full_TradeAndOtherPayables" xml:lang="en-US">Trade and other payables (Note 6)</label>
<label xlink:type="resource" xlink:label="lab_H6460J968H94_ifrs-full_TradeAndOtherPayables" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xml:lang="en-US">Trade payables and accrued liabilities</label>
<label xlink:type="resource" xlink:label="lab_H6460J968H94_ifrs-full_TradeAndOtherPayables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Accounts payable and accrued liabilities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_TradeAndOtherPayables" xlink:to="lab_H6460J968H94_ifrs-full_TradeAndOtherPayables"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_EndeavorStreamInterestAsOfAcquisitionDate" xlink:label="loc_IF21F453I7K897H8F732_mtaff_EndeavorStreamInterestAsOfAcquisitionDate"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_EndeavorStreamInterestAsOfAcquisitionDate" xml:lang="en-US">Endeavor Stream Interest As Of Acquisition Date</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_EndeavorStreamInterestAsOfAcquisitionDate" xml:lang="en-US">Endeavor stream interest</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_EndeavorStreamInterestAsOfAcquisitionDate" xml:lang="en-US">Endeavor stream interest as of acquisition date.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_EndeavorStreamInterestAsOfAcquisitionDate" xlink:to="lab_KH43H675K9M019J0H954_mtaff_EndeavorStreamInterestAsOfAcquisitionDate"/>





<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate" xml:lang="en-US">Trade and other payables recognised as of acquisition date</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate" xml:lang="en-US">Accounts payable and accrued liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate" xml:lang="en-US">Trade and other payables</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed" xlink:label="loc_F4248H746F72_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed" xml:lang="en-US">Identifiable assets acquired (liabilities assumed)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_H6460J968H94_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed" xml:lang="en-US">Net asset acquired</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed" xlink:to="lab_H6460J968H94_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesAbstract" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesAbstract" xml:lang="en-US">Disclosure of associates [abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesAbstract" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable" xml:lang="en-US">Disclosure of associates [table]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable" xlink:to="lab_H6460J968H94_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DividendsReceived" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DividendsReceived"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DividendsReceived" xml:lang="en-US">Dividends received</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DividendsReceived" xml:lang="en-US">Distribution</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DividendsReceived" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DividendsReceived"/>










<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_LoanPayableTable" xlink:label="loc_F4248H746F72_mtaff_LoanPayableTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_LoanPayableTable" xml:lang="en-US">Loan Payable [Table]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_LoanPayableTable" xml:lang="en-US">Schedule disclosing information related to loan payable.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_LoanPayableTable" xlink:to="lab_H6460J968H94_mtaff_LoanPayableTable"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_LoanPayableAxis" xlink:label="loc_IF21F453I7K897H8F732_mtaff_LoanPayableAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_LoanPayableAxis" xml:lang="en-US">Loan Payable [Axis]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_LoanPayableAxis" xml:lang="en-US">The axis of a table defines the relationship between the domain members or categories in the table and the line items or concepts that complete the table.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_LoanPayableAxis" xlink:to="lab_KH43H675K9M019J0H954_mtaff_LoanPayableAxis"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_LoanPayableDomain" xlink:label="loc_F4248H746F72_mtaff_LoanPayableDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_LoanPayableDomain" xml:lang="en-US">Loan Payable [Domain]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_LoanPayableDomain" xlink:to="lab_H6460J968H94_mtaff_LoanPayableDomain"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_CoeurDebentureMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_CoeurDebentureMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CoeurDebentureMember" xml:lang="en-US">Coeur Debenture [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CoeurDebentureMember" xml:lang="en-US">Coeur debenture</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CoeurDebentureMember" xml:lang="en-US">This member stands for Coeur Debenture.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_CoeurDebentureMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_CoeurDebentureMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_OtherLoanPayableMember" xlink:label="loc_F4248H746F72_mtaff_OtherLoanPayableMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_OtherLoanPayableMember" xml:lang="en-US">Other Loan Payable [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_OtherLoanPayableMember" xml:lang="en-US">Other</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_OtherLoanPayableMember" xml:lang="en-US">This member stands for other loan payable.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_OtherLoanPayableMember" xlink:to="lab_H6460J968H94_mtaff_OtherLoanPayableMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_LoanPayableLineItems" xlink:label="loc_IF21F453I7K897H8F732_mtaff_LoanPayableLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_LoanPayableLineItems" xml:lang="en-US">Loan Payable [Line Items]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_LoanPayableLineItems" xlink:to="lab_KH43H675K9M019J0H954_mtaff_LoanPayableLineItems"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AdditionsToLoanPayable" xlink:label="loc_F4248H746F72_mtaff_AdditionsToLoanPayable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_AdditionsToLoanPayable" xml:lang="en-US">Additions To Loan Payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_AdditionsToLoanPayable" xml:lang="en-US">Additions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_AdditionsToLoanPayable" xml:lang="en-US">Represents amount of additions to loan payable.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_AdditionsToLoanPayable" xlink:to="lab_H6460J968H94_mtaff_AdditionsToLoanPayable"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_InducementsToLoanPayable" xlink:label="loc_IF21F453I7K897H8F732_mtaff_InducementsToLoanPayable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_InducementsToLoanPayable" xml:lang="en-US">Inducements To Loan Payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_InducementsToLoanPayable" xml:lang="en-US">Inducements</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_InducementsToLoanPayable" xml:lang="en-US">Represents amount of inducements to loan payable.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_InducementsToLoanPayable" xlink:to="lab_KH43H675K9M019J0H954_mtaff_InducementsToLoanPayable"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_LoansSettlement" xlink:label="loc_F4248H746F72_mtaff_LoansSettlement"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_LoansSettlement" xml:lang="en-US">Loans Settlement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_LoansSettlement" xml:lang="en-US">Settlements</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_LoansSettlement" xml:lang="en-US">Represents amount of settlements of loan.</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_mtaff_LoansSettlement" xml:lang="en-US">Settlements</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_LoansSettlement" xlink:to="lab_H6460J968H94_mtaff_LoansSettlement"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_CurrencyTranslationAdjustmentsRelatedToBorrowings" xlink:label="loc_IF21F453I7K897H8F732_mtaff_CurrencyTranslationAdjustmentsRelatedToBorrowings"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CurrencyTranslationAdjustmentsRelatedToBorrowings" xml:lang="en-US">Currency Translation Adjustments Related To Borrowings</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CurrencyTranslationAdjustmentsRelatedToBorrowings" xml:lang="en-US">Currency translation adjustments</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_CurrencyTranslationAdjustmentsRelatedToBorrowings" xml:lang="en-US">Represents amount of currency translation adjustments related to borrowing.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_CurrencyTranslationAdjustmentsRelatedToBorrowings" xlink:to="lab_KH43H675K9M019J0H954_mtaff_CurrencyTranslationAdjustmentsRelatedToBorrowings"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_AccountingProfit" xlink:label="loc_F4248H746F72_ifrs-full_AccountingProfit"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_AccountingProfit" xml:lang="en-US">Accounting profit</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_AccountingProfit" xml:lang="en-US">Loss before income taxes</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_H6460J968H94_ifrs-full_AccountingProfit" xml:lang="en-US">Loss before income taxes</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_AccountingProfit" xlink:to="lab_H6460J968H94_ifrs-full_AccountingProfit"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ApplicableTaxRate" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_ApplicableTaxRate"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ApplicableTaxRate" xml:lang="en-US">Applicable tax rate</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_ApplicableTaxRate" xml:lang="en-US">Canadian federal and provincial income tax rates</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_ApplicableTaxRate" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_ApplicableTaxRate"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TaxExpenseIncomeAtApplicableTaxRate" xlink:label="loc_F4248H746F72_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate" xml:lang="en-US">Tax expense (income) at applicable tax rate</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate" xml:lang="en-US">Expected income tax recovery at statutory income tax rate</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate" xlink:to="lab_H6460J968H94_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TaxEffectOfForeignTaxRates" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_TaxEffectOfForeignTaxRates"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_TaxEffectOfForeignTaxRates" xml:lang="en-US">Tax effect of foreign tax rates</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_TaxEffectOfForeignTaxRates" xml:lang="en-US">Difference between Canadian and foreign tax rate</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_TaxEffectOfForeignTaxRates" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_TaxEffectOfForeignTaxRates"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss" xlink:label="loc_F4248H746F72_ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss" xml:lang="en-US">Tax effect of expense not deductible in determining taxable profit (tax loss)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss" xml:lang="en-US">Permanent differences</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss" xlink:to="lab_H6460J968H94_ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xml:lang="en-US">Other tax effects for reconciliation between accounting profit and tax expense (income)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xml:lang="en-US">Other adjustments</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_IncomeTaxExpenseContinuingOperations"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IncomeTaxExpenseContinuingOperations" xml:lang="en-US">Tax expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IncomeTaxExpenseContinuingOperations" xml:lang="en-US">Current income tax expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IncomeTaxExpenseContinuingOperations" xml:lang="en-US">Total income tax expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_IncomeTaxExpenseContinuingOperations" xml:lang="en-US">Current income tax expense</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_IncomeTaxExpenseContinuingOperations"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable" xml:lang="en-US">Disclosure of temporary difference, unused tax losses and unused tax credits [table]</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xml:lang="en-US">Temporary difference, unused tax losses and unused tax credits [axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember" xlink:label="loc_F4248H746F72_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember" xml:lang="en-US">Temporary difference, unused tax losses and unused tax credits [member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember" xlink:to="lab_H6460J968H94_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_MineralExpendituresAndCapitalAssetsMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_MineralExpendituresAndCapitalAssetsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_MineralExpendituresAndCapitalAssetsMember" xml:lang="en-US">Mineral Expenditures And Capital Assets [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_MineralExpendituresAndCapitalAssetsMember" xml:lang="en-US">Mineral expenditures and capital assets</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_MineralExpendituresAndCapitalAssetsMember" xml:lang="en-US">This member stands for Mineral expenditures and capital assets.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_MineralExpendituresAndCapitalAssetsMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_MineralExpendituresAndCapitalAssetsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ShareIssueCostsMember" xlink:label="loc_F4248H746F72_mtaff_ShareIssueCostsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ShareIssueCostsMember" xml:lang="en-US">Share Issue Costs [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_ShareIssueCostsMember" xml:lang="en-US">Share issue costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ShareIssueCostsMember" xml:lang="en-US">This member stands for share issue costs.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ShareIssueCostsMember" xlink:to="lab_H6460J968H94_mtaff_ShareIssueCostsMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NonCapitalLossesAndOtherMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_NonCapitalLossesAndOtherMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NonCapitalLossesAndOtherMember" xml:lang="en-US">Non Capital Losses And Other [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NonCapitalLossesAndOtherMember" xml:lang="en-US">Non-capital losses and others</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NonCapitalLossesAndOtherMember" xml:lang="en-US">This member stands for Non-capital losses and other.</label>
<label xlink:type="resource" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NonCapitalLossesAndOtherMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Non-capital losses and other</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_NonCapitalLossesAndOtherMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_NonCapitalLossesAndOtherMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems" xml:lang="en-US">Disclosure of temporary difference, unused tax losses and unused tax credits [line items]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems" xlink:to="lab_H6460J968H94_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DeferredTaxAssetsAndLiabilitiesAbstract" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DeferredTaxAssetsAndLiabilitiesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DeferredTaxAssetsAndLiabilitiesAbstract" xml:lang="en-US">Deferred tax assets and liabilities [abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DeferredTaxAssetsAndLiabilitiesAbstract" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DeferredTaxAssetsAndLiabilitiesAbstract"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DeferredTaxAssetsAbstract" xlink:label="loc_F4248H746F72_mtaff_DeferredTaxAssetsAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_DeferredTaxAssetsAbstract" xml:lang="en-US">Deferred Tax Assets [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_DeferredTaxAssetsAbstract" xml:lang="en-US">Deferred tax assets:</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_DeferredTaxAssetsAbstract" xlink:to="lab_H6460J968H94_mtaff_DeferredTaxAssetsAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DeferredTaxAssets" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DeferredTaxAssets"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DeferredTaxAssets" xml:lang="en-US">Deferred tax assets</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DeferredTaxAssets" xml:lang="en-US">Deferred tax assets</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DeferredTaxAssets" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DeferredTaxAssets"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" xlink:label="loc_F4248H746F72_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" xml:lang="en-US">Deductible temporary differences for which no deferred tax asset is recognised</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" xml:lang="en-US">Unrecognized deferred tax assets</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" xml:lang="en-US">Unrecognized deferred tax assets</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" xlink:to="lab_H6460J968H94_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DeferredTaxLiabilityAsset" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DeferredTaxLiabilityAsset"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DeferredTaxLiabilityAsset" xml:lang="en-US">Deferred tax liability (asset)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DeferredTaxLiabilityAsset" xml:lang="en-US">Net deferred income tax asset (liability)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DeferredTaxLiabilityAsset" xml:lang="en-US">Net deferred income tax asset (liability)</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DeferredTaxLiabilityAsset" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DeferredTaxLiabilityAsset"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_NumberOfOutstandingShareOptions" xlink:label="loc_F4248H746F72_ifrs-full_NumberOfOutstandingShareOptions"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfOutstandingShareOptions" xml:lang="en-US">Number of share options outstanding</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfOutstandingShareOptions" xml:lang="en-US">Outstanding</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfOutstandingShareOptions" xml:lang="en-US">Balance</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_H6460J968H94_ifrs-full_NumberOfOutstandingShareOptions" xml:lang="en-US">Balance</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_NumberOfOutstandingShareOptions" xlink:to="lab_H6460J968H94_ifrs-full_NumberOfOutstandingShareOptions"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_NumberOfShareOptionsExpiredInSharebasedPaymentArrangement" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_NumberOfShareOptionsExpiredInSharebasedPaymentArrangement"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_NumberOfShareOptionsExpiredInSharebasedPaymentArrangement" xml:lang="en-US">Number of share options expired in share-based payment arrangement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_NumberOfShareOptionsExpiredInSharebasedPaymentArrangement" xml:lang="en-US">Expired/Cancelled</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_NumberOfShareOptionsExpiredInSharebasedPaymentArrangement" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_NumberOfShareOptionsExpiredInSharebasedPaymentArrangement"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement" xlink:label="loc_F4248H746F72_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement" xml:lang="en-US">Weighted average exercise price of share options outstanding in share-based payment arrangement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_H6460J968H94_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement" xml:lang="en-US">Weighted average exercise price, Balance</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_H6460J968H94_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement" xml:lang="en-US">Weighted average exercise price, Balance</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement" xlink:to="lab_H6460J968H94_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement" xml:lang="en-US">Granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement" xml:lang="en-US">Weighted average exercise price, Granted</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement" xlink:label="loc_F4248H746F72_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement" xml:lang="en-US">Weighted average exercise price of share options exercised in share-based payment arrangement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement" xml:lang="en-US">Exercised</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement" xml:lang="en-US">Weighted average exercise price, Exercised</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement" xlink:to="lab_H6460J968H94_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement" xml:lang="en-US">Weighted average exercise price of share options expired in share-based payment arrangement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement" xml:lang="en-US">Expired/cancelled</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement" xml:lang="en-US">Weighted average exercise price, Expired/Cancelled</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable" xlink:label="loc_F4248H746F72_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable" xml:lang="en-US">Disclosure of range of exercise prices of outstanding share options [table]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable" xlink:to="lab_H6460J968H94_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateAxis" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateAxis" xml:lang="en-US">Expiry Date [Axis]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateAxis" xml:lang="en-US">The axis of a table defines the relationship between the domain members or categories in the table and the line items or concepts that complete the table.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateAxis" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateAxis"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateDomain" xlink:label="loc_F4248H746F72_mtaff_ExpiryDateDomain"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateDomain" xml:lang="en-US">Expiry Date [Domain]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateDomain" xml:lang="en-US">Definition :
It represents expiry date.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ExpiryDateDomain" xlink:to="lab_H6460J968H94_mtaff_ExpiryDateDomain"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateJul152021Member" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateJul152021Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateJul152021Member" xml:lang="en-US">Expiry Date Jul 15, 2021 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateJul152021Member" xml:lang="en-US">Jul 15, 2021</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateJul152021Member" xml:lang="en-US">It indicates expiry date as Jul 15, 2021.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateJul152021Member" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateJul152021Member"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateNov152021Member" xlink:label="loc_F4248H746F72_mtaff_ExpiryDateNov152021Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateNov152021Member" xml:lang="en-US">Expiry Date Nov 15, 2021 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateNov152021Member" xml:lang="en-US">Nov 15, 2021</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateNov152021Member" xml:lang="en-US">It indicates expiry date as Nov 15, 2021.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ExpiryDateNov152021Member" xlink:to="lab_H6460J968H94_mtaff_ExpiryDateNov152021Member"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateNov302021Member" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateNov302021Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateNov302021Member" xml:lang="en-US">Expiry Date Nov 30, 2021 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateNov302021Member" xml:lang="en-US">Nov 30, 2021</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateNov302021Member" xml:lang="en-US">It indicates expiry date as Nov 30, 2021.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateNov302021Member" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateNov302021Member"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateMar062022Member" xlink:label="loc_F4248H746F72_mtaff_ExpiryDateMar062022Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateMar062022Member" xml:lang="en-US">Expiry Date Mar 06, 2022 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateMar062022Member" xml:lang="en-US">Mar 06, 2022</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateMar062022Member" xml:lang="en-US">It indicates expiry date as Mar 06, 2022.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ExpiryDateMar062022Member" xlink:to="lab_H6460J968H94_mtaff_ExpiryDateMar062022Member"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateJul312022Member" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateJul312022Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateJul312022Member" xml:lang="en-US">Expiry Date Jul 31, 2022 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateJul312022Member" xml:lang="en-US">Jul 31, 2022</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateJul312022Member" xml:lang="en-US">It indicates expiry date as Jul 31, 2022.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateJul312022Member" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateJul312022Member"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateMar012023Member" xlink:label="loc_F4248H746F72_mtaff_ExpiryDateMar012023Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateMar012023Member" xml:lang="en-US">Expiry Date Mar 01, 2023 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateMar012023Member" xml:lang="en-US">Mar 01, 2023</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateMar012023Member" xml:lang="en-US">It indicates expiry date as Mar 01, 2023.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ExpiryDateMar012023Member" xlink:to="lab_H6460J968H94_mtaff_ExpiryDateMar012023Member"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateSep182023Member" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateSep182023Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateSep182023Member" xml:lang="en-US">Expiry Date Sep 18 2023 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateSep182023Member" xml:lang="en-US">Sep 18, 2023</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateSep182023Member" xml:lang="en-US">It indicates expiry date as Sep 18, 2023.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateSep182023Member" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateSep182023Member"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateJan042024Member" xlink:label="loc_F4248H746F72_mtaff_ExpiryDateJan042024Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateJan042024Member" xml:lang="en-US">Expiry Date Jan 04 2024 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateJan042024Member" xml:lang="en-US">Jan 04, 2024</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateJan042024Member" xml:lang="en-US">It indicates expiry date as Jan 04, 2024	.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ExpiryDateJan042024Member" xlink:to="lab_H6460J968H94_mtaff_ExpiryDateJan042024Member"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems" xml:lang="en-US">Disclosure of range of exercise prices of outstanding share options [line items]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ExercisePriceOfOutstandingShareOptions" xlink:label="loc_F4248H746F72_ifrs-full_ExercisePriceOfOutstandingShareOptions"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_ExercisePriceOfOutstandingShareOptions" xml:lang="en-US">Exercise price</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_ExercisePriceOfOutstandingShareOptions" xml:lang="en-US">Exercise price</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_ExercisePriceOfOutstandingShareOptions" xlink:to="lab_H6460J968H94_ifrs-full_ExercisePriceOfOutstandingShareOptions"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfOutstandingWarrants" xlink:label="loc_IF21F453I7K897H8F732_mtaff_NumberOfOutstandingWarrants"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfOutstandingWarrants" xml:lang="en-US">Number Of Outstanding Warrants</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfOutstandingWarrants" xml:lang="en-US">Outstanding</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfOutstandingWarrants" xml:lang="en-US">Balance</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfOutstandingWarrants" xml:lang="en-US">Balance</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfOutstandingWarrants" xml:lang="en-US">Number of warrants outstanding in share-based payment arrangement at beginning of period.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_NumberOfOutstandingWarrants" xlink:to="lab_KH43H675K9M019J0H954_mtaff_NumberOfOutstandingWarrants"/>






<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfWarrantsExercised" xlink:label="loc_IF21F453I7K897H8F732_mtaff_NumberOfWarrantsExercised"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfWarrantsExercised" xml:lang="en-US">Number Of Warrants Exercised</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfWarrantsExercised" xml:lang="en-US">Exercise of share purchase and finder's warrants</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfWarrantsExercised" xml:lang="en-US">It represents as a number of warrants exercised.</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_NumberOfWarrantsExercised" xml:lang="en-US">Exercised</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_NumberOfWarrantsExercised" xlink:to="lab_KH43H675K9M019J0H954_mtaff_NumberOfWarrantsExercised"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfWarrantsExpired" xlink:label="loc_F4248H746F72_mtaff_NumberOfWarrantsExpired"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_NumberOfWarrantsExpired" xml:lang="en-US">Number Of Warrants Expired</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_NumberOfWarrantsExpired" xml:lang="en-US">Expired/Cancelled</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_NumberOfWarrantsExpired" xml:lang="en-US">It represents as a number of warrants expired.</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_mtaff_NumberOfWarrantsExpired" xml:lang="en-US">Expired/Cancelled</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_NumberOfWarrantsExpired" xlink:to="lab_H6460J968H94_mtaff_NumberOfWarrantsExpired"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_WeightedAverageExercisePriceOfWarrantsOutstanding" xlink:label="loc_IF21F453I7K897H8F732_mtaff_WeightedAverageExercisePriceOfWarrantsOutstanding"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WeightedAverageExercisePriceOfWarrantsOutstanding" xml:lang="en-US">Weighted Average Exercise Price Of Warrants Outstanding</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WeightedAverageExercisePriceOfWarrantsOutstanding" xml:lang="en-US">Weighted average exercise price of warrants outstanding</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WeightedAverageExercisePriceOfWarrantsOutstanding" xml:lang="en-US">Weighted average exercise price of warrants outstanding</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WeightedAverageExercisePriceOfWarrantsOutstanding" xml:lang="en-US">Weighted average exercise price of warrants outstanding in share-based payment arrangement at beginning of period.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_WeightedAverageExercisePriceOfWarrantsOutstanding" xlink:to="lab_KH43H675K9M019J0H954_mtaff_WeightedAverageExercisePriceOfWarrantsOutstanding"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_WeightedAverageExercisePriceOfWarrantsExercised" xlink:label="loc_F4248H746F72_mtaff_WeightedAverageExercisePriceOfWarrantsExercised"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_WeightedAverageExercisePriceOfWarrantsExercised" xml:lang="en-US">Weighted Average Exercise Price Of Warrants Exercised</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_WeightedAverageExercisePriceOfWarrantsExercised" xml:lang="en-US">Weighted average exercise price of warrants, Exercised</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_WeightedAverageExercisePriceOfWarrantsExercised" xml:lang="en-US">It represents as a amount of warrants exercised.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_WeightedAverageExercisePriceOfWarrantsExercised" xlink:to="lab_H6460J968H94_mtaff_WeightedAverageExercisePriceOfWarrantsExercised"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_WeightedAverageExercisePriceOfWarrantsExpired" xlink:label="loc_IF21F453I7K897H8F732_mtaff_WeightedAverageExercisePriceOfWarrantsExpired"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WeightedAverageExercisePriceOfWarrantsExpired" xml:lang="en-US">Weighted Average Exercise Price Of Warrants Expired</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WeightedAverageExercisePriceOfWarrantsExpired" xml:lang="en-US">Weighted average exercise price of warrants, Expired/Cancelled</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WeightedAverageExercisePriceOfWarrantsExpired" xml:lang="en-US">It represents as a amount of warrants expired.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_WeightedAverageExercisePriceOfWarrantsExpired" xlink:to="lab_KH43H675K9M019J0H954_mtaff_WeightedAverageExercisePriceOfWarrantsExpired"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ScheduleOfWarrantTable" xlink:label="loc_F4248H746F72_mtaff_ScheduleOfWarrantTable"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ScheduleOfWarrantTable" xml:lang="en-US">Schedule Of Warrant [Table]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ScheduleOfWarrantTable" xml:lang="en-US">Schedule disclosing information related to warrant.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ScheduleOfWarrantTable" xlink:to="lab_H6460J968H94_mtaff_ScheduleOfWarrantTable"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateOctober062019Member" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateOctober062019Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateOctober062019Member" xml:lang="en-US">Expiry Date October 06 2019 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateOctober062019Member" xml:lang="en-US">Oct 06, 2019</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateOctober062019Member" xml:lang="en-US">It indicates expiry date as Oct 06, 2019	.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateOctober062019Member" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateOctober062019Member"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateNovember082020Member" xlink:label="loc_F4248H746F72_mtaff_ExpiryDateNovember082020Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateNovember082020Member" xml:lang="en-US">Expiry Date November 08 2020 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateNovember082020Member" xml:lang="en-US">Nov 08, 2020</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateNovember082020Member" xml:lang="en-US">It indicates expiry date as Nov 08, 2020.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ExpiryDateNovember082020Member" xlink:to="lab_H6460J968H94_mtaff_ExpiryDateNovember082020Member"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateDecember052020Member" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateDecember052020Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateDecember052020Member" xml:lang="en-US">Expiry Date December 05 2020 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateDecember052020Member" xml:lang="en-US">Dec 05, 2020</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateDecember052020Member" xml:lang="en-US">It indicates expiry date as Dec 05, 2020.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateDecember052020Member" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateDecember052020Member"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateDecember212020Member" xlink:label="loc_F4248H746F72_mtaff_ExpiryDateDecember212020Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateDecember212020Member" xml:lang="en-US">Expiry Date December 21 2020 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateDecember212020Member" xml:lang="en-US">Dec 21, 2020</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateDecember212020Member" xml:lang="en-US">It indicates expiry date as Dec 21, 2020.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ExpiryDateDecember212020Member" xlink:to="lab_H6460J968H94_mtaff_ExpiryDateDecember212020Member"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateJanuary042021Member" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateJanuary042021Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateJanuary042021Member" xml:lang="en-US">Expiry Date January 04 2021 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateJanuary042021Member" xml:lang="en-US">Jan 04, 2021</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateJanuary042021Member" xml:lang="en-US">It indicates expiry date as Jan 04, 2021	.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateJanuary042021Member" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateJanuary042021Member"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateAugust112021Member" xlink:label="loc_F4248H746F72_mtaff_ExpiryDateAugust112021Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateAugust112021Member" xml:lang="en-US">Expiry Date August 11, 2021 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateAugust112021Member" xml:lang="en-US">Aug 11, 2021</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateAugust112021Member" xml:lang="en-US">Aug 11, 2021</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ExpiryDateAugust112021Member" xml:lang="en-US">It indicates expiry date as Aug 11, 2021.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ExpiryDateAugust112021Member" xlink:to="lab_H6460J968H94_mtaff_ExpiryDateAugust112021Member"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpiryDateAugust302021Member" xlink:label="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateAugust302021Member"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateAugust302021Member" xml:lang="en-US">Expiry Date August 30, 2021 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateAugust302021Member" xml:lang="en-US">Aug 30, 2021</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateAugust302021Member" xml:lang="en-US">Aug 30, 2021</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateAugust302021Member" xml:lang="en-US">It indicates expiry date as Aug 30, 2021.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_ExpiryDateAugust302021Member" xlink:to="lab_KH43H675K9M019J0H954_mtaff_ExpiryDateAugust302021Member"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ScheduleOfWarrantLineItems" xlink:label="loc_F4248H746F72_mtaff_ScheduleOfWarrantLineItems"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_mtaff_ScheduleOfWarrantLineItems" xml:lang="en-US">Schedule Of Warrant [Line Items]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_H6460J968H94_mtaff_ScheduleOfWarrantLineItems" xml:lang="en-US">Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_mtaff_ScheduleOfWarrantLineItems" xlink:to="lab_H6460J968H94_mtaff_ScheduleOfWarrantLineItems"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_WarrantsExercisePrice" xlink:label="loc_IF21F453I7K897H8F732_mtaff_WarrantsExercisePrice"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WarrantsExercisePrice" xml:lang="en-US">Warrants Exercise Price</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WarrantsExercisePrice" xml:lang="en-US">Warrants exercise price</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_WarrantsExercisePrice" xml:lang="en-US">It represents as a exercise price of warrants.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_WarrantsExercisePrice" xlink:to="lab_KH43H675K9M019J0H954_mtaff_WarrantsExercisePrice"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_KeyManagementPersonnelOfEntityOrParentMember" xlink:label="loc_F4248H746F72_ifrs-full_KeyManagementPersonnelOfEntityOrParentMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_KeyManagementPersonnelOfEntityOrParentMember" xml:lang="en-US">Key management personnel of entity or parent [member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_KeyManagementPersonnelOfEntityOrParentMember" xml:lang="en-US">Management</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_KeyManagementPersonnelOfEntityOrParentMember" xlink:to="lab_H6460J968H94_ifrs-full_KeyManagementPersonnelOfEntityOrParentMember"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DirectorsMember" xlink:label="loc_IF21F453I7K897H8F732_mtaff_DirectorsMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DirectorsMember" xml:lang="en-US">Directors [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DirectorsMember" xml:lang="en-US">Directors</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_KH43H675K9M019J0H954_mtaff_DirectorsMember" xml:lang="en-US">Person serving on the board of directors (who collectively have responsibility for governing the entity).</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_mtaff_DirectorsMember" xlink:to="lab_KH43H675K9M019J0H954_mtaff_DirectorsMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xlink:label="loc_F4248H746F72_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xml:lang="en-US">Key management personnel compensation, short-term employee benefits</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xml:lang="en-US">Salary or fees</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xlink:to="lab_H6460J968H94_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xml:lang="en-US">Key management personnel compensation, share-based payment</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xml:lang="en-US">Share-based payments</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_KeyManagementPersonnelCompensation" xlink:label="loc_F4248H746F72_ifrs-full_KeyManagementPersonnelCompensation"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_KeyManagementPersonnelCompensation" xml:lang="en-US">Key management personnel compensation</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_H6460J968H94_ifrs-full_KeyManagementPersonnelCompensation" xml:lang="en-US">Total</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_KeyManagementPersonnelCompensation" xlink:to="lab_H6460J968H94_ifrs-full_KeyManagementPersonnelCompensation"/>















