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: |