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v3.23.4

Fair value measurement - Contingent consideration, Deferred consideration (Details) $ in Thousands | Jun. 30, 2023 USD ($)
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Fair value measurement |
Deferred cash payment | $ 75,000

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- Definition The fair value, at acquisition date, of deferred consideration as consideration transferred in a business combination. + References No definition available. + Details
Name: | mtal_DeferredConsideration
Namespace Prefix: | mtal_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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