<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CategoriesOfFinancialAssetsAbstract" xlink:label="loc_F4248H746F72_ifrs-full_CategoriesOfFinancialAssetsAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_CategoriesOfFinancialAssetsAbstract" xml:lang="en-US">Categories of financial assets [abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_CategoriesOfFinancialAssetsAbstract" xml:lang="en-US">Financial assets</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_CategoriesOfFinancialAssetsAbstract" xlink:to="lab_H6460J968H94_ifrs-full_CategoriesOfFinancialAssetsAbstract"/>




<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CurrentFinancialAssetsAtFairValueThroughProfitOrLossAbstract" xlink:label="loc_F4248H746F72_ifrs-full_CurrentFinancialAssetsAtFairValueThroughProfitOrLossAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_CurrentFinancialAssetsAtFairValueThroughProfitOrLossAbstract" xml:lang="en-US">Current financial assets at fair value through profit or loss [abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_CurrentFinancialAssetsAtFairValueThroughProfitOrLossAbstract" xml:lang="en-US">Fair value through profit or loss:</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_CurrentFinancialAssetsAtFairValueThroughProfitOrLossAbstract" xlink:to="lab_H6460J968H94_ifrs-full_CurrentFinancialAssetsAtFairValueThroughProfitOrLossAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_FinancialAssetsAtFairValue" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_FinancialAssetsAtFairValue"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_FinancialAssetsAtFairValue" xml:lang="en-US">Financial assets, at fair value</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_FinancialAssetsAtFairValue" xml:lang="en-US">Financial assets, at fair value</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_FinancialAssetsAtFairValue" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_FinancialAssetsAtFairValue"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesAbstract" xlink:label="loc_F4248H746F72_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract" xml:lang="en-US">Categories of financial liabilities [abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract" xml:lang="en-US">Financial liabilities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract" xlink:to="lab_H6460J968H94_ifrs-full_CategoriesOfFinancialLiabilitiesAbstract"/>















<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_FinancialLiabilitiesAtAmortisedCost" xlink:label="loc_F4248H746F72_ifrs-full_FinancialLiabilitiesAtAmortisedCost"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_FinancialLiabilitiesAtAmortisedCost" xml:lang="en-US">Financial liabilities at amortised cost</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_H6460J968H94_ifrs-full_FinancialLiabilitiesAtAmortisedCost" xml:lang="en-US">Financial liabilities, at fair value</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_FinancialLiabilitiesAtAmortisedCost" xlink:to="lab_H6460J968H94_ifrs-full_FinancialLiabilitiesAtAmortisedCost"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_LevelsOfFairValueHierarchyAxis"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_LevelsOfFairValueHierarchyAxis" xml:lang="en-US">Levels of fair value hierarchy [axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_LevelsOfFairValueHierarchyAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_AllLevelsOfFairValueHierarchyMember" xlink:label="loc_F4248H746F72_ifrs-full_AllLevelsOfFairValueHierarchyMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_AllLevelsOfFairValueHierarchyMember" xml:lang="en-US">All levels of fair value hierarchy [member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_AllLevelsOfFairValueHierarchyMember" xlink:to="lab_H6460J968H94_ifrs-full_AllLevelsOfFairValueHierarchyMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_Level1OfFairValueHierarchyMember" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_Level1OfFairValueHierarchyMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_Level1OfFairValueHierarchyMember" xml:lang="en-US">Level 1 of fair value hierarchy [member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_Level1OfFairValueHierarchyMember" xml:lang="en-US">Level 1</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_Level1OfFairValueHierarchyMember" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_Level1OfFairValueHierarchyMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_Level2OfFairValueHierarchyMember" xlink:label="loc_F4248H746F72_ifrs-full_Level2OfFairValueHierarchyMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_Level2OfFairValueHierarchyMember" xml:lang="en-US">Level 2 of fair value hierarchy [member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_H6460J968H94_ifrs-full_Level2OfFairValueHierarchyMember" xml:lang="en-US">Level 2</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_Level2OfFairValueHierarchyMember" xlink:to="lab_H6460J968H94_ifrs-full_Level2OfFairValueHierarchyMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_Level3OfFairValueHierarchyMember" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_Level3OfFairValueHierarchyMember"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_Level3OfFairValueHierarchyMember" xml:lang="en-US">Level 3 of fair value hierarchy [member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_Level3OfFairValueHierarchyMember" xml:lang="en-US">Level 3</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_Level3OfFairValueHierarchyMember" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_Level3OfFairValueHierarchyMember"/>


















<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_TradeAndOtherPayablesAbstract" xlink:label="loc_IF21F453I7K897H8F732_ifrs-full_TradeAndOtherPayablesAbstract"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_KH43H675K9M019J0H954_ifrs-full_TradeAndOtherPayablesAbstract" xml:lang="en-US">Trade and other payables [abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_IF21F453I7K897H8F732_ifrs-full_TradeAndOtherPayablesAbstract" xlink:to="lab_KH43H675K9M019J0H954_ifrs-full_TradeAndOtherPayablesAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CurrentTaxLiabilitiesCurrent" xlink:label="loc_F4248H746F72_ifrs-full_CurrentTaxLiabilitiesCurrent"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_H6460J968H94_ifrs-full_CurrentTaxLiabilitiesCurrent" xml:lang="en-US">Current tax liabilities, current</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_H6460J968H94_ifrs-full_CurrentTaxLiabilitiesCurrent" xml:lang="en-US">Income taxes payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_H6460J968H94_ifrs-full_CurrentTaxLiabilitiesCurrent" xml:lang="en-US">Income taxes payable</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_F4248H746F72_ifrs-full_CurrentTaxLiabilitiesCurrent" xlink:to="lab_H6460J968H94_ifrs-full_CurrentTaxLiabilitiesCurrent"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AdjustmentsOfItemsNotAffectingCash" xlink:label="loc_mtaff_AdjustmentsOfItemsNotAffectingCash_1"/>
<label xlink:type="resource" xlink:label="lab_mtaff_AdjustmentsOfItemsNotAffectingCash" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Adjustments Of Items Not Affecting Cash</label>

<label xlink:type="resource" xlink:label="lab_mtaff_AdjustmentsOfItemsNotAffectingCash" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Adjustments of items not affecting cash</label>
<label xlink:type="resource" xlink:label="lab_mtaff_AdjustmentsOfItemsNotAffectingCash" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xml:lang="en-US">Total items not affecting cash before changes in non-cash working capital items</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_AdjustmentsOfItemsNotAffectingCash_1" xlink:to="lab_mtaff_AdjustmentsOfItemsNotAffectingCash"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mtaff_AdjustmentsOfItemsNotAffectingCash" xml:lang="en-US">Amount of adjustments for items not affecting cash.</label>

<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ValueOfUnderwriterWarrantsIssued" xlink:label="loc_mtaff_ValueOfUnderwriterWarrantsIssued_1"/>
<label xlink:type="resource" xlink:label="lab_mtaff_ValueOfUnderwriterWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Value Of Underwriter Warrants Issued</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ValueOfUnderwriterWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Value of underwriter warrants issued</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_ValueOfUnderwriterWarrantsIssued_1" xlink:to="lab_mtaff_ValueOfUnderwriterWarrantsIssued"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mtaff_ValueOfUnderwriterWarrantsIssued" xml:lang="en-US">Represents value of underwriter warrants issued.</label>

<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_WeightedAverageExercisePriceOfUnderwritersWarrantsIssued" xlink:label="loc_mtaff_WeightedAverageExercisePriceOfUnderwritersWarrantsIssued_1"/>
<label xlink:type="resource" xlink:label="lab_mtaff_WeightedAverageExercisePriceOfUnderwritersWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Weighted Average Exercise Price Of Underwriters Warrants Issued</label>
<label xlink:type="resource" xlink:label="lab_mtaff_WeightedAverageExercisePriceOfUnderwritersWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Weighted average exercise price of underwriter warrants, Issued</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_WeightedAverageExercisePriceOfUnderwritersWarrantsIssued_1" xlink:to="lab_mtaff_WeightedAverageExercisePriceOfUnderwritersWarrantsIssued"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mtaff_WeightedAverageExercisePriceOfUnderwritersWarrantsIssued" xml:lang="en-US">It represents as a amount of underwriters warrants issued.</label>

<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_OtherAdditionsRoyaltyAndStreamInterests" xlink:label="loc_mtaff_OtherAdditionsRoyaltyAndStreamInterests_1"/>
<label xlink:type="resource" xlink:label="lab_mtaff_OtherAdditionsRoyaltyAndStreamInterests" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Other Additions Royalty And Stream Interests</label>
<label xlink:type="resource" xlink:label="lab_mtaff_OtherAdditionsRoyaltyAndStreamInterests" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Other additions</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_OtherAdditionsRoyaltyAndStreamInterests_1" xlink:to="lab_mtaff_OtherAdditionsRoyaltyAndStreamInterests"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mtaff_OtherAdditionsRoyaltyAndStreamInterests" xml:lang="en-US">Amount of other additions in royalty and stream interests.</label>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DescriptionOfAccountingStandardsAdoptedDuringTheYearPolicyTextBlock" xlink:label="loc_mtaff_DescriptionOfAccountingStandardsAdoptedDuringTheYearPolicyTextBlock"/>
<label xlink:type="resource" xlink:label="lab_mtaff_DescriptionOfAccountingStandardsAdoptedDuringTheYearPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Description Of Accounting Standards Adopted During The Year [Policy Text Block]</label>
<label xlink:type="resource" xlink:label="lab_mtaff_DescriptionOfAccountingStandardsAdoptedDuringTheYearPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xml:lang="en-US">The disclosure of accounting standards adopted during the year.</label>
<label xlink:type="resource" xlink:label="lab_mtaff_DescriptionOfAccountingStandardsAdoptedDuringTheYearPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Accounting standards adopted during the year</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_DescriptionOfAccountingStandardsAdoptedDuringTheYearPolicyTextBlock" xlink:to="lab_mtaff_DescriptionOfAccountingStandardsAdoptedDuringTheYearPolicyTextBlock"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ConvertibleLoanFacilityDrewDown" xlink:label="loc_mtaff_ConvertibleLoanFacilityDrewDown_1"/>
<label xlink:type="resource" xlink:label="lab_mtaff_ConvertibleLoanFacilityDrewDown" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Convertible Loan Facility Drew Down</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ConvertibleLoanFacilityDrewDown" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Initial advance drew down on facility</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_ConvertibleLoanFacilityDrewDown_1" xlink:to="lab_mtaff_ConvertibleLoanFacilityDrewDown"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mtaff_ConvertibleLoanFacilityDrewDown" xml:lang="en-US">The amount of convertible loan facility drew down.</label>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_TermOfConvertibleDebenturePayable" xlink:label="loc_mtaff_TermOfConvertibleDebenturePayable"/>
<label xlink:type="resource" xlink:label="lab_mtaff_TermOfConvertibleDebenturePayable" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Term Of Convertible Debenture Payable</label>
<label xlink:type="resource" xlink:label="lab_mtaff_TermOfConvertibleDebenturePayable" xlink:role="http://www.xbrl.org/2003/role/documentation" xml:lang="en-US">Represent the term of convertible debenture payable.</label>
<label xlink:type="resource" xlink:label="lab_mtaff_TermOfConvertibleDebenturePayable" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Terms of loan aggregate</label>
<label xlink:type="resource" xlink:label="lab_mtaff_TermOfConvertibleDebenturePayable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Term of convertible debenture payable</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_TermOfConvertibleDebenturePayable" xlink:to="lab_mtaff_TermOfConvertibleDebenturePayable"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory"/>
<label xlink:type="resource" xlink:label="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Disclosure of range of exercise prices of outstanding share options [text block]</label>
<label xlink:type="resource" xlink:label="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Schedule of range of exercise prices of outstanding share options</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_DisclosureOfRangeOfExercisePricesOfOutstandingWarrantsExplanatoryTableTextBlock" xlink:label="loc_mtaff_DisclosureOfRangeOfExercisePricesOfOutstandingWarrantsExplanatoryTableTextBlock_1"/>
<label xlink:type="resource" xlink:label="lab_mtaff_DisclosureOfRangeOfExercisePricesOfOutstandingWarrantsExplanatoryTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Disclosure Of Range Of Exercise Prices Of Outstanding Warrants Explanatory [Table Text Block]</label>
<label xlink:type="resource" xlink:label="lab_mtaff_DisclosureOfRangeOfExercisePricesOfOutstandingWarrantsExplanatoryTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Schedule of range of exercise prices of outstanding warrants</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_DisclosureOfRangeOfExercisePricesOfOutstandingWarrantsExplanatoryTableTextBlock_1" xlink:to="lab_mtaff_DisclosureOfRangeOfExercisePricesOfOutstandingWarrantsExplanatoryTableTextBlock"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mtaff_DisclosureOfRangeOfExercisePricesOfOutstandingWarrantsExplanatoryTableTextBlock" xml:lang="en-US">The disclosure of range of exercise prices of outstanding warrants explanatory.</label>

<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_TaxEffectOfChangesInUnrecognizedDeferredTaxAssets" xlink:label="loc_mtaff_TaxEffectOfChangesInUnrecognizedDeferredTaxAssets_1"/>
<label xlink:type="resource" xlink:label="lab_mtaff_TaxEffectOfChangesInUnrecognizedDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Tax Effect Of Changes In Unrecognized Deferred Tax Assets</label>
<label xlink:type="resource" xlink:label="lab_mtaff_TaxEffectOfChangesInUnrecognizedDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Changes in unrecognized deferred tax assets</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_TaxEffectOfChangesInUnrecognizedDeferredTaxAssets_1" xlink:to="lab_mtaff_TaxEffectOfChangesInUnrecognizedDeferredTaxAssets"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mtaff_TaxEffectOfChangesInUnrecognizedDeferredTaxAssets" xml:lang="en-US">Amount of tax effect of changes in unrecognized deferred tax assets.</label>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_HalfOfNetSmelterReturnAcquiredPercentage" xlink:label="loc_mtaff_HalfOfNetSmelterReturnAcquiredPercentage_1"/>
<label xlink:type="resource" xlink:label="lab_mtaff_HalfOfNetSmelterReturnAcquiredPercentage" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Half Of Net Smelter Return Acquired Percentage</label>
<label xlink:type="resource" xlink:label="lab_mtaff_HalfOfNetSmelterReturnAcquiredPercentage" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Half of the NSR royalty</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_HalfOfNetSmelterReturnAcquiredPercentage_1" xlink:to="lab_mtaff_HalfOfNetSmelterReturnAcquiredPercentage"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mtaff_HalfOfNetSmelterReturnAcquiredPercentage" xml:lang="en-US">Represents the percentage of half of net smelter return acquired.</label>

