Denison Reports 25 Metres of 1.3% eU3O8 as Gryphon Exploration Continues at Wheeler River

Denison Mines (“Denison” or the “Company”) (TSX:DML)(NYSE MKT:DNN) is pleased to report that multiple high-grade intervals of uranium mineralization have been returned from the initial drill holes completed during the summer 2017 drilling program on the Company’s 60% owned Wheeler River project. The summer 2017 drilling program is focused on the delineation and expansion of the Gryphon deposit and, to date, has been successful on multiple fronts including expansion of mineralization within the A, B and D series of lenses.
A total of 9,446 metres in 17 holes have been completed as part of the summer 2017 drilling program, which is expected to include approximately 18,000 metres in 40 holes. Results below are reported as preliminary radiometric equivalent grades (“eU₃O₈“) derived from a calibrated downhole total gamma probe. The Company subsequently reports definitive assay grades following sampling and chemical analysis of the mineralized drill core.
Highlights

• 1.3% eU₃O₈ over 25.3 metres (including 3.3% eU₃O₈ over 7.8 metres) in drill hole WR-604D1
• 4.1% eU₃O₈ over 5.9 metres in drill hole WR-692
• 2.3% eU₃O₈ over 9.3 metres in drill hole WR-564D1
• 3.0% eU₃O₈ over 7.0 metres (including 3.6% eU₃O₈ over 5.7 metres) in drill hole WR-610D1
• 1.9% eU₃O₈ over 8.4 metres (including 2.5% eU₃O₈ over 6.2 metres) in drill hole WR-570D1

The results show good consistency with the current inferred block model, with drill holes WR-564D1 and WR-570D1 indicating potential for resource growth in their respective areas of the deposit. In total, 31 infill and delineation drill holes have been completed of the approximately 40 holes required.
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