04:52 PM EDT, 03/11/2026 (MT Newswires) -- Lithium Argentina ( LAR ) was up 3.2% in after-hours New York trading after the company on Wednesday released an updated mineral resource and reserve estimate for its Cauchari-Olaroz lithium brine operation in Jujuy Province, Argentina.

The company said the update shows "total measured and indicated resources increased lithium carbonate equivalent estimates by 42% compared to the 2019 estimate, including a significant increase in measured resources reflecting additional drilling, incorporation of operating data, increased resource area and basin-wide hydrogeological modeling."

Cauchari-Olaroz currently has Stage 1 production capacity of 40,000 tonnes per year of lithium carbonate equivalent. The company's Stage 2 expansion plan aims to add another 45,000 tonnes per year, according to the statement.

"With Cauchari-Olaroz Stage 1 continuing to perform exceptionally well - operating near capacity with costs under $6,000 per tonne - we are increasing our focus on our next phase of growth. The Updated Estimate at Cauchari-Olaroz, combined with Pozuelos-Pastos Grandes, provides one of the largest scale and highest-quality lithium brine portfolios globally," chief executive Sam Pigott said in a release.

Lithium Argentina ( LAR ) added that it plans to file a technical report with the updated estimate in March.

The company's shares were last seen up US$0.23 to US$7.45 after hours. They closed up $0.16 to $9.78 on the Toronto Stock Exchange.