DRC-2011-007107 - 0901a06880257a85

DENISO
MINES
VIA PDF AND EXPRESS DELIVERY
JUL 2011 K
Divisionof ^^
lion Control
Denison Mines Corp.
6425 S. Highway 191, PO Box 809
Blanding, UT 84511
USA
Tel : [phone]
Fax : [phone]
www.denisonmines.com
July 25, 2011
Mr. Rusty Lundberg
Co-Executive Secretary
Utah Water Quality Board
Utah Department of Environmental Quality
195 North 1950 West
P.O. Box 144820
Sah Lake City, UT 84114-4820
Re: White Mesa Mill Annual Tailings Sampling - Notice Pursuant to Utah Groundwater Discharge
Permit UGW370004.
Dear Mr. Lundberg:
Denison Mines (USA) Corp. is providing this letter to notify the Utah Division of Radiation Control of the
White Mesa Mill's tailings, slimes drain, and leak detection system sampling as required by the Utah
Groundwater Discharge Pennit (the "GWDP") UGW370004. The sampling event is scheduled for Wednesday
August 24, 2011 and, if necessary, Thursday August 25, 2011.
The Mill staff plan to sample the following locations, consistent with the GWDP and the Tailings Slimes Drain
Sampling Program (the "Sampling Program").
Sampling Area Locations
Tailings System Cells Cell #1, Cell#3, Cell#4A, and Cell# 4B.
Slimes Drains Cell 2 Slimes Drain
Leak Detection Systems ("LDSs") Any cell LDS with sufficient liquid present
As indicated in the Sampling Program, slimes drain samples are only collected from cells which have been
removed from service and are undergoing dewatering procedures. For this sampling event, slimes drain
samples will only be collected from Cell #2. Also as indicated in the Sampling Program, LDS samples are only
collected at locations with sufficient free liquid to permit sampling.
If you have any questions or require further assistance, please contact Mr. Dan Hillsten, Mill Manager; Mr. David
Turk, Radiation Safety Officer; or Ryan Palmer at [phone].
Yours very truly,
Jo Ann Tischler
Director, Compliance and Permitting
DENISON MINES (USA) CORP.
cc: Dan Hillsten
David Frydenlund
Ron Hochstein
Ryan Pahner
Harold Roberts
David Turk
Kathy Weinel
DENISO
MINES