| Cover | 12 Months Ended |
| Dec. 31, 2023 shares | |
| Document Information [Line Items] | |
| Document Type | 20-F/A |
| Amendment Flag | false |
| Document Registration Statement | false |
| Document Annual Report | true |
| Document Transition Report | false |
| Document Shell Company Report | false |
| Document Period End Date | Dec. 31, 2023 |
| Document Fiscal Period Focus | FY |
| Document Fiscal Year Focus | 2023 |
| Current Fiscal Year End Date | --12-31 |
| Entity File Number | 001-41722 |
| Entity Registrant Name | METALS ACQUISITION LIMITED |
| Entity Central Index Key | 0001950246 |
| Entity Incorporation, State or Country Code | Y9 |
| Entity Address, Address Line One | 3rd Floor, 44 Esplanade |
| Entity Address, City or Town | St. Helier |
| Entity Address, Country | JE |
| Entity Address, Postal Zip Code | JE4 9WG |
| City Area Code | 44 |
| Local Phone Number | 1534 514 000 |
| Title of 12(b) Security | Ordinary Shares, $0.0001 par value per share |
| Trading Symbol | MTAL |
| Security Exchange Name | NYSE |
| 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 Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Document Accounting Standard | International Financial Reporting Standards |
| Entity Shell Company | false |
| Entity Common Stock, Shares Outstanding | 50,236,544 |
| Contact Personnel Name | Michael James McMullen |
| ICFR Auditor Attestation Flag | false |
| Document Financial Statement Error Correction [Flag] | false |
| Auditor Name | Ernst & Young LLP |
| Auditor Location | Toronto, Canada |
| Auditor Firm ID | 1263 |
| Deloitte Touche Tohmatsu [Member] | |
| Document Information [Line Items] | |
| Auditor Name | Deloitte Touche Tohmatsu |
| Auditor Location | Paramatta, Australia |
| Auditor Firm ID | 1070 |
