2014-04-02_REVISION - M1977310

• Permit No: M1977310
• IBM Index Class Name: REVISION
• Doc Date: 4/2/2014
• Doc Name: Revised third adequacy review AM01
• From: Tim Cazier
• To: Stephanie Reigh
• Type & Sequence: AM1
• Email Name: DMC
• Media Type: D
• Archive: No

DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
STATE OF COLORADO
COLORADO
D I V I S ION OF
RECLAMATION
MINING
SAFETY
MEMORANDUM John W. Hickenlooper
Governor
Mike King
Executive Director
Loretta Pineda
To: Stephanie Reigh Director
From: Tim Cazier, P.E. 71
Date: April 2, 2014
Re: JD -6 Mine Drainage Design — Revised Third Adequacy Review, Permit No.
M- 1977 -310 / AM -01
The Division of Reclamation, Mining and Safety (DRMS) engineering staff has reviewed the
October 28, 2013 Drainage Design Plan for the JD -6 Mine prepared by Whetstone Associates,
Inc. The following comments are posed to ensure adequate engineering analyses and design
practices are implemented to eliminate or reduce to the extent practical the disturbance to the
hydrologic balance expected by the mining operation with respect to water quality and quantity
in accordance with Rules 3.1.6(1), 6.4.21(10) and 7.3.1. Please note, as this site is a designated
mining operation (DMO), compliance with Rule 7.3.1 is applicable, thus requiring certified
designs and specifications for engineered elements associated with the environmental protection
plan (EPP). (Note: the site specific technical and engineering content for this submittal is
essentially the same as that submitted for the Mineral Joe Mine. The comments below are very
similar, if not identical to comments on the Mineral Joe submittal, but are submitted separately
as the two sites are separate permits). Please note the original comment number sequence has
been retained for tracking purposes.
Previous Comments:
1. The hydrologic method and analyses... No response required.
2. Page S, section 2.3.1. Trapezoidal channels... Cotter's commitment to reconstruct the
UDS with 3H:1 V side slopes is adequate. No additional response is necessary.
3. Page 6, Cowan's formula. The response is adequate.
4. Cowan's method results in higher Manning's values... The provided response is partially
adequate. Based on various meetings and telephone conversations, I believe it is
understood by all what the expectations by DRMS are for providing hydraulic
evaluations /analyses for both stability (low range of an appropriate Manning's n) and
capacity (high range of an appropriate Manning's n) for each separate reach of channel
where either the channel geometry, longitudinal slope, or design peak flow changes.
Office of Office of
Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines