Clayton Valley Lithium Update

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Vancouver, British Columbia--(Newsfile Corp. - September 12, 2024) - Sienna Resources Inc. (TSXV: SIE) (OTC Pink: SNNAF) (FSE: A1XCQ0) ("Sienna" or the "Company") wishes to update the shareholders on some lithium developments that recently occurred in the Clayton Valley of Nevada. September 10, 2024 SLB (formerly Schlumberger) announced that "…SLB today announced it has proven its solution for sustainable lithium production at scale at its demonstration plant in Clayton Valley, Nevada, to accelerate responsibly-sourced lithium products to market…The proprietary integrated solution combines SLB's subsurface expertise with surface engineering of advanced technologies that include direct lithium extraction (DLE). It produces lithium 500 times faster than conventional methods while using only 10 percent of the land. Operating at approximately one tenth the size of a commercial-scale facility, the plant reached a verified recovery rate of 96% lithium from brine…In proving this solution at its pilot plant, SLB completed specific technical milestones allowing it to fully qualify under the earn-in agreement with Pure Energy Minerals Ltd. and, at its option, may acquire 100% ownership interest in the Clayton Valley Project" Sienna has property right inside of the Pure/SLB's Clayton Valley Project (see map) located in the deepest section of this basin. 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.

Sienna Resources Ownership Map

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Jason Gigliotti, President of Sienna Resources Inc. stated, "We would like to congratulate the SLB and Pure teams for many years of hard work finally coming to fruition. This is a watershed moment for the Clayton Valley itself, as this marks the true entrance of SLB into the lithium space. Sienna has been holding its Clayton Valley Deep Basin Lithium Projects for many years watching the developments on this project primarily, as Sienna shares the deepest part of this basin with SLB. SLB still has a road ahead, but this moment is clearly a turning point for development within this basin. We look forward to now moving this project much higher up in the Sienna project priority list."

Recently, Sienna announced (September 4, 2024) that it has significantly increased its acreage on the Stonesthrow Gold Project in Saskatchewan now consisting of approximately 31,718 contiguous acres prospective for gold directly bordering Ramp Metals Inc. 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. 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.