XML 144 R129.htm IDEA: XBRL DOCUMENT v3.23.4

Related party disclosures - Share subscriptions and private placements (Details) - USD ($) $ / shares in Units, $ in Thousands	Apr. 14, 2023	Dec. 31, 2022	Jun. 30, 2023
Related party disclosures
Aggregate shares to be issued	11,362,506
Ordinary shares, Par value (in dollars per share)	$ 0.0001
Share issue price (in dollars per share)	$ 10.00
Aggregate price of shares to be issued	$ 113,625
Class B Ordinary Shares
Related party disclosures
Ordinary shares, Par value (in dollars per share)			$ 0.0001
Share issue price (in dollars per share)		$ 0.004
Michael James McMullen
Related party disclosures
Aggregate price of shares to be issued	1,500
Katherine Crouse
Related party disclosures
Aggregate price of shares to be issued	250
Merrin
Related party disclosures
Aggregate price of shares to be issued	$ 50
GMM | Class B Ordinary Shares
Related party disclosures
Number of founder shares transferred	517,500

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

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

Aggregate number of common shares reserved for future issuance.

+ References

No definition available.

+ Details

Name:	mtal_IfrsCommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix:	mtal_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

+ Details

Name:	mtal_IfrsSharesIssuedPricePerShare
Namespace Prefix:	mtal_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of founder shares transferred.

+ References

No definition available.

+ Details

Name:	mtal_NumberOfFounderSharesTransferred
Namespace Prefix:	mtal_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Aggregate price of shares to be issued.

+ References

No definition available.

+ Details

Name:	mtal_SharesOfferingAggregatePrice
Namespace Prefix:	mtal_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	ifrs-full_ClassesOfOrdinarySharesAxis=mtal_ClassBOrdinarySharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=mtal_SpouseOfFormerChiefFinancialOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=srt_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=mtal_GmmMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: