XML 60 R39.htm IDEA: XBRL DOCUMENT v3.25.1

SUPPLEMENTAL DISCLOSURE WITH RESPECT TO CASH FLOWS (Narrative) (Details) $ in Millions	1 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($) shares	Feb. 28, 2023 shares	Dec. 31, 2024 USD ($) Share shares	Dec. 31, 2023 USD ($) Share shares
Supplemental Disclosure Of Cash Flow [Line Items]
Reallocation from reserves for RSU settled			$ 1.8	$ 2.2
RSUs settled | Share			305,690	270,704
Reallocation from reserves for stock options exercised			$ 0.8	$ 0.9
Number of stock options exercised | Share			820,781	779,527
A&R Loan Facility [Member]
Supplemental Disclosure Of Cash Flow [Line Items]
Conversion on loan payable (shares) | shares			429,800
Conversion on loan payable			$ 1.1
Third Drawdown [Member] | Amended Loan Facility [Member]
Supplemental Disclosure Of Cash Flow [Line Items]
Conversion on loan payable (shares) | shares				545,702
Conversion on loan payable				$ 3.3
Nova portfolio acquisition [Member]
Supplemental Disclosure Of Cash Flow [Line Items]
Number of common shares issued for acquisitions of royalty interests | shares				34,943,542
Common shares issued for acquisitions of royalty interests				$ 112.1
Lama Royalties Acquisition [Member]
Supplemental Disclosure Of Cash Flow [Line Items]
Number of common shares issued for acquisitions of royalty interests | shares	466,827			466,827
Common shares issued for acquisitions of royalty interests	$ 2.5			$ 2.1
Alamos Royalty Portfolio Acquisition [Member]
Supplemental Disclosure Of Cash Flow [Line Items]
Number of common shares issued for acquisitions of royalty interests | shares		939,355		939,355
Common shares issued for acquisitions of royalty interests				$ 4.2

X

- Definition

The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2024-01-01
-Paragraph 45
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of share options exercised in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2024-01-01
-Paragraph 45
-Subparagraph b
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_b_iv&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Value of common shares issued for acquisitions of royalty interests.

+ References

No definition available.

+ Details

Name:	mta_CommonSharesIssuedForAcquisitionsOfRoyaltyInterests
Namespace Prefix:	mta_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Number of shares issued for conversion on loan payable.

+ References

No definition available.

+ Details

Name:	mta_IncreaseDecreaseSharesThroughConversionOnLoanPayable
Namespace Prefix:	mta_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

It represents increase decrease value through conversion on loan payable.

+ References

No definition available.

+ Details

Name:	mta_IncreaseDecreaseValueThroughConversionOnLoanPayable
Namespace Prefix:	mta_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the number of common shares issued for acquisitions of royalty interests.

+ References

No definition available.

+ Details

Name:	mta_NumberOfCommonSharesIssuedForAcquisitionsOfRoyaltyInterests
Namespace Prefix:	mta_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of reallocation from reserves for restricted share units settled.

+ References

No definition available.

+ Details

Name:	mta_ReallocationFromReservesForRestrictedShareUnitsSettled
Namespace Prefix:	mta_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of reallocation from reserves for stock options exercised.

+ References

No definition available.

+ Details

Name:	mta_ReallocationFromReservesForStockOptionsExercised
Namespace Prefix:	mta_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents supplemental disclosure of cash flow line item.

+ References

No definition available.

+ Details

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

X

- Details

Name:	mta_TypeOfArrangementsAxis=mta_AAndRLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	mta_ConvertibleLoanFacilityDrawdownAxis=mta_ThirdDrawdownMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	mta_TypeOfArrangementsAxis=mta_AmendedLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_BusinessCombinationsAxis=mta_NovaRoyaltyCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_BusinessCombinationsAxis=mta_LamaRoyaltiesAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_BusinessCombinationsAxis=mta_AlamosAcquisitionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: