Mr. Jason Gigliotti reports

SIENNA RESOURCES INC. COMMENCES WORK ON THE 31,718-ACRE STONESTHROW PROJECT, PROSPECTIVE FOR GOLD, SILVER, AND COPPER, IN SASKATCHEWAN

Sienna Resources Inc.'s work program on the 31,718-acre Stonesthrow project, prospective for gold, silver and copper, in Saskatchewan is now under way. Ground crews have been dispatched to specific targeted locations for a more detailed groundwork over the highest priority targets uncovered by the recently completed airborne work.

Highlights:

• Work now under way on the Stonesthrow copper-gold project in Saskatchewan;
• Drilling is under way 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.

Jason Gigliotti, president of Sienna Resources, stated: "We are continuing to be very active on our projects right now. When you couple this ground program to focus on the highest-priority targets with the current gold drill program we have going on our Esmeralda county gold project within the Walker Lane trend in Nevada, it is clear this is a time of high-potential, impactful news drivers. 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 robust cash position, we believe any drilling success has the potential for an outsized impact on the company. Being active on multiple work programs gives Sienna multiple opportunities for success the short term. Truly exciting times for Sienna shareholders."

About Sienna Resources Inc.

Sienna Resources has multiple lithium assets in Nevada, which include the 100-per-cent-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 United States. In Clayton Valley, Nevada, Sienna Resources holds the 2,300-acre Deep basin lithium brine joint venture, which has access to some of the deepest parts of the only lithium brine basin with active production in the United States. Also in Nevada, Sienna Resources 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 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.

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