<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_RightOfFirstRefusal" xlink:label="loc_mtaff_RightOfFirstRefusal_1"/>
<label xlink:type="resource" xlink:label="lab_mtaff_RightOfFirstRefusal" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Right Of First Refusal</label>
<label xlink:type="resource" xlink:label="lab_mtaff_RightOfFirstRefusal" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Right of first refusal</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_RightOfFirstRefusal_1" xlink:to="lab_mtaff_RightOfFirstRefusal"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mtaff_RightOfFirstRefusal" xml:lang="en-US">The amount of right of first refusal.</label>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_UpfrontPaymentMadeUponExerciseOfOption" xlink:label="loc_mtaff_UpfrontPaymentMadeUponExerciseOfOption"/>
<label xlink:type="resource" xlink:label="lab_mtaff_UpfrontPaymentMadeUponExerciseOfOption" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Upfront Payment Made Upon Exercise Of Option</label>
<label xlink:type="resource" xlink:label="lab_mtaff_UpfrontPaymentMadeUponExerciseOfOption" xlink:role="http://www.xbrl.org/2003/role/documentation" xml:lang="en-US">The amount of upfront payment made upon exercise of option.</label>
<label xlink:type="resource" xlink:label="lab_mtaff_UpfrontPaymentMadeUponExerciseOfOption" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Upfront payment made upon exercise of option</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_UpfrontPaymentMadeUponExerciseOfOption" xlink:to="lab_mtaff_UpfrontPaymentMadeUponExerciseOfOption"/>







<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_WeightedAverageFairValueOfWarrants" xlink:label="loc_mtaff_WeightedAverageFairValueOfWarrants_1"/>
<label xlink:type="resource" xlink:label="lab_mtaff_WeightedAverageFairValueOfWarrants" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Weighted Average Fair Value Of Warrants</label>
<label xlink:type="resource" xlink:label="lab_mtaff_WeightedAverageFairValueOfWarrants" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Weighted average fair value of warrants</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_WeightedAverageFairValueOfWarrants_1" xlink:to="lab_mtaff_WeightedAverageFairValueOfWarrants"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mtaff_WeightedAverageFairValueOfWarrants" xml:lang="en-US">Represents the weighted average fair value of warrants.</label>





<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_RiskFreeInterestRateWarrantsGranted" xlink:label="loc_mtaff_RiskFreeInterestRateWarrantsGranted"/>
<label xlink:type="resource" xlink:label="lab_mtaff_RiskFreeInterestRateWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Risk Free Interest Rate Warrants Granted</label>
<label xlink:type="resource" xlink:label="lab_mtaff_RiskFreeInterestRateWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/documentation" xml:lang="en-US">Represents the risk free interest rate of warrants granted.</label>
<label xlink:type="resource" xlink:label="lab_mtaff_RiskFreeInterestRateWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Risk free interest rate</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_RiskFreeInterestRateWarrantsGranted" xlink:to="lab_mtaff_RiskFreeInterestRateWarrantsGranted"/>




<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpectedDividendAsPercentageWarrantsGranted" xlink:label="loc_mtaff_ExpectedDividendAsPercentageWarrantsGranted"/>
<label xlink:type="resource" xlink:label="lab_mtaff_ExpectedDividendAsPercentageWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Expected Dividend As Percentage Warrants Granted</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ExpectedDividendAsPercentageWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/documentation" xml:lang="en-US">The percentage of an expected dividend used to calculate the fair value of warrants granted.</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ExpectedDividendAsPercentageWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Expected dividend yield</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_ExpectedDividendAsPercentageWarrantsGranted" xlink:to="lab_mtaff_ExpectedDividendAsPercentageWarrantsGranted"/>




<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpectedVolatilityWarrantsGranted" xlink:label="loc_mtaff_ExpectedVolatilityWarrantsGranted"/>
<label xlink:type="resource" xlink:label="lab_mtaff_ExpectedVolatilityWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Expected Volatility Warrants Granted</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ExpectedVolatilityWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/documentation" xml:lang="en-US">Represents expected volatility of warrants granted.</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ExpectedVolatilityWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Expected stock price volatility</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_ExpectedVolatilityWarrantsGranted" xlink:to="lab_mtaff_ExpectedVolatilityWarrantsGranted"/>




<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExpectedLifeOfWarrantsGranted" xlink:label="loc_mtaff_ExpectedLifeOfWarrantsGranted"/>
<label xlink:type="resource" xlink:label="lab_mtaff_ExpectedLifeOfWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Expected Life Of Warrants Granted</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ExpectedLifeOfWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/documentation" xml:lang="en-US">Expected life of warrants granted.</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ExpectedLifeOfWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Expected life in years</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_ExpectedLifeOfWarrantsGranted" xlink:to="lab_mtaff_ExpectedLifeOfWarrantsGranted"/>




<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_WarrantsForfeitureRate" xlink:label="loc_mtaff_WarrantsForfeitureRate"/>
<label xlink:type="resource" xlink:label="lab_mtaff_WarrantsForfeitureRate" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Warrants Forfeiture Rate</label>
<label xlink:type="resource" xlink:label="lab_mtaff_WarrantsForfeitureRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xml:lang="en-US">The forfeiture rate of warrants.</label>
<label xlink:type="resource" xlink:label="lab_mtaff_WarrantsForfeitureRate" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Forfeiture rate</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_WarrantsForfeitureRate" xlink:to="lab_mtaff_WarrantsForfeitureRate"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfWarrantsIssued" xlink:label="loc_mtaff_NumberOfWarrantsIssued"/>
<label xlink:type="resource" xlink:label="lab_mtaff_NumberOfWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Number Of Warrants Issued</label>
<label xlink:type="resource" xlink:label="lab_mtaff_NumberOfWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/documentation" xml:lang="en-US">Information about number of warrants issued.</label>
<label xlink:type="resource" xlink:label="lab_mtaff_NumberOfWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Number of warrants issued</label>
<label xlink:type="resource" xlink:label="lab_mtaff_NumberOfWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Issued</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_NumberOfWarrantsIssued" xlink:to="lab_mtaff_NumberOfWarrantsIssued"/>




