PERMFILE133525

• Permit No: M2001090
• IBM Index Class Name: Permit File
• Doc Date: 11/15/2001
• Doc Name: RIVER VALLEY RESOURCES REGULAR 112 APPLICATION ADDITIONAL ADEQUACY COMMENTS FN M-2001-090
• From: DMG
• To: WESTERN MOBILE NORTHERN INC
• Media Type: D
• Archive: No

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DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman St., Roam 215
Denver, Colorado 80203
Phone: [phone]
FA%: [phone]
November 15, 2001
DIVISION O F
MINERALS
GEOLOGY
0.EC LAM ATION
MI NING•SAFETY
Bill Owens
Mr. Gary Tuttle Governor
Greg E. Walther
Western Mobile Northern, h7C. Executive Director
1590 W. 12's Avenue Michael B. Long
Denver, CO 80204-3410 Division Direclar
RE: River Valley Resources, Regular 112 Application, Additional Adequacy Comments
File No. M-2001-090
Deaz Mr. Tuttle:
Listed below aze additional adequacy review corrunents on the above-captioned Regular 112
Application for 105.41 acres. The decision date for your application is scheduled for December
11, 2001. Therefore, I would appreciate a response from you on or before November 23, 2001.
Please be advised that your application maybe deemed inadequate and may be denied on
December 11, 2001 unless the following adequacy review items are addressed to the satisfaction
of the Division.
6.4.4 EXHIBIT D -Mining Plan
17. The mine plan specifies dewatering and dry mining methods. During the Division's recent
pre-operation inspection the matter of pit dewatering and offsite discharge was discussed. The
applicant mentioned that groundwater from pit dewatering activities would be discharged directly
into either the Weiskopf Ditch or the Supple Ditch, both of which aze located within the
proposed permit area. Please provide a discussion of the maximum pit inflows (volume and rate)
expected, the expected discharge rate needed to sustain a proper water balance during mining, the
total capacity of the Weiskopf Ditch and the Supple Ditch, and the available capacity of the
Weiskopf Ditch and the Supple Ditch. (It is important for the applicant to demonstrate that the
expected volume of water to be discharged offsite from pit dewatering can be safely discharged
without causing excessive erosion or flooding of the existing ditches. It is also important for the
applicant to demonstrate that the ditches will continue to function as intended, even with the
flows added from pit dewatering). Please respond.
6.4.5 EXHIBIT E -Reclamation Plan
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18. In the event that portions of or all of either the Supple Ditch or the Weiskopf Ditch will be