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First time adoption of IFRS - Balance Sheet (Parentheticals) (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
First time adoption of IFRS |  |
Shares subject to possible redemption (in shares) | 26,514,780 | 26,514,780
Redemption price per share (in dollars per share) | $ 10.14 | $ 10.00

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

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- Definition Redemption price per shares. + References No definition available. + Details
Name: | mtal_RedemptionPricePerShares
Namespace Prefix: | mtal_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Subject to possible redemption shares. + References No definition available. + Details
Name: | mtal_SubjectToPossibleRedemptionShares
Namespace Prefix: | mtal_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration