XML 152 R137.htm IDEA: XBRL DOCUMENT
v3.23.4

Subsequent events (Details) $ / shares in Units, $ in Thousands, $ in Thousands |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 17, 2023 USD ($) $ / shares shares | Oct. 09, 2023 USD ($) | Oct. 09, 2023 AUD ($) | Oct. 08, 2023 USD ($) | Oct. 08, 2023 AUD ($) | Jun. 30, 2023 USD ($) | Oct. 13, 2023 shares | Apr. 14, 2023 $ / shares
Subsequent events |  |  |  |  |  |  |  |
Increase in performance guarantees | $ |  |  |  |  |  | $ 36,803 |  |
Number of shares issued | shares |  |  |  |  |  |  | 1,827,096 |
Ordinary shares, Par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.0001
Proceeds from issue of share capital | $ |  |  |  |  |  | $ 313,186 |  |
Rehabilitation obligations |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |
Increase in performance guarantees |  | $ 29,311 | $ 44,031 | $ 24,500 | $ 36,803 |  |  |
Shares issuance under subscription agreement | Ordinary shares |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |
Number of shares issued | shares | 1,827,096 |  |  |  |  |  |  |
Ordinary shares, Par value (in dollars per share) | $ / shares | $ 0.0001 |  |  |  |  |  |  |
Issued price per share | $ / shares | $ 11.00 |  |  |  |  |  |  |
Proceeds from issue of share capital | $ | $ 20,098 |  |  |  |  |  |  |

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_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase in existing contingent liabilities recognised in a business combination. [Refer: Contingent liabilities recognised in business combination; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2023-01-01 -Paragraph B67 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2023-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B -URIDate 2023-03-23 + Details
Name: | ifrs-full_IncreaseDecreaseInExistingLiabilitiesContingentLiabilitiesRecognisedInBusinessCombination
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106_d&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_NumberOfSharesIssued
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_79_a_iii&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_ParValuePerShare
Namespace Prefix: | ifrs-full_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow from issuing shares. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 17 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_17_a&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_ProceedsFromIssuingShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Per share value of shares issued during the period. + References No definition available. + Details
Name: | mtal_IfrsIssuedPricePerShare
Namespace Prefix: | mtal_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ifrs-full_ContingentLiabilityForDecommissioningRestorationAndRehabilitationCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ifrs-full_MajorOrdinaryShareTransactionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |