2009-02-06_PERMIT FILE - M1981021

• Permit No: M1981021
• IBM Index Class Name: PERMIT FILE
• Doc Date: 2/6/2009
• Doc Name: Request for Clarification
• From: Denison Mines
• To: DRMS
• Email Name: RCO
• Media Type: D
• Archive: No

Denison Mines (USA) Corp.
E 1050 17th Street, Suite 950
Denver, CO 80265
USA

o Tel : [phone]
Fax : [phone]
1 (?QO www.denisonmines.com
February 6, 2009

?ll Bob Oswald
Department of Natural Resources 2^a
691 County Road 233, Unit A2
Durango, Colorado 81301

Re: Rennest for Clarification on Environmental Protection Plan and Desi gnated Mining Operation
Amendment Deadline
Dear Mr. Oswald:
Denison Mines (USA) Corp. ("Denison") received a determination letter of Designated Mining Operation status
for six Colorado Mines on February 8, 2008. The six mines identified as DMO are as follows:
• Topaz Mine (Permit MJ1980/055 HR)
• St. Jude Mine (Permit M/ 1978/03 9HR)
• Carnation Mine (Permit M/1977/416)
• Sunday Mine (Permit M/1977/285)
• West Sunday Mine (Permit M/1981/021) ???
• Van 4 Mine (Permit M/1997/032)
On March 31, 2008, Denison sent a letter to the Division of Reclamation, Mining and Safety (the "Division")
requesting an extension of the regulatory 180 day time frame to 365 days, during which Denison will collect
data to complete the DMO process. In the same letter, Denison described a phased approach to the DMO
characterization plans and Environmental Protection Plan (EPP) preparation. Denison received an acceptance
letter from the Division on May 9, 2008 approving the 365 day time extension and the phased approach for
characterization and EPP preparation. On June 10th, Denison received a letter from the Division stating that
there would be new requirements and that all uranium mines in Colorado would be DMOs.
To date, Denison has completed and submitted the following:
May 28, 2008 - Drainage Report for the Sunday Mines Group sent to the Division
August 5th - Waste Rock and Ore Characterization Plan submitted to the Division
August 18th -22 d - Collection of waste rock and ore samples from the Sunday Complex and Van 4 mines.
September 18th - Groundwater Characterization Data Collection Work Plan sent to the Division
September 25th - Received DRMS comments on Groundwater Characterization Plan and approval of Sunday
Drainage Report and Waste Rock and Ore Characterization Plan
December 10th - Met with the Division in Durango to discuss preliminary results, progress, and schedule
December 15 th - 19th - Installation of groundwater monitoring wells in underground mine workings