2013-03-01_REVISION - C1982056 ‎(4)‎

• Permit No: C1982056
• IBM Index Class Name: REVISION
• Doc Date: 3/1/2013
• Doc Name: Letter Application and Public Notice
• From: Twentymile Coal Company
• To: DRMS
• Type & Sequence: TR82
• Email Name: JDM
• Email Name: DIH
• Media Type: D
• Archive: No

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Dear Mr. Musick:
1111 ENERGY
Twentymile Coal, LLC
Mr. Jason Musick, Environmental Protection Specialist
Colorado Division of Reclamation, Mining, and Safety
1313 Sherman Street, Room 215
Denver, Colorado 80203
(303) 866 -3567 Ext, 8134
RECEIVED
MAR 012013
Division of Recismstion,
wing & may
29515 Routt County Road 27
Oak Creek, CO 80467
970.879.3800
RE: Twentymile Coal, LLC, Foidel Creek Mine (C -82 -056) — Technical Revision (TR13 -82)
for Western Mining District Mine Plan Modification
February 28, 2013
$
Twentymile Coal, LLC (TC) respectfully requests CDRMS approval of a Technical Revision to our
existing approved Permit, to modify our approved mine plan for the Western Mining District (WMD)
to make minor changes to the current approved panel configuration and designations, include extension
of the 14 -Left and 13 -Left Panels, add a 12 -Left Panel, and reflect the associated development and
mining of additional coal reserves. The additional panel, and panel extensions to the west, will also
require modification of the Permit Area boundary to encompass the extension areas, associated coal
leases, and potential related subsidence areas, adding approximately 80 acres to the Mine Permit Area.
Mining limits were initially established for the western edge of the WMD based on available
information on coal structure and faulting in this area. Subsequent mining and additional surface and
underground drilling have resulted in better definition of structural constraints and location and
definition of faults and fault offsets. This additional information indicates that longwall panels can
safely be extended further to the west and south, increasing the minable coal reserves, extending mine
life, and resulting in extraction of additional coal which otherwise would never be recovered.
Activities under the proposed mine plan modification will be limited to underground continuous -miner
development and longwall mining, and will not require construction of any new surface facilities.
Preliminary mine development (Phase I) in the WMD (Panels 17 through 18 Left), was addressed in
the PRO6 -07 Permit Revision submittal (approved 01/02/07), with subsequent minor modifications to
adjust alignment and configuration consistent with geologic controls, under TR07 -63 (approved
11/01/07). Phase II development activities, extending to, but not including, the un- leased (at the time)
Federal coal reserves in Sections 21 and 22, T5N, R87W, were approved (10/03/08) under TR07 -64.
TC subsequently acquired Federal Coal Lease No. COC- 72980, and submitted and obtained approval
(10/30/09) of PRO9 -08 addressing Phase III development and longwall mining for the remainder of the
WMD. This Permit Revision submittal tiers off of the previous permit approvals, and includes a
Federal Coal Lease Modification (modification to Federal Lease COC- 72980) to add 40 acres of
Federal coal (submitted on 04/20/12), and a new fee coal lease.
This submittal includes revised PAP text and supporting materials, as identified by the attached
Summary of Revisions /Additions. Please note that since this Permit Revision application only
addresses underground development and mining, and will involve no surface disturbance, there are no
associated impacts on reclamation liability, and no bonding calculations are being submitted with this