Denison Reports Extension of Cornerstone Contract for Environmental Services Business

Denison Mines Corp.

TORONTO, ONTARIO--(Marketwired - July 26, 2017) - Denison Mines Corp. ("Denison" or the "Company") (TSX:DML)(NYSE MKT:DNN) is pleased to announce that the Company's environmental services business, operating under the brand Denison Environmental Services ("DES"), has entered into a new two year services agreement with Rio Algom Limited, which is a subsidiary of BHP Billiton Limited ("BHP"). The agreement is in relation to the management and operation of several of BHP's decommissioned mine sites in Ontario and Quebec.