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Fair value measurement - Contingent consideration, Contingent copper consideration, continuity schedule (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($)
Continuity schedule
Balance, end of period	$ 215,330
Contingent copper consideration
Continuity schedule
Initial recognition	97,200
Balance, end of period	$ 97,200

X

- Definition

The amount of contingent liabilities recognised in a business combination. [Refer: Contingent liabilities [member]; Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2023-01-01
-Paragraph B67
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2023-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B
-URIDate 2023-03-23

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount recognised for new contingent liabilities recognised in a business combination. [Refer: Contingent liabilities recognised in business combination]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 3
-IssueDate 2023-01-01
-Paragraph B67
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2023-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B
-URIDate 2023-03-23

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfContingentLiabilitiesAxis=mtal_ContingentCopperConsiderationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: