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Sienna Again Significantly Increases Acreage of Case Lake West Cesium and Spodumene Pegmatite Project in Ontario to 7,850 Contiguous Acres.

Mergers & Acquisitions

Sienna Again Significantly Increases Acreage

of Case Lake West Cesium and Spodumene

Pegmatite Project in Ontario to 7,850

Contiguous Acres.

Vancouver, British Columbia--(Newsfile Corp. - October 3, 2024) - Sienna Resources Inc. (TSXV: SIE)

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

significantly increased its acreage on 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 now consists of approximately 7,850 contiguous acres prospective for Cesium and

Spodumene Pegmatites directly bordering Power Metals Corp.'s Case Lake cesium and pegmatite

swarm discovery. On May 22, 2024, Power Metals announced, "world-class cesium results up to 18.13

per cent 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.

Jason Gigliotti, President of Sienna Resources Inc. stated, "We are pleased to increase our footprint to

now being approximately 7,850 contiguous acres on the Case Lake West Cesium and Spodumene

Pegmatite Project in Ontario.

The area is quickly gaining global attention as it

is one of the world's only

areas prospective for Cesium.

Sienna has once again significantly increased its acreage in this exciting

mining district and management looks forward to getting the work program underway on this project.

Sienna is coming into a very active period and management is very optimistic about the short and long

term growth drivers in place now."

Case Lake West Project

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About Sienna Resources Inc.

Sienna has significantly increased acreage of the "Stonesthrow Gold Project", consisting now of

approximately 31,718 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 7,850 contiguous acres prospective for Cesium and Spodumene Pegmatites.

Sienna has

also just acquired the 10,357

acre "Uranium Town Project" bordering Denison Mines Corporation,

the

now 23,134 contiguous acre "Dragon Uranium Project" bordering Cameco Corporation and the 55,440

acre "Atomic Uranium Project" in the world renowned Athabasca Basin of Saskatchewan.

Also, Sienna

has the "Elko Lithium Project" in Elko County, Nevada consisting of approximately 1830 contiguous

acres directly bordering Surge Battery Metals' "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 Silver Peak

deposit.

This project is also near Tesla Motors Inc.'s Gigafactory in Nevada. On March 18, 2021,

Schlumberger New Energy Venture announced the development of a lithium extraction pilot plant with a

strategic partnership with Pure Energy.

On September 10, 2024, SLB announced that the "Nevada

demonstration plant integrates direct lithium extraction (DLE), concentration and conversion

technologies to sustainably produce lithium at scale with integrated technology solution produces lithium

from brine 500 times faster than conventional methods while using significantly less land, water and

chemical reagents with a verified results confirm recovery rate of 96% lithium from brine at operational

rates."

The success that SLB achieved could have a significant future 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/225411