Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Mar. 24, 2023	Jun. 30, 2022
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Document Transition Report	false
Entity File Number	001-40685
Entity Registrant Name	METALS ACQUISITION CORP
Entity Incorporation, State or Country Code	E9
Entity Tax Identification Number	98-1589041
Entity Address, Address Line One	Century House, Ground Floor
Entity Address, Address Line Two	Cricket Square, P.O. Box 2238
Entity Address, City or Town	Grand Cayman
Entity Address State Or Province	KY
Entity Address, Postal Zip Code	KY1-1107
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				$ 259.6
Entity Central Index Key	0001853021
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false
Auditor Name	Ernst & Young LLP	Marcum LLP
Auditor Firm ID	1263	688
Auditor Location	Vancouver, Canada	Houston, TX
Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-third of one redeemable warrant
Document and Entity Information
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 Ordinary Shares
Document and Entity Information
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 Class A ordinary share at an exercise price of $11.50
Document and Entity Information
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 Ordinary Shares
Document and Entity Information
Entity Common Stock, Shares Outstanding			6,628,695