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v3.23.4

Fair value measurement - Contingent consideration, Contingent copper consideration (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2023 USD ($) item $ / lb
Fair value measurement |
Number of contingent payments | item | 2
Copper contingent consideration payment amount | $ | $ 75,000
Trigger price | 4.25
18-Month | 18 months
Trigger price | 4.50
24-Month | 24 months

X
- Definition The 18-month trigger price on the London Metal Exchange (LME) for the contingent consideration. + References No definition available. + Details
Name: | mtal_ContingentConsiderationLondonMetalExchangeTriggerPriceRollingEighteenMonthPeriod
Namespace Prefix: | mtal_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition The 18-month trigger price on the London Metal Exchange (LME) for the contingent consideration. + References No definition available. + Details
Name: | mtal_ContingentConsiderationLondonMetalExchangeTriggerPriceRollingTwentyFourMonthPeriod
Namespace Prefix: | mtal_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition The first contingent consideration trigger price period. + References No definition available. + Details
Name: | mtal_ContingentConsiderationTriggerPricePeriodOne
Namespace Prefix: | mtal_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The second contingent consideration trigger price period. + References No definition available. + Details
Name: | mtal_ContingentConsiderationTriggerPricePeriodTwo
Namespace Prefix: | mtal_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of copper contingent consideration payments. + References No definition available. + Details
Name: | mtal_CopperContingentConsiderationPaymentAmount
Namespace Prefix: | mtal_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition The number of contingent consideration payments. + References No definition available. + Details
Name: | mtal_NumberOfContingentPayments
Namespace Prefix: | mtal_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant