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Sienna Resources Enters into Joint Venture Agreement to Test the Deep Basin Lithium Brine Discovery Potential in Clayton Valley, Nevada Ready to Announce with Confidence?

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Vancouver, British Columbia--(Newsfile Corp. - January 28, 2026) - Sienna Resources Inc. (TSXV: SIEN) (OTCID: SNNAF) (WKN: A418KR) (the "Company" or "Sienna") is pleased to announce that it has entered into a joint venture agreement ("JV") with Cruz Battery Metals Corp. ("Cruz") and Adelayde Exploration Inc. ("Adelayde") to explore the deep basin lithium brine potential in Clayton Valley, Nevada. The 115 mineral claims comprising the 2,300-acre JV land package are all located within, and completely surrounded by, SLB's (formerly Schlumberger) and Pure Energy Minerals' lithium deposit (see map below). Clayton Valley, Nevada is home to the only long-established producing lithium brine basin in the U.S., Albemarle's Silver Peak lithium brine mine, which extracts lithium from subsurface brines. It has been the sole U.S. producing lithium brine operation since the 1960's.

Clayton Valley Lithium Map

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

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Jason Gigliotti, President of Sienna, states, "Lithium prices have been exploding in the past six months, up over 150 percent according to TradingEconomics.com. When you couple this with all-time highs in gold and silver ( Kitco.com), there is a clearly improving investor appetite for junior mining stocks, as witnessed by the historic high volumes on the TSX Venture Exchange in the past month especially. Management feels this is a great strategic move to consolidate this land package, as it is the only group of claims located directly inside the only lithium brine basin in production in the USA. By consolidating this significant footprint into one block, this becomes much more appealing for potential larger partners and opens up more drilling locations with access to reach the deepest sections of brine formations in Clayton Valley. This is a win-win for all involved, and we look forward to getting activities started as lithium prices are at multi-year highs. With just over 40 million shares outstanding and fully cashed up, management is very optimistic about Sienna's leverage to any meaningful discovery on any of its major projects."

Key terms of the Joint Venture Agreement:

This binding letter agreement (this "Agreement") sets out the principal terms of a contractual joint venture (the "Joint Venture") among Adelayde Exploration Inc. ("Adelayde"), Sienna Resources Inc. ("Sienna") and Cruz Battery Metals Corp. ("Cruz" and collectively with Adelayde and Sienna, the "Parties"), whereby each Party has agreed to share in the costs, expenses, liabilities and benefits of the joint exploration and development of the mineral claims that are prospective for lithium.

Please click here to view the completed Joint Venture Agreement.

Qualified Person:

The technical contents of this release were reviewed and approved by Frank Bain, PGeo, independent to the Company and qualified person as defined by National Instrument 43-101

About Sienna

Sienna's primary focus is on its lithium assets in Nevada which include the 100% owned, 1,828-acre "Elko Lithium Project" & the 1,231-acre "Cave Creek Lithium Project" both located in Elko County, Nevada, directly bordering and surrounded by Surge Battery Metals' (NILI) "Nevada North Lithium Project" which is the highest-grade lithium clay deposit in the USA. In Clayton Valley, Nevada, Sienna has the "Deep Basin Lithium Brine Project" which has access to some of the deepest parts of the only lithium brine basin with production in the USA. In Saskatchewan, Sienna has the 31,718-acre Stonesthrow project, prospective for gold, silver and copper directly beside Ramp Metals Inc.'s (RAMP) Rottenstone Project.

Contact Information

Tel: 1604-646-6900

www.siennaresourcesinc.com

"Jason Gigliotti"

President

Sienna Resources Inc.

Forward-Looking Statements

This news release contains forward-looking statements, including statements regarding the Company's plans to recommence operations, anticipated activity levels, market conditions, and future exploration and development activities. Forward-looking statements are subject to known and unknown risks, uncertainties, and other factors that may cause actual results or events to differ materially from those expressed or implied by such statements. These risks include, but are not limited to, fluctuations in commodity prices, exploration and development risks, regulatory approvals, market conditions, and the availability of financing. Readers are cautioned not to place undue reliance on forward-looking statements. The Company undertakes no obligation to update forward-looking statements except as required by applicable securities laws.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/281861

Source: Sienna Resources Inc.

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