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

X

- 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

X

- References

No definition available.

+ Details

Name:	mtal_DisclosureOfFairValueMeasurementAbstract
Namespace Prefix:	mtal_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration