XML 75 R60.htm IDEA: XBRL DOCUMENT
v3.23.4

Basis of accounting - (Details) - USD ($) $ / shares in Units, $ in Thousands | Oct. 13, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Basis of accounting |  |  |
Current liabilities exceed current assets |  | $ 137,101 | $ 17,936
Number of shares issued | 1,827,096 |  |
Share price | $ 11.00 |  |
Proceeds from issuance of shares | $ 20,098 |  |

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 cash inflow from the issuing of ordinary shares. [Refer: Ordinary shares [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 17 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_17&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_ProceedsFromIssueOfOrdinaryShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | mtal_BasisOfAccountingAbstract
Namespace Prefix: | mtal_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | mtal_IfrsSharePrice
Namespace Prefix: | mtal_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of current liabilities exceeding current assets during the period. + References No definition available. + Details
Name: | mtal_WorkingCapitalDeficit
Namespace Prefix: | mtal_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant