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Smackover Lithium’s South West Arkansas Project Receives Unanimous Vote of Approval to Establish the Phase I Brine Production Unit from the Arkansas Oil and Gas Commission

Permits & Approvals

Smackover Lithium’s South West Arkansas Project Receives Unanimous Vote

of Approval to Establish the Phase I Brine Production Unit from the Arkansas

Oil and Gas Commission

LEWISVILLE, Ark., April 24, 2025 -- Smackover Lithium, a Joint Venture (“JV”) between Standard Lithium Ltd. (“Standard

Lithium” or the “Company”) (TSXV:SLI) (NYSE:A:SLI) and Equinor, is pleased to announce that the brine production unit, now

formally named the Reynolds Unit, for Phase I of its South West Arkansas (“SWA”) Project has been unanimously approved

by the Arkansas Oil and Gas Commission (“AOGC”) with no objections or opposition in a hearing that was open to all

stakeholders from the community.

“We thank the AOGC for their due diligence in reviewing our application and for their swift approval,” said Standard Lithium’s

President and COO, Dr. Andy Robinson, who provided testimony at the hearing. “The establishment of the Reynolds brine unit

is another key milestone our team has now successfully completed as we march towards a final investment decision for the

SWA Project, and also a necessary statutory requirement as we look to set a royalty for the unit in late May.”

“Gaining regulatory approval for our first brine unit is an important step in our project timeline. We look forward to working with

the AOGC and community stakeholders to establish a competitive royalty rate for this unit and continue momentum with the

SWA Project,” said Allison Kennedy Thurmond, VP of US Lithium at Equinor.

The Reynolds unit is 20,854 acres in size and is planned to produce 22,500 tonnes per year of battery-quality lithium

carbonate once in full commercial production, expected in 2028. For more information about the SWA Project and Smackover

Lithium, please visit www.smackoverlithium.com

About Standard Lithium Ltd.

Standard Lithium is a leading near-commercial lithium development company focused on the sustainable development of a

portfolio of large, high-grade lithium-brine properties in the United States. The Company prioritizes projects characterized by

the highest quality resources, robust infrastructure, skilled labor, and streamlined permitting. Standard Lithium aims to achieve

sustainable, commercial-scale lithium production via the application of a scalable and fully integrated Direct Lithium Extraction

(“DLE”) and purification process. The Company’s flagship projects are located in the Smackover Formation, a world-class

lithium brine asset, focused in Arkansas and Texas. In partnership with global energy leader Equinor, Standard Lithium is

advancing the South West Arkansas project, a greenfield project located in southern Arkansas, and actively exploring

promising lithium brine prospects in East Texas. Standard Lithium also holds an interest in certain mineral leases in the

Mojave Desert in San Bernardino County, California.

Standard Lithium trades on both the TSX Venture Exchange and the NYSE American under the symbol “SLI”. Please visit the

Company’s website at www.standardlithium.com.

About Equinor

Equinor is an international energy company committed to long-term value creation in a low-carbon future. Equinor’s portfolio of

projects encompasses oil and gas, renewables and low-carbon solutions, with an ambition of becoming a net-zero energy

company by 2050. Headquartered in Norway, Equinor is the leading operator on the Norwegian continental shelf and is present

in around 30 countries worldwide. Our partnership with Standard Lithium to mature DLE projects builds on our broad US

energy portfolio of oil and gas, offshore wind, low carbon solutions and battery storage projects.

For more information on Equinor in the US, please visit: Equinor in the US - Equinor

Investor and Media Inquiries

Chris Lang

Standard Lithium Ltd.

+1 604 409 8154

[email protected]

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of the TSX Venture

Exchange) accepts responsibility for the adequacy or accuracy of this release. This news release may contain certain

“Forward-Looking Statements” within the meaning of the United States Private Securities Litigation Reform Act of 1995 and

applicable Canadian securities laws. When used in this news release, the words “anticipate”, “believe”, “estimate”, “expect”,

“target”, “plan”, “forecast”, “may”, “schedule” and other similar words or expressions identify forward-looking statements or

information. These forward-looking statements or information may relate to intended development timelines, future prices of

commodities, accuracy of mineral or resource exploration activity, reserves or resources, regulatory or government

requirements or approvals, the reliability of third party information, continued access to mineral properties or infrastructure,

fluctuations in the market for lithium and its derivatives, changes in exploration costs and government regulation in Canada

and the United States, and other factors or information. Such statements represent the Company’s current views with respect

to future events and are necessarily based upon a number of assumptions and estimates that, while considered reasonable

by the Company, are inherently subject to significant business, economic, competitive, political and social risks,

contingencies and uncertainties. Many factors, both known and unknown, could cause results, performance or achievements

to be materially different from the results, performance or achievements that are or may be expressed or implied by such

forward-looking statements. The Company does not intend, and does not assume any obligation, to update these forward-

looking statements or information to reflect changes in assumptions or changes in circumstances or any other events

affecting such statements and information other than as required by applicable laws, rules and regulations.