RETRANSMISSION: Sienna More Than Doubles its Acreage Bordering Cameco Corporation in the Athabasca Basin of Saskatchewan

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Vancouver, British Columbia--(Newsfile Corp. - August 21, 2024) - Sienna Resources Inc. (TSXV: SIE) (OTC Pink: SNNAF) (FSE: A1XCQ0) ("Sienna" or the "Company") is pleased to announce that it has more than doubled its acreage on the Dragon Uranium Project directly bordering Cameco Corporation (CCO) in the world-class uranium district of the Athabasca Basin. This project now consists of 23,134 contiguous acres. 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. Management is formulating plans for the Athabasca Basin Uranium projects.

Jason Gigliotti, President of Sienna Resources Inc., stated, "We are very pleased to significantly increase our acreage directly bordering Cameco Corporation (CCO.t) in the Athabasca Basin. The Athabasca Basin is world renowned as the world's highest grade uranium district and home to many of the world's largest and highest grade uranium discoveries. There has been a renewed interest in uranium recently as the USA's first new major uranium project in 30 years has just come on line in Georgia. Sienna also just increased its landholdings bordering Ramp Minerals Inc in Saskatchewan. Sienna is one of the larger landholders in this exciting new gold mining camp and with Eric Sprott taking a major stake in the area it shows the promises of this new potentially world-class mining district. Sienna management is currently developing plans to move forward on this large sized new gold project at a time when gold is at all-time highs. Sienna is coming into a very active period and management is very optimistic about the short and long term growth drivers in place now."

Recently (July 22, 2024), Sienna significantly increased its acreage on the Stonesthrow Gold Project in Saskatchewan now consisting of approximately 18,350 contiguous acres prospective for gold directly bordering Ramp Metals Inc (RAMP). 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 for the drilling of this prospect. 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.

Recently, (May 23, 2024) Sienna acquired Case Lake West Cesium and Spodumene Pegmatite Project in the Larder Lake Mining division of Ontario, Canada, roughly 100 km north of Kirkland Lake, NE Ontario. This project consists of approximately 2,200 contiguous acres prospective for Cesium and Spodumene Pegmatites directly bordering Power Metals Corp's (PWM) Case Lake cesium and pegmatite swarm discovery. On May 22, 2024 Power Metals announced "WORLD-CLASS CESIUM RESULTS UP TO 18.13% 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.