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COMMITMENTS - Disclosure of detailed information about contractual obligations (Details) $ in Thousands | Dec. 31, 2024 USD ($)
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Commitments [Line Items] |
Total contractual commitments | $ 21,456
Less than 1 year [Member] |
Commitments [Line Items] |
Total contractual commitments | 2,345
1 to 3 years [Member] |
Commitments [Line Items] |
Total contractual commitments | 19,111
Over 3 years [Member] |
Commitments [Line Items] |
Total contractual commitments | 0
Trade and other payables [Member] |
Commitments [Line Items] |
Total contractual commitments | 1,188
Trade and other payables [Member] | Less than 1 year [Member] |
Commitments [Line Items] |
Total contractual commitments | 1,188
Trade and other payables [Member] | 1 to 3 years [Member] |
Commitments [Line Items] |
Total contractual commitments | 0
Trade and other payables [Member] | Over 3 years [Member] |
Commitments [Line Items] |
Total contractual commitments | 0
Loans payable principal and interest payments [Member] |
Commitments [Line Items] |
Total contractual commitments | 17,768
Loans payable principal and interest payments [Member] | Less than 1 year [Member] |
Commitments [Line Items] |
Total contractual commitments | 1,157
Loans payable principal and interest payments [Member] | 1 to 3 years [Member] |
Commitments [Line Items] |
Total contractual commitments | 16,611
Loans payable principal and interest payments [Member] | Over 3 years [Member] |
Commitments [Line Items] |
Total contractual commitments | 0
Payments related to acquisition of royalties and streams [Member] |
Commitments [Line Items] |
Total contractual commitments | 2,500
Payments related to acquisition of royalties and streams [Member] | Less than 1 year [Member] |
Commitments [Line Items] |
Total contractual commitments | 0
Payments related to acquisition of royalties and streams [Member] | 1 to 3 years [Member] |
Commitments [Line Items] |
Total contractual commitments | 2,500
Payments related to acquisition of royalties and streams [Member] | Over 3 years [Member] |
Commitments [Line Items] |
Total contractual commitments | $ 0

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- Definition The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ContractualCapitalCommitments
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | mta_CommitmentsLineItems
Namespace Prefix: | mta_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanThreeYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=mta_TradeAndOtherPayablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_LoanCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=mta_AcquisitionsOfRoyaltiesAndStreamsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |