2008-02-06_PERMIT FILE - M1981021

• Permit No: M1981021
• IBM Index Class Name: PERMIT FILE
• Doc Date: 2/6/2008
• Doc Name: Notice of Determination of DMO
• From: DRMS
• To: Denison Mines
• Media Type: D
• Archive: No

~~L DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
February 6, 2008
Mr. Harold Roberts
Executive Vice President (U.S. Operations)
~~ Denison Mines (USA) Corporation
X1050 Seventeenth Street, Suite 950
Denver, CO 80265
STATE OF COLORADO ~~
~~~ ~dw
~~C~O~~
FEB 0 0 2008
Division of Reclamation,
Mining and Safety

RE: Notice of Determination of Designation Mining Operation (DMO);
DRMS File No. M-1981-021, West Sunday Mine.
~ ~
Dear Mr. Roberts,
~ ~~m~
COLORADO
DIVISION O F
RECLAMATION
MINING
SAl ETY
Bill Owens
Governor
Russell George
Executive Director
Ronald W. Cattany
Division Director
Natural Resource Trustee
Based on a review of operational conditions at the West Sunday Mine, the Colorado
Division of Reclamation, Mining & Safety (the Division) has determined, under the
criteria specified in Rule 1.1(14) of the MINERAL RULES AND REGULATIONS OF
THE COLORADO MINED LAND RECLAMATION BOARD FOR HARD ROCK,
METAL AND DESIGNATED MINING OPERATIONS (Regulations), that the West
Sunday Mine meets the definition of a Designated Mining Operation (DMO). Under the
authority of Rule 7.2.2 of the Regulations, the Division hereby notifies Denison Mines
(USA) Corporation (Denison) that the determination has been made, effective on the
date of this notice, that the West Sunday Mine is a Designated Mining Operation.
The Division's determination is based on the following:
The site has the potential to release toxic materials as a result of mining operations.
Under Rule 1.1(14) of the Regulations, a site will be assigned DMO status if "toxic or
acid-forming materials will be exposed or disturbed as a result of mining operations."
The Division is of the opinion that the ore and waste rock that are generated by mining at
the West Sunday Mine are toxic materials.
The obligations and requirements of a site assigned DMO status are described in Rules
6.4, 7, and 8 of the Regulations, a copy of which may be downloaded from the Division's
website at: http://minin~.state.co.us/.
If Denison agrees with this determination, you are required to notify the Division by mail
of your concurrence within 30 days of the date of this notice and proceed to comply with
the requirements of Subsections (2) and (3) of Rule 7.2.3 of the Regulations. If Denison
disagrees with the Division's determination, you may appeal this notice in writing to thi
Office of Office of
Mined Land Reclamation Active and Inactive Mines