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Standard Lithium Advances Project Pipeline as It Commences Preliminary Feasibility Study at Its South West Arkansas Lithium Project

Corporate Updates

Standard Lithium Advances Project Pipeline as It Commences Preliminary

Feasibility Study at Its South West Arkansas Lithium Project

EL DORADO, Ark., May 02, 2022 -- Standard Lithium Ltd. (“Standard Lithium” or the “Company”) (TSXV: SLI) (NYSE

American: SLI) (FRA: S5L), an innovative technology and lithium project development company, today announced the

commencement of a Preliminary Feasibility Study (PFS) at its South West Arkansas Lithium Project (the “Project”), which is

located approximately 35 miles west of the Company’s Lanxess project.

Standard Lithium recently completed a Preliminary Economic Assessment at the Project ( see Company news release Nov 26,

2021), and on the basis of positive project economics and favorable project fundamentals, the Company has commissioned a

team of technical experts to complete a NI43-101 compliant PFS for the Project. The PFS will consider an integrated project

including; brine supply and injection wells, pipelines and brine treatment infrastructure, a Direct Lithium Extraction (“DLE”)

plant using the Company’s proprietary LiSTR technology, and a lithium chloride to lithium hydroxide conversion plant.

Dr. Andy Robinson, President and COO of Standard Lithium commented “ following the key investment from Koch Strategic

Platforms in Q4 2021, we’ve been able to grow our team with additional technical and management strength. Now we can

manage and drive multiple projects in parallel. The commencement of this comprehensive PFS is a testament to the

Company’s ambition to not only bring the first new commercial lithium project into production in the United States in six

decades, but also to have a robust pipeline of subsequent projects that will serve the future demand for lithium chemicals in

North America. We have assembled a broad team of consultants, technical advisors and subject matter experts to complete

all the necessary work for this PFS, and we will also be working hand in hand with our strategic and project partners to ensure

successful execution. We expect to complete the bulk of the work through the balance of 2022, with completion and reporting

of the results of the PFS in Q1 2023.”

Standard Lithium has engaged Hunt, Guillot & Associates from Ruston, Louisiana (“HGA”) as the lead consultant, to prepare

and coordinate the PFS with support of a multi-disciplinary technical team. The work program to support the PFS will consist

of the following:

• Reentry of existing wells across Standard Lithium’s brine lease area to obtain new representative brine samples from

the Smackover Formation;

• Reperforation of existing wells, where feasible, to obtain discrete depth-specific brine samples from previously

unsampled zones of the Smackover;

• Drilling of a new well in a key location to complete data coverage across the Company’s brine lease area;

• Long duration pumping tests from selected wells to test hydrogeological and reservoir conditions for brine extraction

and reinjection;

• Collection of large volume brine samples during pumping tests to allow the South West Project brine to be processed

through Standard Lithium’s proprietary LiSTR DLE process;

• Acquisition and reprocessing of additional 2D seismic data across and adjacent to the Company’s brine leases;

• Generation of a new 3D reservoir model to determine an updated in-situ lithium resource, and extraction/reinjection

production plans for the commercial facility;

• Completion of several Pilot Studies with technology partners to test the lithium chloride to lithium hydroxide conversion

process at sufficient scale and duration. These studies will be completed using LiCl produced by the Company’s

operating LiSTR Demonstration Plant;

• Updated capital costs (AACE Class 4 estimate +45/-25%) for a similar 30,000 tonnes per annum lithium hydroxide

facility as previously contemplated by the PEA;

• Operating costs updated and benefited by the data gathered during 2+ years of continuous operation of the LiSTR

Demonstration Plant in Union County, Arkansas; and,

• Fully updated project economics using revised future pricing for lithium hydroxide produced and delivered in North

America.

Quality Assurance

Steve Ross, P.Geol., a Qualified Person as defined by NI 43-101, has reviewed and approved the relevant scientific and

technical information that forms the basis for this news release. Mr. Ross is a consultant to the Company.

About Standard Lithium Ltd.

Standard Lithium is an innovative technology and lithium development company. The Company’s flagship project is located in

southern Arkansas, where it is engaged in the testing and proving of the commercial viability of lithium extraction from over

150,000 acres of permitted brine operations. The Company operates its first-of-a-kind industrial-scale Direct Lithium Extraction

(DLE) demonstration plant at Lanxess’s south plant facility in southern Arkansas. The demonstration plant utilizes the

Company’s proprietary LiSTR technology to selectively extract lithium from Lanxess’s tail brine. The demonstration plant is

being used for proof-of-concept and commercial feasibility studies. The scalable, environmentally friendly process eliminates

the use of evaporation ponds, reduces processing time from months to hours and greatly increases the effective recovery of

lithium. The Company is also pursuing the resource development of over 30,000 acres of separate brine leases located in

southwest Arkansas, referred to as the South West Arkansas Lithium Project, and approximately 45,000 acres of mineral

leases located in the Mojave Desert in San Bernardino County, California.

Standard Lithium is jointly listed on the TSX Venture Exchange and the NYSE American under the trading symbol “SLI”; and

on the Frankfurt Stock Exchange under the symbol “S5L”. Please visit the Company’s website

at https://www.standardlithium.com .

On behalf of the Board of Standard Lithium Ltd.

Robert Mintak, CEO & Director

Neither 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 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 affections such statements and information other

than as required by applicable laws, rules and regulations. 

For further information contact:

LHA Investor Relations

David Barnard

+1 415-433-3777

[email protected]

[email protected]

Twitter: @standardlithium

LinkedIn: https://www.linkedin.com/company/standard-lithium/