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Trade and other payables (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022	Jan. 01, 2022
Trade and other payables.
Trade payables due to third parties	$ 13,805	$ 927	$ 604
Trade payables due to related parties	15,484
Advances received	12,251
Accrued expenses	18,889
Interest payable	1,673
Mining royalty	1,652
Trade and other payables	$ 63,754	$ 927	$ 604
Average payment period of trade payables	23 days

X

- Definition

The amount of accruals classified as current. [Refer: Accruals]

+ References

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X

- Definition

The amount of current advances received representing current contract liabilities for performance obligations satisfied at a point in time. [Refer: Advances received, representing contract liabilities for performance obligations satisfied at point in time]

+ References

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X

- Definition

The amount of current interest payable. [Refer: Interest payable]

+ References

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Balance Type:	credit
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X

- Definition

The amount of current trade payables and current other payables. [Refer: Current trade payables; Other current payables]

+ References

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Namespace Prefix:	ifrs-full_
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Balance Type:	credit
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X

- Definition

The amount of current payables due to related parties. [Refer: Related parties [member]; Payables to related parties]

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The current amount of payment due to suppliers for goods and services used in entity's business. [Refer: Current liabilities; Trade payables]

+ References

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- References

No definition available.

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Balance Type:	na
Period Type:	duration

X

- Definition

Represents the average payment period of trade payables.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of current mining royalty as of balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtal_
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Balance Type:	credit
Period Type:	instant