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Document and Entity Information
 12 Months Ended
Dec. 31, 2024
shares
Entity Addresses [Line Items]  
Entity Central Index Key 0001440972
Amendment Flag true
Document Fiscal Period Focus FY
Document Type 20-F/A
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2024
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2024
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-38350
Entity Registrant Name LITHIUM ARGENTINA AG
Entity Incorporation, State or Country Code V8
Entity Address, Address Line One Dammstrasse 19
Entity Address, City or Town Zug
Entity Address, Postal Zip Code 6300
Entity Address, Country CH
Title of 12(b) Security Registered common shares, $0.01 par value per share
Trading Symbol LAR
Security Exchange Name NYSE
Entity Common Stock, Shares Outstanding 161,931,734
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Accelerated Filer
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Amendment Description EXPLANATORY NOTE Lithium Argentina AG (the "Company") is filing this Amendment No. 1 ("Amendment No. 1") to the Annual Report on Form 20-F for the year ended December 31, 2024 (the "2024 Form 20-F"), as filed with the United States Securities and Exchange Commission (the "SEC") on March 31, 2025 (the "Original Filing Date"), to: file the SEC Technical Report Summary Lithium Resource Estimate Pastos Grandes Project Salta Province, Argentina and update relevant mining disclosure in "Item 4: Information on the Company - D. Property, Plants and Equipment"; update senior management compensation and relevant disclosure in "Item 6: Directors, Senior Management and Employees - Summary Compensation Table"; and supplement "Item 18: Financial Statements" and "Item 19: Exhibits" of the 2024 Form 20-F with the inclusion of the audited financial statements of Minera Exar S.A. (the "Minera Exar Financial Statements"), including the report of Price Waterhouse & Co. S.R.L., an independent registered public accounting firm, relating thereto as required under Rule 3-09 of Regulation S-X. Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, this Amendment No. 1 also includes, as Exhibits 12.1, 12.2, 13.1 and 13.2, the certifications of the Principal Executive Officer and Principal Financial Officer of the Company pursuant to Sections 302 and 906 of the Sarbanes-Oxley Act of 2002. This Amendment No. 1 also includes Exhibit 15.13, which contains the consent of Price Waterhouse & Co. S.R.L., an independent registered public accounting firm, with respect to their report included in the Minera Exar Financial Statements. Except as described above, no changes have been made to the 2024 Form 20-F, and this Amendment No. 1 does not modify, amend or update the financial or other information contained in the 2024 Form 20-F. This Amendment No. 1 does not reflect any events that have occurred on or after the Original Filing Date. Among other things, the Company has not revised forward-looking statements made in the 2024 Form 20-F to reflect events that occurred or facts that became known to the Company after the Original Filing Date. Therefore, this Amendment No. 1 should be read in conjunction with the 2024 Form 20-F and any other documents that the Company has filed with the SEC on or after the Original Filing Date.
Business Contact [Member]  
Entity Addresses [Line Items]  
Contact Personnel Name Alex Shulga
Entity Address, Address Line One 900 West Hastings Street
Entity Address, Address Line Two Suite 310
Entity Address, City or Town Vancouver
Entity Address, State or Province BC
Entity Address, Postal Zip Code V6C 1E5
Entity Address, Country CA
City Area Code 778
Local Phone Number 653-8092
Contact Personnel Email Address alex.shulga@lithium-argentina.com