DRC-2010-006584 - 0901a068801ec696

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December 23, 2010
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Denison Mines (USA) Corp.
1050 17th Street, Suite 950
Denver, CO 80265
USA
Tel: [phone]
Fax:[phone]
www.denisonmines.com
Cheryl Heying
Division Director
Utah Department of Environmental Quality
Air Quality Division
195 North 1950 West
Salt Lake City, Utah
84116
Re: White Mesa Mill, Notice of Anticipated Date of Initial Startup of Cell 4B Pursuant to 40 CFR
61.09
Dear Ms. Heying:
Reference is made to the application for approval of modification of an existing source under 40 CFR
61.07 with respect to the construction and operation of a new tailings impoundment. Cell 48, at Denison
Mines (USA) Corp's White Mesa Uranium Mill (the "Mill), which was submitted to you on April 13,
2010, and to your approval letter dated May 3,2010.
Reference is also made to the notice given to you on November 2, 2010 pursuant to 40 CFR 61.09(a)(1)
that the anticipated date of initial startup of Cell 48 at that time was between December 2, 2010 and
January 1, 2011, conditional upon receipt of final approvals (the "Final Approvals") from the Executive
Secretary of the Utah Radiation Control 8oard/Co-Executive Secretary of the Utah Water Quality Board.
At this time, the Final Approvals have not been received. Please take notice pursuant to 40 CFR
61.09(a)(l) that the anticipated date of initial startup of Cell 48 will be promptly upon receipt ofthe Final
Approvals, which are currently expected to be received between January 1, 2011 and January 30, 2011.
Please feel free to call me if you have any questions or require any further information
id ci Frydenlund
'^ice President, Regulatory Affairs and Counsel
cc: EPA, Region VIII, Attention: Director, Air and Toxics Technical Enforcement Program
Rusty Lundberg, Executive Secretary Utah Radiation Control Board/Co-Executive Secretary
Utah Water Quality Board
Ron F. Hochstein
Harold R. Roberts