REP20850

• Permit No: C1982056
• IBM Index Class Name: Report
• Doc Date: 11/27/2006
• Doc Name: 1st Half 2006 Review Letter
• From: DRMS
• To: Twentymile Coal Company
• Permit Index Doc Type: Subsidence Report
• 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]
November 27, 2006
Jerry M. Nettleton '
Environmental Coordinator
Twentymile Coal Company
29515 Routt County Road #27
Oak Creek, CO 80467
Re: Foidel Creek Mine, Permit C-1982-056, First Half 2006 Subsidence Report
Deaz Mr. Nettleton:
COLORADO
DIVISION OF
RECLAMATION
MINING
- &-
SAFETY
Rill Owens
Governor
Russell George
Executive Director
Ronald W. Cattany
Division Director
Natural Resource Tmstee
The Division of Reclamation, Mining and Safety (Division) has initiated a review of the
subject report (undated letter, received at the Division on November 16, 2006). The
report has been determined incomplete as described herein. Please provide the missing
highlighted information. Upon receipt of the missing information, the Division will
complete the review.
Rule 2.05.6(6)(c)(i)(A) Monuments shall be installed and surveyed prior to the
commencement of mining.
The subsidence phenomenon at the Foidel Creek Mine has been well documented, and, as
has been approved in the Permit Application Package (PAP), monuments are only
required under features and structures anticipated to be affected during the reporting
period. No long-wall mining occurred during the reporting period under Fish Creek and
the railroad tracks. In addition, the anticipated angle of draw has been well documented.
Western Area Power Administration and Tri-State/Public Service Company of Colorado
power lines were undermined during the reporting period. The top of concrete of each leg
of each tower structure was defined as monuments (PAP, page 2.05-191.6). Baseline
surveys aze to be accomplished one month prior to undermining and any subsidence
(PAP, page 2.05-191.6).
Item 1. Please add a line that traces the limit of the affects of the angle of draw at the
east end of Panel 19 Right to demonstrate that Fish Creek was not affected by
nearby long-wall mining.
In addition, please establish monuments at the ponds shown in the SW'/o Sec 4, SWYe Sec
5, and N''/4 Sec 9 TSN R86W, in the PAP as appropriate.
Item 2. In the information requested under Rule 2.05.6(6)(c)(i)(E) below, please report
the date that baseline survey(s) of the monuments were accomplished. The text of the
report indicates that survey date had been collected daily starting in May. The Subsidence
Map indicates longwall mining underway (east end of Panel 19) in May.
OKce of Office of
Mined Land Reclamation Active and Inactive Mines