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Standard Lithium Completes Successful Gravity Geophysical Survey at Cadiz DRY Lake, California Lithium Project

Exploration Programs

STANDARD LITHIUM LTD.

Suite 835, 1100 Melville Street

Vancouver, British Columbia

V6E 4A6

NEWS RELEASE

STANDARD LITHIUM COMPLETES SUCCESSFUL GRAVITY GEOPHYSICAL SURVEY

AT CADIZ DRY LAKE, CALIFORNIA LITHIUM PROJECT

April 19, 2018 – Vancouver, BC – Standard Lithium Ltd.(“Standard Lithium” or the “Company”)

(TSXV: SLL) (FRA: S5L) is pleased to announce that Hasbrouck Geophysics Inc. has successfully

completed a large-scale gravity geophysical survey at the Company’s Cadiz Dry Lake Project, in the

Mojave area of California. The Cadiz Dry Lake Property is located approximately 20 km southeast of

the Company’s Bristol Dry Lake Property and is currently permitted for brine extraction and

processing activities. The work has defined an infilled basin with a maximum depth of just over 700 m

beneath the Project area.

Dr. Andy Robinson, COO and President of Standard Lithium commented: " The results from this high

quality geophysical survey are very encouraging. This work has defined a closed basin with infill

deposits that are known to host lithium brines, based on preliminary sampling of extraction wells

operated by the permitted producer. Standard Lithium’s excellent relationship with the Project’s

permitted operator will allow for further exploration of the deeper basin infill deposits under the

existing permitted brine operations. This successful and rapid acquisition of high quality gravity

survey data from our Cadiz Dry Lake Project will be used to plan additional resource assessment work

at Cadiz for the remainder of 2018."

Hasbrouck Geophysics, Prescott, AZ collected gravity readings from 89 new stations, integrated 85

public domain gravity stations, and integrated data over approximately 211 km 2. The new stations

were spaced at 1 km intervals along 17 east-west lines spaced 700-800 m apart. The integrated gravity

model defined a basin-shaped depression that underlies the approximately 11,840 acres of placer and

patented mineral claims. The basin underlying the claims is steep-sided, consistent with the basin

being fault-bounded, and similar in nature to Standard Lithium’s nearby Bristol Dry Lake Project.

Repeat readings of new stations ranged between 0.014 and 0.027 mGals, while the spread for base

readings (both field and absolute) is between 0.009 and 0.015 mGals, demonstrating that the data are

of excellent quality.

The well-defined gravity trough and deeper basin indicate potential for structurally concentrated

lithium brines at depth. The survey results will be used to plan further exploration, which will include

additional geophysical surveys to identify Li-brine bearing zones and structural control. For further

information on the adjacent Bristol Dry Lake Project, please see Standard Lithium’s Technical Report

dated September 13, 2016, compiled in accordance with NI 43-101 guidelines on Sedar.com.

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 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 is

currently engaged in the exploration and resource development of the Bristol Dry Lake Lithium Project

located in the Mojave region of San Bernardino County, California; the location has significant

infrastructure in-place, with easy road and rail access, abundant electricity and water sources, and is

already permitted for extensive brine extraction and processing activities. The Company is also

rapidly conducting resource evaluation on up to 33,000 acres of brine leases located in the Smackover

Formation in Southern Arkansas.

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.