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

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- References

No definition available.

+ Details

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

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- Definition

The amount of marketable securities held in trust account as of date.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtal_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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