XML 103 R88.htm IDEA: XBRL DOCUMENT v3.23.4

Loans and borrowings - Mezzanine debt facility - Margin rate and composition of interest payments (Details) - Mezzanine Debt Facility	Mar. 10, 2023
If LME Copper Price less then $3.40/LB
Loans and borrowings
Margin rate (as a percent)	12.00%
Interest payments, capitalised to principal (as a percent)	100.00%
Interest payments, cash (as a percent)	0.00%
If LME Copper Price >$3.40/lb to $3.85/lb
Loans and borrowings
Margin rate (as a percent)	10.00%
Interest payments, capitalised to principal (as a percent)	60.00%
Interest payments, cash (as a percent)	40.00%
If LME Copper Price >$3.85/lb
Loans and borrowings
Margin rate (as a percent)	8.00%
Interest payments, capitalised to principal (as a percent)	0.00%
Interest payments, cash (as a percent)	100.00%

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

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

X

- Definition

The percentage of interest payments to be capitalised to principal.

+ References

No definition available.

+ Details

Name:	mtal_BorrowingsInterestPaymentsCapitalisedToPrincipalPercentage
Namespace Prefix:	mtal_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The percentage of interest payments to be made in cash.

+ References

No definition available.

+ Details

Name:	mtal_BorrowingsInterestPaymentsCashPercentage
Namespace Prefix:	mtal_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The interest rate margin on borrowings.

+ References

No definition available.

+ Details

Name:	mtal_BorrowingsInterestRateMarginPercentage
Namespace Prefix:	mtal_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	ifrs-full_BorrowingsByNameAxis=mtal_MezzanineDebtFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=mtal_IfLondonMetalExchangeCopperPriceIsLessThanDollars3.40PerLbMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=mtal_IfLondonMetalExchangeCopperPriceIsGreaterThanDollars3.40PerLbAndLessThanDollars3.85PerLbMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=mtal_IfLondonMetalExchangeCopperPriceIsGreaterThanDollars3.85PerLbMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: