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Related party disclosures - Related party promissory note (Details)	Mar. 31, 2023 USD ($)
Sponsor
Related party disclosures
Available Copper Deposit	$ 340,000

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

- Definition

Maximum amount of funding available to the company under the borrowings.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtal_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: