2011-02-08_REVISION - C1981008

• Permit No: C1981008
• IBM Index Class Name: Revision
• Doc Date: 2/8/2011
• Doc Name: Preliminary Adequacy Review
• From: DRMS
• To: Greg Lewicki & Associates
• Type & Sequence: MR79
• Email Name: MLT
• Email Name: SB1
• 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]
s r •
MINING
SAFETY
8 February 2011
John W. Hickenlooper
Governor
Ben Langenfeld, E.I.T.
Mike King
Greg Lewicki and Associates
Executive Director
11541 Warrington
ton Court
Loretta E. Pineda
Director
Parker, Colorado 80138
Re: New Horizon Mine — Permit No. C -1981 -008
Minor Revision No. 79 (MR -79) Mitigation of Differential Settling — W of 2700 Road
Preliminary Adequacy Review
Dear Mr. Langenfeld:
The Division received your application, on behalf of Western Fuels — Colorado, LLC, for MR -79
on 5- Jan - 2011„ and determined it to be complete for purposes of filing on 28- Jan -2011. The
application was submitted in response to the Division's 8- Dec -2010 Midterm Permit Review
Adequacy Question No. 1, which consisted of the following:
Areas east of 2700 Road that have been previously reclaimed to Irrigated Pasture post -
mining land use have been observed to exhibit some localized settling with the passage of
time, creating minor depressions on the ground surface. Please provide a description of
the mitigative methods proposed by WFC to address any localized settling that may occur
on reclaimed lands west of 2700 Road during the liability period.
The MR -79 application proposes the addition of a new Subsection 13.4 to Section 2.05.4(2)(d) of
the permit. Separate methods of mitigation have been proposed for Reclaimed Irrigated Pasture
(IP) and Reclaimed Irrigated Cropland (IC) lands. The Division has reviewed the text provided,
and makes the following adequacy comments.
1. Subsection 13.4 has been titled, "Potential Field Subsidence Management Plan," and the term
"subsidence" is also used within the proposed text. In coal mining regulations, "subsidence"
is typically associated with surface effects resulting from underground mining. The Division
suggests that "differential settling" is a more accurate description of the features that
sometimes appear on irrigated lands. Please revise the terminology used in subsection 13.4
to refer to differential settling rather than subsidence.
2. In the first sentence of the IP section, please insert the words "a layer of ' prior to the words
"Bench I ".
Office of Office of
Mined land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines