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v3.23.4

Lease liabilities - Sale and leaseback (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2023 USD ($)
Lease liabilities. |
Total proceeds from sale and leaseback arrangement | $ 16,564
ROU asset recognized as part of a sale and leaseback arrangement | 15,733
Financial liability recognised as total proceeds from the sale of the equipment exceeded the fair value of the equipment at the time of sale | $ 609

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

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- Definition The amount of financial liability recognised as total proceeds from the sale of the equipment exceeded the fair value of the equipment at the time of sale. + References No definition available. + Details
Name: | mtal_FinancialLiabilityRecognisedAsTotalProceedsFromSaleOfEquipmentExceededFairValueOfEquipmentAtTimeOfSale
Namespace Prefix: | mtal_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of right of use asset recognized as part of a sale and leaseback arrangement. + References No definition available. + Details
Name: | mtal_RightOfUseAssetRecognizedAsPartOfSaleAndLeasebackArrangement
Namespace Prefix: | mtal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The total proceeds from sale and leaseback arrangement. + References No definition available. + Details
Name: | mtal_TotalProceedsFromSaleAndLeasebackArrangement
Namespace Prefix: | mtal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration