Document and Entity Information - USD ($)	10 Months Ended
	Dec. 31, 2021	Mar. 31, 2022	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2021
Entity File Number	001-40685
Entity Registrant Name	METALS ACQUISITION CORP
Entity Incorporation, State or Country Code	KY
Entity Tax Identification Number	98-1589041
Entity Address, Address Line One	425 Houston Street, Suite 400
Entity Address, City or Town	Fort Worth
Entity Address State Or Province	TX
Entity Address, Postal Zip Code	76102
City Area Code	817
Local Phone Number	698-9901
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
ICFR Auditor Attestation Flag	false
Entity Ex Transition Period	false
Entity Shell Company	true
Entity Public Float			$ 0
Entity Central Index Key	0001853021
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Auditor Name	Marcum LLP
Auditor Firm ID	688
Auditor Location	Houston, TX
Units, each consisting of one Class A Ordinary share, $0.0001 par value, and one-third of one redeemable warrant
Document Information [Line Items]
Title of 12(b) Security	Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-third of one redeemable warrant
Trading Symbol	MTAL.U
Security Exchange Name	NYSE
Class A Common Stock
Document Information [Line Items]
Title of 12(b) Security	Class A ordinary shares included as part of the units
Trading Symbol	MTAL
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		26,514,780
Redeemable warrants included as part of the units, each whole warrant exercisable for one share of Class A ordinary share at an exercise price of $11.50
Document Information [Line Items]
Title of 12(b) Security	Redeemable warrants included as part of the units, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50
Trading Symbol	MTAL WS
Security Exchange Name	NYSE
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		6,628,695