2008-07-11_PERMIT FILE - M2007044 ‎(7)‎

• Permit No: M2007044
• IBM Index Class Name: PERMIT FILE
• Doc Date: 7/11/2008
• Doc Name: Appendix J, K, and L ‎(volume 2)‎
• From: Energy Fuels Resources Corp
• To: DRMS
• Email Name: GRM
• Media Type: D
• Archive: No

Golder Associates Inc.
44 Union Boulevard, Suite 300
Lakewood. CO USA 80228
Telephone [phone]
Fax [phone]
•

January 11, 2008
Energy Fuels Resources Corp.
44 Union Blvd., Suite 600
Lakewood, Colorado 80228
Attention: Mr. Frank Filas P.E. Environmental Manager
Goldex
?ciaWs
Our Ref.: 073-81745
RE: ENGINEERED LINER DESIGN FOR THE ORE STOCKPILE PAD, WHIRLWIND
MINE, COLORADO
Dear Frank:
Golder Associates Inc. (Golder) has prepared this letter report in support of permitting efforts for the
Whirlwind Mine located in Mesa County, Colorado, on behalf of Energy Fuels Resources
Corporation (EFRC). This report presents engineered liner design recommendations for the 0.5-acre
ore stockpile pad at the project.
BACKGROUND
The State of Colorado Division of Reclamation, Mining, & Safety (DRMS) is requiring that EFRC
provide an engineered liner system design for the on-site uranium ore stockpile pad at the Whirlwind
Mine. The ore stockpile pad was originally designed to be constructed of compacted run-of-mine
(ROM) waste rock that would be excavated and placed back in the mine at the time of mine closure.
With the addition of an engineered liner, the DRMS has agreed to allow ore stockpiling on site for
more than six months. The Whirlwind Mine and other EFRC mine properties are relatively small and
remote sites; therefore, Golder is proposing a simple, straightforward design that can be constructed
using common construction and mine equipment. The design is intended to be generic so that it may
be used at other similar sites with only minor site-specific modifications.
The Whirlwind Project is proposed to include a 0.5-acre ore stockpile pad. The ore materials
anticipated for storage at the Whirlwind Project are non-acid generating, with ore derived from the
Salt Wash Unit of the Morrison Formation. The ore stockpile will be constructed near the mine portal
and will be accessed via loaders and trucks on a consistent basis. One or more stockpiles will be
placed on the pad to a maximum height of 30 feet. The proposed location of the ore stockpile pad is
illustrated in Figure 1. The ore stockpile pad will be surrounded by berms on all sides to provide
drainage isolation, with the base of the pad sloped to the northwest toward a concrete sump which
overflows into a water treatment tank.
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