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Sienna More Than Doubles its Acreage Bordering Cameco Corporation in the Athabasca Basin of Saskatchewan

Mergers & Acquisitions

Sienna More Than Doubles its Acreage

Bordering Cameco Corporation in the

Athabasca Basin of Saskatchewan

Vancouver, British Columbia--(Newsfile Corp. - August 20, 2024) - Sienna Resources Inc. (TSXV: SIE)

(OTC Pink: SNNAF) (FSE: A1XCQ0) ("Sienna" or the "Company") is pleased to announce that it has

more than doubled its acreage on the Dragon Uranium Project directly bordering Cameco Corporation

(CCO) in the world-class uranium district of the Athabasca Basin.

This project now consists of 23,134

contiguous acres. Sienna Resources' management cautions that past results or discoveries on

properties in proximity to Sienna Resources may not necessarily be indicative of the presence of

mineralization on the company's properties.

Management is formulating plans for the Athabasca Basin

Uranium projects.

Jason Gigliotti, President of Sienna Resources Inc. stated, "We are very pleased to significantly

increase our acreage directly bordering Cameco Corporation (CCO.t) in the Athabasca Basin.

The

Athabasca Basin is world renowned as the world's highest grade uranium district and home to many of

the world's largest and highest grade uranium discoveries.

There has been a renewed interest in

uranium recently as the USA's first new major uranium project in 30 years has just come on line in

Georgia.

Sienna also just increased its landholdings bordering Ramp Minerals Inc in Saskatchewan.

Sienna is one of the larger landholders in this exciting new gold mining camp and with Eric Sprott taking

a major stake in the area it shows the promises of this new potentially world-class mining district.

Sienna

management is currently developing plans to move forward on this large sized new gold project at a time

when gold is at all-time highs.

Sienna is coming into a very active period and management is very

optimistic about the short and long term growth drivers in place now."

Recently (July 22, 2024), Sienna significantly increased its acreage on the Stonesthrow Gold Project in

Saskatchewan now consisting of approximately 18,350 contiguous acres prospective for gold directly

bordering Ramp Metals Inc (RAMP).

Ramp announced (June 17, 2024) multiple zones of gold

mineralization, including 73.55 grams per tonne gold and 19.50 grams per tonne silver. Ramp has just

announced a strategic investment led by Eric Sprott for the drilling of this prospect.

Sienna Resources'

management cautions that past results or discoveries on properties in proximity to Sienna Resources

may not necessarily be indicative of the presence of mineralization on the company's properties.

Recently, (May 23, 2024) Sienna acquired Case Lake West Cesium and Spodumene Pegmatite Project

in the Larder Lake Mining division of Ontario, Canada, roughly 100 km north of Kirkland Lake, NE

Ontario.

This project consists of approximately 2,200 contiguous acres prospective for Cesium and

Spodumene Pegmatites directly bordering Power Metals Corp's (PWM) Case Lake cesium and

pegmatite swarm discovery. On May 22, 2024 Power Metals announced "WORLD-CLASS CESIUM

RESULTS UP TO 18.13% AT CASE LAKE."

This was very exciting news regarding this growing cesium

district. Sienna management cautions that past results or discoveries on properties in proximity to

Sienna may not necessarily be indicative of the presence of mineralization on the company's properties.

About Sienna Resources Inc.

Sienna has acquired the "Stonesthrow Gold Project", consisting of approximately 18,350 contiguous

acres prospective for gold.

Sienna has also recently acquired the

"Case Lake West Cesium and

Spodumene Pegmatite Project" in Larder Lake Mining division of Ontario, Canada roughly 100 km north

of Kirkland Lake, NE Ontario.

This project consists of approximately 2,200 contiguous acres prospective

for Cesium and Spodumene Pegmatites.

Sienna has also just acquired the 10,357

acre "Uranium Town

Project" bordering Denison Mines Corporation (DML, DNN) ,

the now 23,134 contiguous acre "Dragon

Uranium Project" bordering Cameco Corporation (CCO, CCJ)

and the 55,440 acre "Atomic Uranium

Project" in the world renowned Athabasca Basin of Saskatchewan.

Also, Sienna recently expanded the

"Elko Lithium Project" in Elko County, Nevada.

This project consists of approximately 1840 contiguous

acres directly bordering Surge Battery Metals' (NILI) "Nevada North Lithium Project" in Elko County,

Nevada who announced the highest grade lithium deposit in the USA.

Sienna is also one of the larger

landholders in Clayton Valley Nevada. Sienna's Clayton Valley projects include the Blue Clay Lithium

Project, the Silver Peak South Project, and the Clayton Valley Deep Basin Lithium Project. Clayton

Valley is home to the only lithium production in North America, being Albemarle Corp's (NYSE: ALB)

Silver Peak deposit.

This project is also near Tesla Motors Inc.'s (NASDAQ: TSLA) Gigafactory in

Nevada. On March 18, 2021, Schlumberger New Energy Venture (NYSE: SLB) announced the

development of a lithium extraction pilot plant through its new venture, NeoLith Energy in a strategic

partnership with Pure Energy (TSXV: PE). The deployment of the pilot plant will be in Clayton Valley,

Nevada, USA. The NeoLith Energy sustainable approach uses a differentiated direct lithium extraction

(DLE) process to enable the production of high-purity, battery-grade lithium material while reducing the

production time from over a year to weeks. Results from this pilot plant are expected in 2024 and could

have a significant impact on the brine prospects within Clayton Valley Nevada as Sienna is located in

the deepest section of this brine deposit.

This new acreage was acquired via staking.

Qualified Person:

Mr. Frank Bain, PGeo, a qualified person as defined by National Instrument 43-101 has reviewed and

approved the scientific and technical disclosure contained within this news release.

If you would like to be added to Sienna's email list, please email

[email protected]

for

information or join our twitter account at

@SiennaResources

.

Contact Information

Tel:

1.604.646.6900

Fax: 1.604.689.1733

www.siennaresources.com

[email protected]

"Jason Gigliotti"

President, Director

Sienna Resources Inc.

Statements in this news release that are not historical facts are forward-looking statements.

Forward-

looking statements are statements that are not historical, and consist primarily of projections -

statements regarding future plans, expectations and developments.

Words such as "expects",

"intends", "plans", "may", "could", "potential", "should", "anticipates", "likely", "believes" and words of

similar import tend to identify forward-looking statements.

Forward-looking statements in this news

release include uncertainty of exploration and development plans regarding the property; commodity

price fluctuations; political or economic instability and regulatory changes; currency fluctuations, the

state of the capital markets; uncertainty in the measurement of mineral reserves and resource

estimates; the Company's ability to attract and retain qualified personnel and management; potential

labour unrest; reclamation and closure requirements for mineral properties and the availability of

capital to fund the Company's projects, as well as other risks and uncertainties identified under the

heading "Risk Factors" in the Company's continuous disclosure documents filed on SEDAR.

You are

cautioned that the foregoing list is not exhaustive of all factors and assumptions which may have been

used.

The Company cannot assure you that actual events, performance or results will be consistent

with these forward-looking statements, and management's assumptions may prove to be incorrect.

These forward-looking statements reflect current expectations regarding future events and operating

performance and speak only as of the date hereof and the Company does not assume any obligation

to update forward-looking statements if circumstances or management's beliefs, expectations or

opinions should change other than as required by applicable law. For the reasons set forth above, you

should not place undue reliance on forward-looking statements.

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

policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this

press release.

To view the source version of this press release, please visit

https://www.newsfilecorp.com/release/220503