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Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Jan. 01, 2022
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Investments |  |
Marketable securities held in trust account | $ 268,909 | $ 265,156

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

X
- Definition The amount of marketable securities held in trust account as of date. + References No definition available. + Details
Name: | mtal_IfrsMarketableSecuritiesHeldInTrustAccount
Namespace Prefix: | mtal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant