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COMMITMENTS - Disclosure of detailed information about contractual obligations (Details) $ in Thousands	Dec. 31, 2024 USD ($)
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

X

- 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

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	mta_CommitmentsLineItems
Namespace Prefix:	mta_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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