Phoenix Feasibility Study 2023

Large land position in the infrastructure-rich eastern portion of the Athabasca Basin (1)(2) Northwest Territories ATHABASCA ATHABASCA BASIN Midwest (Denison 25.17%) Alberta Saskatchewan Manitoba Prince Alber Saskatoon Regina 100% Denison Denison operated JV Orano operated JV Cameco operated JV Denison earn-in Uranium mines and deposits Uranium mill Roads Powerlines Waterfound (Denison 24.68%) (3) Arrow Triple R Hook-Carter A 50 km Waterbury Lake (Denison 67.41%) Hatc ake -Waterfound North Bell Lake Mur Wolly Waterfound- Waterbury Lenison J Zone Roughrider Turkey Lake McClean Lake Mill (Denison 22.5%) McClean Lake Mill Eagle Point McClean Lake (1) Denison direct land position shown as of September 30, 2023. Johnston Lake Cigar Lake Midwest ab Rabbit Lake Mill NOTES: Packrat Candle Darby Cigar Lake Mine Park Creek Epp Lake -West Bear Marten Wolverine McArthur River Mine IVE Mann Lake Lynx Moon Lake South 父 (Denison 75%) Centennial Moon Lake North Moon Lake South' Moon Lake nnium Bachman Lake Wheeler River (Phoenix & Gryphon deposits) Russell Lake Wheeler River (Denison 95%)(3) Ford Lake Crawford Lake Provincial Power Grid All Season Highway/Haul Road Brown Lake Key Lake Mill (2) Excludes interests held only through 50% ownership of JCU - See Denison news release dated August 3, 2021. (3) Reflects Denison's effective interest, including a portion attributable to Denison's 50% ownership in JCU (Canada) Exploration Company, Limited. See Denison's news release dated August. 3, 2021. 8

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