PERMFILE67879

• Permit No: M2001090
• IBM Index Class Name: Permit File
• Doc Date: 10/31/2001
• Doc Name: RIVER VALLEY RESOURCES REGULAR 112 ADEQUACY REVIEW FN M-2001-090
• From: DMG
• To: WESTERN MOBILE NORTHERN INC
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Depar(ment of Natural Resources
1313 Sherman SL, Room 215
Denver, Colorado 80203
Phone: [phone]:
FAX: [phone]
November 15, 2001
Mr. Gary Tuttle
Western Mobile Northern, Inc.
1590 W. 12'h Avenue
Denver. CO 80204-3410
RE: River Valley Resources, Regular 112 Application, Additional Adequacy Comments
File No. M-2001-090
Dear Mr. Tuttle:
DIVISION OF
MINERALS
GEOLOGY
RECLAMATION
MINING•SAFETY
bill Owem
Governor
Greg E W'alcher
EAecueve Director
Michael B. Long
Division Dueaor
Listed below are additional adequacy review comments on the above-captioned Regular 1 12
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 may be deemed inadequate and may be denied on
December 11, 2001 unless the following adequacy review items are addressed to the satisfaction
of [he 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 are located within [he
proposed permit area. Please provide a discussion of the maximum pit intlows (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 [o 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 [he existing ditches. It is also important for [he
applicant to demonstrate that the ditches will continue to function as intended, even with the
tlows added from pit dewatering). Please respond.
6.4.5 EXHIBIT E -Reclamation Plan
18. In the event that portions of or all of either the Supple Ditch or the Weiskopf Ditch will be