Denison Announces 22.5% Owned McClean Lake Operations Granted 10-Year Licence Renewal by CNSC

Denison Mines Corp.

TORONTO, ONTARIO--(Marketwired - July 5, 2017) - Denison Mines Corp. ("Denison" or the "Company") (TSX:DML)(NYSE MKT:DNN) is pleased to announce that its 22.5% owned McClean Lake operations have been granted a 10-year Uranium Mine Operating Licence from the Canadian Nuclear Safety Commission ("CNSC"), which is valid as of July 1, 2017 and will expire on June 30, 2027.