Smackover Lithium Releases Maiden Inferred Resource for its Franklin Project Comprising a Portion of Significant Brine Position in East Texas

Standard Lithium Wed, September 24, 2025

Highlighted by 2.2M tonnes of Lithium Carbonate Equivalent (“LCE”) at an average lithium grade of 668 mg/L, 15.4M tonnes of potash and 2.6M tonnes of bromide at the Inferred Resource Category

LEWISVILLE, Ark., Sept. 24, 2025 (GLOBE NEWSWIRE) -- Smackover Lithium, a Joint Venture (“JV”) between Standard Lithium Ltd. (“Standard Lithium” or the “Company”) (TSXV: SLI) (NYSE.A: SLI) and Equinor (“Equinor”) (OSE: EQNR) (NYSE: EQNR), announced today a maiden inferred resource for its Franklin Project (the “Project”) in the northeast region of Texas, USA. This report for the JV’s first project in the East Texas region of the Smackover highlights the size and quality of its brine position. It contains the highest reported lithium-in-brine grades in North America and marks a key step towards the ultimate goal of reaching production of over 100,000 tonnes of lithium chemicals per year in Texas through multiple phases. This goal is further supported by two additional projects that the JV is planning to develop in East Texas that roughly triples the size of the portfolio area in the state.

Maiden Inferred Resource Highlights:

• Extensive brine mineral leasing for the Franklin Project.   Brine mineral leasing has been ongoing since 2022 in the approximate 80,000 acre project area (see Figure 1). Over 46,000 acres have been leased to support the inferred resource.
• Exploration activities completed to inform Inferred Resource. 2D seismic, historic oil and gas well core and logging information, including completing three exploration wells in 2023, were used to assess the aquifer characteristics and brine chemistry. The highest reported North American lithium brine concentration to date of 806 mg/L was measured from the Pine Forest 1 well (see Figure 1 and news release dated 25^th October 2023).
• Maiden Inferred Resource assessment supports multiple potential critical mineral products. The maiden resource report includes 2,159,000 metric tonnes of lithium carbonate equivalent, 15,414,000 tonnes of potash (as potassium chloride) - a newly added mineral to the U.S. Geological Survey 2025 Draft Critical Mineral List - and 2,638,000 tonnes of bromide (ionized form of the commercial product bromine), contained within 0.61 km³ of brine volume underlying Smackover Lithium’s gross leased acreage at the Inferred Resource category (see Table 1).

Dr. Andy Robinson, President and COO of Standard Lithium stated, “Our team has been working diligently for the past four years to identify the most attractive areas to secure sizeable, high-quality brine resources in North America, and the Franklin Project provides a strong foundation for future, much larger production in the Smackover that will complement our South West Arkansas Project. Standard Lithium is more than a single project company. We believe East Texas to be a meaningfully underappreciated part of our total asset portfolio and expect this report to be a key initial step towards achieving more appropriate recognition for this world-class asset.”

Allison Kennedy Thurmond, VP for US Lithium at Equinor added, “This resource report is an important step in realizing the broader lithium potential for our Smackover Lithium JV. We are proud of the milestones the team continues to meet, and we are excited to continue progressing the Project toward the next phase.”

Figure 1: Franklin Project Area Map