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Cypress Development Files Prefeasibility Study for Clayton Valley Lithium Project in Nevada

Economic Studies

Suite 1610 - 777 Dunsmuir Street, Vancouver, BC, Canada, V7Y 1K4

www.cypressdevelopmentcorp.com

TSX Venture Exchange Symbol: CYP

Email: [email protected]

Telephone: (604) 687-3376

Facsimile: (604) 687-3119

NEWS RELEASE

June 3, 2020

Cypress Development Files Prefeasibility Study for Clayton Valley

Lithium Project in Nevada

Vancouver, BC - Cypress Development Corp. (TSX-V: CYP) (OTCQB: CYDVF)

(Frankfurt: C1Z1) (“Cypress” or “the C ompany”) is pleased to announce , further to

its News Release on May 19, 2020, the full Prefeasibility Study (PFS) of the Clayton

Valley Lithium Project in Nevada, U.S.A. was filed on SEDAR and is available on the

Company’s web site . The PFS was prepared by Continental Metallurgical Servic es

(CMS) and Global Resource Engineering (GRE) and has an Effective Date of May

19, 2020. Todd Fayram (CMS), Terre Lane (GRE), and Daniel Kalmbach are the

authors.

Highlights from the PFS and news release are as follows:

• Average production rate of 15,000 tonnes per day to produce 27,400 tonnes

lithium carbonate equivalent (LCE) annually over a +40-year mine life.

• Capital cost estimate of US$493 million, pre-production, and operating cost

estimate averaging US$3,329* per tonne LCE. (* see Note)

• After-tax net present value at an 8% disc ount rate (NPV-8%) of US$1.052

billion and an after-tax internal rate of return (IRR) of 25.8% based on a price

of $9,500/tonne for lithium carbonate.

• Production based on Probabl e Mineral Reserve of 2 22 million tonnes

averaging 1,141 ppm Li (1.353 Mt LCE).

• Mineral Reserves and production p lan derived from Measured and Indicated

Mineral Resources of 593 million tonnes averaging 1,073 ppm Li (3.387 Mt

LCE).

Next Steps:

Throughout 2019 and 2020, the C ompany focused on completing the PFS . During

this time, the Company engaged with interested parties in discussing ways to move

the project forward. With the next step a pilot plant program, as recommended in the

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PFS, Cypress intends to invite propo sals that can add value to the project and the

Company through financial, technical, operating or marketing capabilities.

“We are extremely pleased with the effort of Cypress’ staff and consultants to bring

the project to this level of interest and look forward to securing a partner to achieve

the next step in develop ment”, noted Cypress CEO Bill Willoughby. “We thank the

authors of th e PFS, Mr . Fayram, Ms. Lane and Mr. Kalmbach, and are grateful for

the assistance of Dr. Brereton and Mr. Mielke from NORAM Engineering and

Constructors Ltd. (NORAM), and input from our technical a dvisor, Dr. Corby

Anderson."

In prep aration for the pilot pla nt program, the following work is underway , core

logging and analyses on se veral drill holes , supplemental metallurgical tests, and

environmental studies. In the past week, another lar ge sample w as leached and

filtered at Continental Metallurgical Services (CMS) in Butte, Montana and the filtrate

shipped to NORAM in Vancouver , BC for further work to test the NORAM-CMS

flowsheet under varying conditions. Testing thus far has yielded concentrated lithium

solution suitable for producing high purity lithium hydroxide. The recommendations in

the PFS are to study the process with a pilot plant and simulate all key functions of a

full-scale operation. Planning for the collection of material for the pilot plant program

is underway.

The time frame and cost for the pilot plant program are estimated in the PFS at six

months and US$ 6.75 million . Cypress CEO Bill Willoughby notes “Our team

consistently met the challenges presented to us throughout the PFS. Every step was

a learning process and we are confident that appreciation for this work and our asset

base in Clayton Valley will carry the project forward through the next phase”.

Note: The May 19, 2020 New Release contained two typographic errors where the production

cost was listed as $3,392/tonne. The correct value is $3,329/tonne.

Qualified Persons:

Todd Fayram, MMSA-QP, of Continental Metallurgical Services, LLC., Terre Lane,

MMSA-QP, of Glo bal Resource Engineer ing, and Daniel Kalmbac h, CPG, are the

qualified persons as defined b y National Instrume nt 43-101 and ha ve approved the

technical information in this release.

About Cypress Development Corp.:

Cypress Development Corp. is a publicly tra ded exploration com pany foc used on

developing t he Company's 100%-owned Clayton V alley Li thium Project, loca ted

immediately east of Albemarle's Silver Peak mine, North America's only lithium brine

operation. Exploration and development by Cypress ha s discov ered an extensive

deposit of lithiu m-bearing clay stone adjacent to the brine field. The size of t he

resource makes t he Project a premier target with the potential t o impact the future

supply of lithium for the fast-growing global lithium-ion battery market.

Cypress Development Corp. has approx. 90.1 million shares issued and outstanding.

To find out more about Cypress Development Corp. (TSX-V: CYP), visit our website

at www.cypressdevelopmentcorp.com.

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CYPRESS DEVELOPMENT CORP.

“Dr. Bill Willoughby”

WILLIAM WILLOUGHBY, PhD., PE

Chief Executive Officer

For further information contact myself or:

Don Myers

Cypress Development Corp.

Director, Corporate Communications

Telephone: 604-639-3851

Toll Free: 800-567-8181

Facsimile: 604-687-3119

Email: [email protected]

NEITHER THE TSX VENTURE EXCHANGE NOR ITS REGULATION SERVICES

PROVIDER ACCEPTS RESPONSIBILITY FOR THE ADEQUACY OR ACCURACY OF THE

CONTENT OF THIS NEWS RELEASE.

This release includes certain statements t hat may be de emed to be " forward-looking

statements". All statements in this relea se, othe r than statements of historical fac ts, that

address e vents or d evelopments that management of t he Company expects, a re forwa rd-

looking st atements. Although management believes the expectations expres sed in such

forward-looking statements are based on reasonable assumptions, such statements are not

guarantees of future performance, and actual results or developments may differ materially

from those in the forward -looking statements. The Company undertakes no obligation to

update these forward -looking statements if management's beliefs, estima tes or opinion s, or

other factors, should change. Factors th at could cause actual results to differ materially from

those in forwar d-looking sta tements, inc lude mar ket prices, exploration and development

successes, continued availability of capital and fin ancing, and ge neral economic, market or

business conditions. Please see the publi c filing s of the Comp any at www.sedar.com for

further information.