LAR · Lithium Argentina AG

Summary

Lithium Argentina AG filed Exhibit 99.1, the 2026 Cauchari-Olaroz S-K 1300 Technical Report for the Cauchari-Olaroz Salars in Jujuy Province, Argentina, effective February 27, 2026. The report details property description, mineral resources and reserves, mining methods, processing for a 40,000 tpa lithium carbonate plant, infrastructure, costs, and environmental studies, updating prior 2025 estimates.

Key takeaways

• Effective date of report: February 27, 2026
• Prepared by qualified persons: David Burga P.Geo., Mark King PhD P.Geo. FGC, Anthony Sanford Pr.Sci.Nat., Marek Dworzanowski EUR ING CEng., Jonathan Gibson P.Eng., Alexander Cushing PhD MFin P.Eng.
• Updates 2026 Mineral Resource and Mineral Reserve estimates from Burga et al. 2025
• Covers brine processing and lithium carbonate plant production for 40,000 tpa plant
• Includes SQM Joint Venture and Ganfeng Joint Venture property arrangements
• Provides capital cost estimate for Exar 40,000 tpa plant and operating cost estimates