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Standard Lithium Provides Updates ON Fully Funded Resource Assessments Program Underway

Resource Estimates

STANDARD LITHIUM LTD.

Suite 835, 1100 Melville Street

Vancouver, British Columbia

V6E 4A6

NEWS RELEASE

STANDARD LITHIUM PROVIDES UPDATES ON FULLY FUNDED RESOURCE

ASSESSMENTS PROGRAM UNDERWAY

June 20, 2018 – Vancouver, BC – Standard Lithium Ltd.(“Standard Lithium” or the “Company”)

(TSXV: SLL) (FRA: S5L) is pleased to provide the following updates on the Company’s fully funded

resource assessment programs underway at its two brownfield lithium brine project locations.

In Arkansas, the Company has begun sampling at all current, active, and permitted brine production

wells from the 150,000+ acres of brine leases recently announced by the Company on May 9 th, 2018

(link to news release here ). The Company has also received total brine production data from the

Arkansas Oil and Gas Commission (the “AOGC”) for the last six years of production. The Company

will continue sampling brine from these active production wells at regular intervals over the next one

to two months. Analyses from this sampling program, combined with production volume data from

the AOGC and extensive geophysical data the Company has received, will be used to assist in

completing a forthcoming resource assessment for this large brine lease area.

In the area of Standard Lithium’s 30,000+ acre brine lease package announced January 8, 2018 (link to

news release here), the Company is working with an existing operator allowing the Company to access

existing wells to confirm well completion and integrity and will conduct brine sampling through a

program that will purge static brine from the wells to allow flow of representative Smackover

Formation brines to the surface. The chemistry and flow data collected from the wells, combined with

extensive historical lithium brine information from the lease package, will be incorporated into the

forthcoming resource assessment for the 30,000+ acre Standard Lithium lease area.

In California, the Company has successfully completed six of a seven exploration drill program, and a

new drilling rig is scheduled to be mobilised to the Bristol Dry Lake Project site to complete the final

and deepest exploration borehole at the project. As part of the Company’s on-going brine processing

work, a third series of evaporation pond tests at the Mojave project has been completed, and the

concentrated brine from this testing round will be shipped to the Company’s mini-Pilot plant site for

additional process testing work. A round of brine sampling has also been completed from the brine

production wells at the neighbouring Cadiz Dry Lake Project and data will be incorporated into the

ongoing resource model compilation.

Dr. Andy Robinson, COO and President of Standard Lithium commented "Having access to permitted

and operating wells in areas of our Southern Arkansas project for brine sampling is a unique data

gathering opportunity.”Dr Robinson added “With our exploration program in California near

completion and our technical teams processing the huge amount of geological, geophysical and

hydrogeological data available in Southern Arkansas, we are now close to having a complete

conceptual model for all of our lithium brine project areas, and this current phase of work will round-

out our resource model assessments, which we hope to finalise later this summer."

Quality Assurance

Raymond Spanjers, Registered Professional Geologist (SME No. 3041730), is a qualified person as

defined by NI 43-101, and has supervised the preparation of the scientific and technical information

that forms the basis for this news release. Mr. Spanjers is not independent of the Company as he is an

officer in his role as Vice President, Exploration and Development.

About Standard Lithium

Standard’s value creation strategy encompasses acquiring a diverse and highly prospective portfolio of

large-scale brownfield domestic brine resources, led by an innovative and results-oriented management

team with a strong focus on technical skills and modern brine processing technologies. The

Company’s flagship project is in southern Arkansas, where it is engaged in the testing and proving of

commercial viability of lithium extraction from 150,000+ acres of permitted brine operations and also

the resource development of 30,000+ acres of separate brine leases, both located in the Smackover

Formation. It is also engaged in the exploration and resource development of approximately 45,000

acres at the Bristol and Cadiz Dry Lake Lithium Projects located in the Mojave Desert, San Bernardino

County, California. All of Standard Lithium’s Project areas have significant infrastructure in-place,

with easy road and rail access, abundant electricity and water sources, and already permitted brine

extraction and processing operations.

Standard Lithium is listed on the TSX Venture under the trading symbol “SLL”; quoted on the

OTCQX under the symbol “STLHF”; and on the Frankfurt Stock Exchange under the symbol “S5L”.

Please visit the Company’s website atwww.standardlithium.com.

For further information, contact Anthony Alvaro at (604) 240 4793

On behalf of the Board,

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.

Readers are cautioned that a “Qualified Person” (as that term is defined by National Instrument 43-

101 – Standards of Disclosure for Mineral Projects) has not done sufficient work to specify any

mineral resource or reserve on the Properties.