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SIEN.V ·

Sienna Resources Inc. Commences Drilling on the Esmeralda County Gold Project, Walker

Exploration Programs

Sienna Resources Inc. Commences Drilling on

the Esmeralda County Gold Project, Walker

Lane, Nevada

Highlights:

Drilling is underway on the Esmeralda County Gold Project, situated within the Walker Lane trend,

one of the most prolific gold-producing corridors in North America

Sienna's maiden drill program on the project, and the Company's first drill program of 2026

Strong share structure with just over 40 million shares outstanding and strong cash position

support multiple expected work programs and marketing initiatives through the second half of 2026

Vancouver, British Columbia--(Newsfile Corp. - September 15, 2026) - Sienna Resources Inc. (TSXV:

SIEN) (OTCID: SNNAF) (WKN: A418KR) (the "Company" or "Sienna") is pleased to announce that

drilling has commenced on the Company's Esmeralda County Gold Project, located within the prolific

Walker Lane trend in Nevada. Titan Drilling Ltd. has mobilized to site and is conducting the Company's

maiden drill program on the project.

Jason Gigliotti, President of Sienna Resources Inc., stated, "We're excited to have drills turning on the

Esmeralda County Gold Project. The Walker Lane trend has a proven track record of hosting significant

gold deposits, and this is our first opportunity to test the project with the drill bit. With our tight share

structure and intact cash position, we believe any drilling success has the potential for an outsized

impact on the Company. We also expect to be active on multiple work programs in the coming weeks

giving Sienna multiple opportunities for success.

Truly exciting times for Sienna shareholders."

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/854/314307_5e95726d047bb9c5_002full.jpg

About Sienna

Sienna has multiple lithium assets in Nevada, which include the 100%-owned, 1,828-acre Elko Lithium

Project and the 1,231-acre Cave Creek Lithium Project, both located in Elko County, Nevada, directly

bordering and nearly surrounded by Surge Battery Metals' (NILI) Nevada North Lithium Project - the

highest-grade lithium clay deposit in the USA. In Clayton Valley, Nevada, Sienna holds the 2,300-acre

Deep Basin Lithium Brine JV, which has access to some of the deepest parts of the only lithium brine

basin with active production in the USA. Also in Nevada, Sienna holds the 1,156-acre Esmeralda County

Gold Project, situated within the Walker Lane trend. In Saskatchewan, Sienna holds the 31,718-acre

Stonesthrow Project, prospective for gold, silver, and copper, located directly adjacent to Ramp Metals

Inc.'s (RAMP) Rottenstone Project.

Qualified Person:

The technical contents of this release were reviewed and approved by Frank Bain, PGeo, independent

to the Company and a qualified person as defined by National Instrument 43-101.

Contact Information

Tel: 604-646-6900

www.siennaresourcesinc.com

"Jason Gigliotti"

President

Sienna Resources Inc.

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

release.

Forward-Looking Statements

This news release contains forward-looking statements and forward-looking information within the

meaning of applicable Canadian securities legislation, including statements regarding the

commencement and anticipated results of the drill program at the Esmeralda County Gold Project, and

the Company's plans and expectations for its work programs in 2026. Forward-looking statements are

based on the reasonable assumptions, estimates, analysis and opinions of management made in light

of its experience and its perception of trends, current conditions and expected developments, as well as

other factors that management believes to be relevant and reasonable in the circumstances at the date

such statements are made, but which may prove to be incorrect. Actual results could differ materially

from those anticipated due to a number of factors and risks, including risks inherent in mineral

exploration. Readers are cautioned not to place undue reliance on forward-looking statements, and the

Company disclaims any obligation to update or revise any forward-looking statements, except as

required by applicable law.

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

https://www.newsfilecorp.com/release/314307