Standard Lithium Ltd. reported another significant milestone in its ongoing Smackover expansion efforts. As part of its extensive work in East Texas, the Company has drilled and sampled a new highest confirmed lithium grade brine, measuring 806 mg/L. In addition, comprehensive brine analyses from all three of the Company's new wells in East Texas show highly elevated concentrations of potash (KCl) and bromine, signifying a large potential for these commodities. The drilling work and continued resource evaluation are from areas where the Company has secured the rights to all minerals contained in the brine.

The Smackover Formation represents North America's premier lithium brine asset, with grades comparable to certain resources in South America. As detailed in the Company's Definitive Feasibility Study, the Phase 1A project in El Dorado, Arkansas, contemplates average production of 5,400 tonnes per annum ("tpa") of battery-quality lithium carbonate over a 25-year operating life, with an average lithium grade of 217 mg/L. The Preliminary Feasibility Study for the Company's South West Arkansas Project outlines plans for at least 30,000 tpa of battery-quality lithium hydroxide over a 20-year operating Life, with an average reported lithium grade of 437 mg/L. Average lithium grades in the Company's projects indicate an increasing trend moving westward from Phase 1A (217 mg/L) to the South West Arkansas Project (437 mg/L) and finally, into East Texas (644 mg/L). In Standard Lithium's experience, higher lithium grades in brine are directly correlated with lower capital and operating expenses per tonne of lithium produced, thereby enhancing the economic viability of potential projects.

The data provided in this news release are from three recently drilled and sampled wells in the East Texas Smackover (ETX New Wells #1, #2 & #3).