<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExercisePriceOfWarrantsIssued" xlink:label="loc_mtaff_ExercisePriceOfWarrantsIssued"/>
<label xlink:type="resource" xlink:label="lab_mtaff_ExercisePriceOfWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Exercise Price Of Warrants Issued</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ExercisePriceOfWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/documentation" xml:lang="en-US">Represents exercise price of warrants issued.</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ExercisePriceOfWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Exercise price of warrants issued</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_ExercisePriceOfWarrantsIssued" xlink:to="lab_mtaff_ExercisePriceOfWarrantsIssued"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ValueOfWarrantsIssued" xlink:label="loc_mtaff_ValueOfWarrantsIssued"/>
<label xlink:type="resource" xlink:label="lab_mtaff_ValueOfWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Value Of Warrants Issued</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ValueOfWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/documentation" xml:lang="en-US">Represents value of warrant issued.</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ValueOfWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Value of warrants issued</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_ValueOfWarrantsIssued" xlink:to="lab_mtaff_ValueOfWarrantsIssued"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ConvertibleLoanFacility" xlink:label="loc_mtaff_ConvertibleLoanFacility_1"/>
<label xlink:type="resource" xlink:label="lab_mtaff_ConvertibleLoanFacility" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Convertible Loan Facility</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ConvertibleLoanFacility" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Convertible loan facility</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_ConvertibleLoanFacility_1" xlink:to="lab_mtaff_ConvertibleLoanFacility"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mtaff_ConvertibleLoanFacility" xml:lang="en-US">Represents the amount of convertible loan facility.</label>

<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_UndrawnBorrowingFacilities" xlink:label="loc_ifrs-full_UndrawnBorrowingFacilities"/>
<label xlink:type="resource" xlink:label="lab_ifrs-full_UndrawnBorrowingFacilities" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Undrawn borrowing facilities</label>
<label xlink:type="resource" xlink:label="lab_ifrs-full_UndrawnBorrowingFacilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Remaining subsequent advances of convertible loan facility</label>
<label xlink:type="resource" xlink:label="lab_ifrs-full_UndrawnBorrowingFacilities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Undrawn convertible loan facilities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_UndrawnBorrowingFacilities" xlink:to="lab_ifrs-full_UndrawnBorrowingFacilities"/>




<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_InterestRateOnStandbyFundsAvailable" xlink:label="loc_mtaff_InterestRateOnStandbyFundsAvailable"/>
<label xlink:type="resource" xlink:label="lab_mtaff_InterestRateOnStandbyFundsAvailable" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Interest Rate On Standby Funds Available</label>
<label xlink:type="resource" xlink:label="lab_mtaff_InterestRateOnStandbyFundsAvailable" xlink:role="http://www.xbrl.org/2003/role/documentation" xml:lang="en-US">Represents interest rate on standby funds available.</label>
<label xlink:type="resource" xlink:label="lab_mtaff_InterestRateOnStandbyFundsAvailable" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Interest rate on standby funds available</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_InterestRateOnStandbyFundsAvailable" xlink:to="lab_mtaff_InterestRateOnStandbyFundsAvailable"/>




<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_NumberOfUnderwritersWarrantsIssued" xlink:label="loc_mtaff_NumberOfUnderwritersWarrantsIssued"/>
<label xlink:type="resource" xlink:label="lab_mtaff_NumberOfUnderwritersWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Number Of Underwriters Warrants Issued</label>
<label xlink:type="resource" xlink:label="lab_mtaff_NumberOfUnderwritersWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/documentation" xml:lang="en-US">Represents the number of underwriter's warrants issued.</label>
<label xlink:type="resource" xlink:label="lab_mtaff_NumberOfUnderwritersWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Number of underwriter's warrants issued</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_NumberOfUnderwritersWarrantsIssued" xlink:to="lab_mtaff_NumberOfUnderwritersWarrantsIssued"/>




<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ValueOfUnderwritersWarrantsIssued" xlink:label="loc_mtaff_ValueOfUnderwritersWarrantsIssued"/>
<label xlink:type="resource" xlink:label="lab_mtaff_ValueOfUnderwritersWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Value Of Underwriters Warrants Issued</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ValueOfUnderwritersWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/documentation" xml:lang="en-US">The value of underwriter's warrants issued.</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ValueOfUnderwritersWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Value of underwriter's warrants issued</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_ValueOfUnderwritersWarrantsIssued" xlink:to="lab_mtaff_ValueOfUnderwritersWarrantsIssued"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_LiabilitiesIncurred" xlink:label="loc_ifrs-full_LiabilitiesIncurred"/>
<label xlink:type="resource" xlink:label="lab_ifrs-full_LiabilitiesIncurred" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Liabilities incurred</label>
<label xlink:type="resource" xlink:label="lab_ifrs-full_LiabilitiesIncurred" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Convertible debenture payable</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LiabilitiesIncurred" xlink:to="lab_ifrs-full_LiabilitiesIncurred"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate" xlink:label="loc_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate"/>
<label xlink:type="resource" xlink:label="lab_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Identifiable intangible assets recognised as of acquisition date</label>
<label xlink:type="resource" xlink:label="lab_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Royalty Interests</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate" xlink:to="lab_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate"/>
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2018-03-16/full_ifrs/full_ifrs-cor_2018-03-16.xsd#ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:label="loc_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate"/>
<label xlink:type="resource" xlink:label="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Cash and cash equivalents recognised as of acquisition date</label>
<label xlink:type="resource" xlink:label="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Cash</label>
<label xlink:type="resource" xlink:label="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xml:lang="en-US">Cash, beginning of year</label>
<label xlink:type="resource" xlink:label="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xml:lang="en-US">Cash, end of year</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:to="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate"/>
<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_AmountPaidOnSigningOfAgreement" xlink:label="loc_mtaff_AmountPaidOnSigningOfAgreement_1"/>
<label xlink:type="resource" xlink:label="lab_mtaff_AmountPaidOnSigningOfAgreement" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Amount Paid On Signing Of Agreement</label>
<label xlink:type="resource" xlink:label="lab_mtaff_AmountPaidOnSigningOfAgreement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Amount Paid on signing of agreement</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_AmountPaidOnSigningOfAgreement_1" xlink:to="lab_mtaff_AmountPaidOnSigningOfAgreement"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mtaff_AmountPaidOnSigningOfAgreement" xml:lang="en-US">Represents amount paid on at the time of signing of agreement.</label>




<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ConditionalAmountPayableUponAchievementOfCertainMilestones" xlink:label="loc_mtaff_ConditionalAmountPayableUponAchievementOfCertainMilestones_1"/>
<label xlink:type="resource" xlink:label="lab_mtaff_ConditionalAmountPayableUponAchievementOfCertainMilestones" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Conditional Amount Payable Upon Achievement Of Certain Milestones</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ConditionalAmountPayableUponAchievementOfCertainMilestones" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Conditional amount payable upon achievement of certain milestones</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_ConditionalAmountPayableUponAchievementOfCertainMilestones_1" xlink:to="lab_mtaff_ConditionalAmountPayableUponAchievementOfCertainMilestones"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mtaff_ConditionalAmountPayableUponAchievementOfCertainMilestones" xml:lang="en-US">Represents conditional amount payable upon achievement of certain milestones.</label>




<loc xlink:type="locator" xlink:href="mtaff-20190531.xsd#mtaff_ExercisePriceOfWarrantsIssuedWithinUnits" xlink:label="loc_mtaff_ExercisePriceOfWarrantsIssuedWithinUnits_1"/>
<label xlink:type="resource" xlink:label="lab_mtaff_ExercisePriceOfWarrantsIssuedWithinUnits" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Exercise Price Of Warrants Issued Within Units</label>
<label xlink:type="resource" xlink:label="lab_mtaff_ExercisePriceOfWarrantsIssuedWithinUnits" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xml:lang="en-US">Exercise price of warrants issued within units</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtaff_ExercisePriceOfWarrantsIssuedWithinUnits_1" xlink:to="lab_mtaff_ExercisePriceOfWarrantsIssuedWithinUnits"/><label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_mtaff_ExercisePriceOfWarrantsIssuedWithinUnits" xml:lang="en-US">Represents the exercise price of warrants which are issued as part of a unit.</label>

</labelLink></linkbase>
