2011-01-20_REVISION - C1980007 ‎(2)‎

• Permit No: C1980007
• IBM Index Class Name: REVISION
• Doc Date: 1/20/2011
• Doc Name: Review & Comments and Responses
• From: DRMS
• To: Mountain Coal Company
• Type & Sequence: TR124
• Email Name: TAK
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
January 20, 2011
Kathleen G. Welt
Mountain Coal Company, LLC
P.O. Box 591
Somerset, CO 81434
Re: West Elk Mine
Technical Revison No. 124 (TR-124)
Addition of Maximum Projected Areal Extent of Potential Mining
Dear Ms. Welt:
COLORADO
D I V I S ION OF
RECLAMATION
MINING
SAFETY
John W. Hickenlooper
Governor
Mike King
Executive Director
Loretta E. Pineda
Director
The DRMS has reviewed your letter of January 14, 2011 that you submitted in response to our
preliminary adequacy review letter of December 22, 2010.
Your responses to our comments 2 through 5, 7, and 8 are adequate. We have the follow-up comments,
below, which correspond in numbering to our previous comments and your responses.
1. Please add to Table 8 of Exhibit 71 baseline monitoring of the springs located in SE % Section 2-
R14S-R90W. The current baseline monitoring plan in Exhibit 71 was based on the mine plan
approved in PR-12, which did not include the longwall panel extensions proposed in TR-124 (see
Section 5.0 of the Exhibit 71).
6. To make it clear that mining will be approved only within the Projected Potential Mining Area as
that area is shown on Map 51, please remove the word "approximate" from page 1 of Exhibit 55B
and page 1 of Exhibit 60E.
9.
a) On your submitted page 2.05-170, immediately after the words ".additional reflector stations
will be added", please add the words "at approximately 300-foot spacing along the entire
length of the portion of the Deep Creek Ditch that will be undermined upstream from the
aforementioned five stations".
b) Please update the monitoring and repair plan for the Deep Creek Ditch in Section
2.05.6(6)(f)(iii) of the permit application to include the additional section of the ditch that may
be undermined in the Projected Potential Mining Area.
c) Please either direct us to or add to the appropriate places in the permit application a prediction
of the worst possible consequences from subsidence and a monitoring plan for the Deep Creek
Ditch Flume (the ditch's elevated steel pipeline that crosses Deep Creek and the concrete
collection box at the pipeline outlet).
Office of Office of
Mined Land Reclamation Denver • Grand Junction 9 Durango Active and Inactive Mines