Standard Lithium Ltd. announced that the Company has commenced detailed resource definition work at its recently optioned 33,000 acres of brine leases, located in a highly prospective area of the Smackover Formation in Southern Arkansas, USA. This work integrates collection of new data from current well infrastructure, with a large amount of already-available, high quality, geological, geophysical and geochemical data. The lease area has been historically drilled for oil and gas exploration, and approximately 256 exploration and production wells have been completed in the Smackover Formation in or immediately adjacent to Standard's new lease area (almost 3,000 wells have been drilled in southern Arkansas and provide excellent data to support interpretation in Standard's lease zone). All of these 256 wells have geological logs, and all can be used to constrain the top of the Smackover Formation's brine-bearing zone. In addition, a sub-set of 30 wells has full core reports that provide detailed data, and downhole geophysical logs that include formation resistivity and porosity data. A further sub-set of 15 wells also has full core samples available from the Smackover Formation, these cores (available from the Arkansas Geological Survey core library) can be sent for additional laboratory testing to further refine porosity estimates for the Smackover resource zone in Standard's lease area.