Denison Announces Further Extension of High-Grade "Huskie" Zone at Waterbury Lake With Final Summer Drill Holes

Denison Mines Corp.

TORONTO, ONTARIO--(Marketwired - Sept. 19, 2017) - Denison Mines Corp. ("Denison" or the "Company") (TSX:DML)(NYSE MKT:DNN)(NYSE American:DNN) is pleased to report the completion of the summer exploration drilling program at Waterbury Lake, with the final five drill holes returning multiple additional high-grade intersections. The high-grade and basement-hosted uranium mineralized zone has now been expanded to the extent of the current drilling - measuring approximately 100 metres in strike length. The results from the final drill holes of the summer program were highlighted by 1.0% eU3O8 over 7.6 metres (including 4.6% eU3O8 over 1.4 metres) in drill hole WAT17-449, and 0.8% eU3O8 over 7.9 metres (including 3.3% eU3O8 over 1.0 metre and 1.3% eU3O8 over 1.0 metre) in drill hole WAT17-450A.