 TORONTO, Aug. 4, 2021 PRNewswire - Denison Mines Corp. Denison or the Company TSX: DML NYSE American: DNN is pleased to report positive interim results from the ongoing metallurgical test program for the planned In-Situ Recovery ISR mining operation at the Phoenix uranium deposit Phoenix, located on the Companys 90 owned Wheeler River Uranium Project Wheeler River or the Project. Test work completed to date, has consistently supported an ISR mining uranium head-grade for Phoenix in excess of the 10 grams Litre gL assumed in the Pre-Feasibility Study PFS completed for Wheeler River in 2018. 