XML 135 R120.htm IDEA: XBRL DOCUMENT v3.23.4

Fair value measurement - Contingent consideration, Contingent copper consideration, key inputs (Details)	Jun. 30, 2023 $ / lb
Price volatility
Assumptions used for valuation
Significant unobservable input, liabilities	0.5394
Risk-free rate
Assumptions used for valuation
Significant unobservable input, liabilities	0.0393
Contingent copper consideration | Long-term price
Assumptions used for valuation
Significant unobservable input, liabilities	3.63
Contingent copper consideration | Spot price
Assumptions used for valuation
Significant unobservable input, liabilities	3.77
Contingent copper consideration | Price volatility
Assumptions used for valuation
Significant unobservable input, liabilities	25.70
Contingent copper consideration | Annual inflation rate
Assumptions used for valuation
Significant unobservable input, liabilities	1.07
Contingent copper consideration | Risk-free rate
Assumptions used for valuation
Significant unobservable input, liabilities	3.97
Contingent copper consideration | Reversion factor
Assumptions used for valuation
Significant unobservable input, liabilities	11.55

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The value of significant unobservable input used in the measurement of the fair value of liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2023-01-01
-Paragraph 93
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_d&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_SignificantUnobservableInputLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	ifrs-full_UnobservableInputsAxis=ifrs-full_HistoricalVolatilityForSharesMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_UnobservableInputsAxis=mtal_RiskFreeRateMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfContingentLiabilitiesAxis=mtal_ContingentCopperConsiderationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_UnobservableInputsAxis=mtal_LongTermPriceMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_UnobservableInputsAxis=mtal_SpotPriceMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_UnobservableInputsAxis=mtal_AnnualInflationRateMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_UnobservableInputsAxis=mtal_ReversionFactorMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: