Denison Mines Corp.
Atrium on Bay, 595 Bay Street, Suite 402
Toronto, ON M5G 2C2
Ph. 416-979-1991 • Fx. 416-979-5893 • www.denisonmines.com
DENISON ANNOUNCES EXPANDED SUMMER EXPLORATION
PROGRAM ON WHEELER RIVER PROPERTY
Toronto, ON — May 13, 2010... Denison Mines Corp. (TSX:DML) (NYSE AMEX:DNN)
(“Denison” or the “Company”) is pleased to report that the Wheeler River joint venture partners (the
“Joint Venture”) have approved the addition of a third drilling rig for the upcoming summer program.
The summer program is anticipated to begin in early June and will involve the drilling of 45 holes for
approximately 20,000 metres. The anticipated spending for the year is now estimated at CDN$7.0
million (Denison’s share, CDN$3.6 million).
Summer Drill Program
The summer 2010 drill program will initially have three primary areas of focus. One rig will
concentrate on drilling the known Phoenix Zone A mineralization to further expand the zone. The
second drill will focus on Area D in the extreme northeast, where drill holes WR-309 and 309A from
the winter program intercepted a silicified cap and strong sandstone and basement alteration. This
rig will also test strike extensions to the southwest of Zone A. The third rig will concentrate solely on
identified untested geophysical anomalies along the favourable horizon over a strike length of seven
kilometres to the northeast and southwest of the known Zone A of the Phoenix deposit.
Winter Drill Program Results
Assay results from the final nine drill holes of the winter drill program have been received. Previously
released initial probe results (April 26, 2010) are confirmed by the assay results. The following table
shows only the significant mineral intersections from the final nine drill holes of the winter program.
2010 Winter Program Results
There were no significant mineral intersections in drill holes WR-303, 304, 307, 309A and 310. The
attached map illustrates the entire 2010 winter program drilling results.