Investor Presentaiton

GEMINI: MANY TRENDS DISCOVERED IN THE ATHABASCA BASIN HAVE NUMEROUS DISCOVERIES 0 3km A-Zone DENISON PROJECTS Murphy Lake Hatchet Lake Waterbury North Wolly Eagle Point Waterbury Lake Zonough McClean Mill Midwi ㄨ McClean Lake D-Zone B-Zone Ivison Boy Athabasca Group Athabasca Group Aphebion Metasediments Wollaston Collins Bay Fault Rabbit Lake Pit Loke -8470000 mN 646500 as & D -Per Manflad J Zone Future WAT18-479 WAT18-478 0.43% U,O, over 1.0 m (including 0.73% U,O, over 0.5 m) from 262.5 to 263.5 m 0.20% U,O, over 0.5 m from 372 to 372.5 m 0.45% U,O, over 0.5 m from 410.5 to 411 m 0.31% U,O, over 0.5 m from 420 to 420.5 m Target Area GB Trend GB Trend Oban Trend Oban South Huskie Waterbury Lake Project (Denison, KWULP) 5.7 M lbs U,O, Inferred (268,000 tonnes 0.96% U,O) interpreted Regional Midwest Structure 12.8 M lbs U,O, Indicated (291,000 tonnes 2.00% U,O,) Midwest A 10.8 M lbs U,O, Indicated (566,000 tonnes 0.87% 0,0) & 6.7 M lbs U,O, Inferred (53,000 tonnes 5.81% U,O Midwest Structure Completed 2018 DCIP Resistivity survey Midwest Project (Denison, Areva, OURD Roughrider Waterbury East claim GB Northeast N Phanerozoic Patterson Lake Corridor Athabasca Basin Spitfire Harpoon Cannon Bow✩ ROOE R840W R780E Patterson Lake R1620E Triple R PLC Exploration, Environment, Analysis. Published February 2022 R1515W Arrow Arrow South Aphebian Metasediments Horseshoe Raven Modified from CIM Bulletin, Vol. 82, No. 932, 1989 9 92Energy.com 6460000 N Midwest Extension vest Main 39.9 M lbs U,O, Indicated (453,000 tonnes @4.00% U,O) & 11.5 M lbs UO, Inferred (793,000 tonnes @ 0.66% U,O) Painta North Landing Uranium deposits. Property Boundary 2019 Drill Target Area Interpreted Basement Geology Granite Metasedimentary corridors Structural corridors 2 km Further details regarding the mineral resource estimates for the Waterbury Lake and Midwest properties can be found in the following NI 43-101 Technical Reports: Technical Report with an Updated Mineral Resource Estimate for the Waterbury Lake Property, Northern Saskatchewan, Caneda with an effective date of December 21, 2018 Technical Report with an Updated Mineral Resource Estimate for the Midwest Property, Northem Saskatchewan, Canada with an effective date of March 28, 2018 Reports are available on Denison's website at www.denisonmines.com and under Denison's profile on SEDAR atwww.sedar.com and on EDGAR at www.sec.gov/adgar.shtml Modified from Denison Press Release, 9 January 2019 Radioactive boulder field 0 1.25 2.5 5 kilometres It's all about the trend! Taltson Domain 92 Energy

View entire presentation