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Lease liabilities - Amounts recognised in statement of cashflows (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2023 USD ($)
Cash outflow from operating activities |
Payment for interest on lease liabilities | $ 41
Cash outflow from financing activities |
Payment for lease liabilities | 29
Total cash outflow for leases | $ 70

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- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_g&doctype=Standard -URIDate 2023-03-23 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The cash outflow for payment of lease liabilities, classified as financing activities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 17 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_17_e&doctype=Standard -URIDate 2023-03-23 + Details
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Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- References No definition available. + Details
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- Definition The cash outflow from payments of interest on lease liabilities. + References No definition available. + Details
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Namespace Prefix: | mtal_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration