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1111 Peabodq <br />Twentymile Coal, LLC <br />29515 Routt County Road 27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />Mr. Jason Musick November 5, 2013 <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />303.866.3567 X8134 RECEoVED <br />Re: Minor Revision MR13 -269, TRO Coal Quality Coreholes Nod p 7 2013 <br />Dear DMSION OF RECLWAIICA <br />Mr. Musick; MINING �ND SAFEN <br />With this submittal, Twentymile Coal, LLC (TC) is requesting CDRMS approval of a Minor Revision <br />(MR13 -269) to our existing approved Mining and Reclamation Permit, for access development, <br />construction of drill -pads, and drilling and logging of up to 4 coreholes in our Eastern Mining District <br />(EMD). The purpose of the proposed corehole program is to more accurately define the extent, <br />configuration, and quality of the Wolf Creek Coal Seam, and to assess overburden and coal physical <br />and chemical characteristics, for planning and implementation of possible future mining operations in <br />this area. The proposed activities will occur on lands, and will affect surface and minerals owned or <br />controlled by TC, and will be conducted during the fall and winter of 2013, as shown on Figure EX52- <br />F1. TRO Coal Quality Coreholes. Environmental baseline studies, including cultural resource surveys <br />and wildlife consultation with Colorado Parks and Wildlife, have been completed for the proposed drill <br />sites, and will be documented by a cultural resource survey report and wildlife consultation letter, <br />which will be forwarded on receipt. <br />Drill -sites have been selected and located to facilitate access from existing County and ranch roads. <br />Minor maintenance may be required for portions of the existing ranch roads, including grading to <br />address rills or washouts and placement of suitable road -base materials, to assure good access during <br />any wet conditions and minimize any road damage. Where direct access from existing roads is not <br />feasible, drilling equipment and supplies may travel overland short distances during periods when <br />ground conditions are favorable to access the drill sites, or short temporary connecting roads will be <br />constructed. The maximum anticipated road construction requirements will be approximately 1,500 <br />feet (0.90 acres with a 25 ft. road width). <br />Drill pads will be approximately 75 x 75 feet (0.15 acres), with soil material stripping limited to an <br />area around the drillhole collar, and the area surrounding any mud pits necessary to support drilling <br />operations, in order to minimize disturbance and facilitate site reclamation. If additional site work is <br />required to establish a level pad, any affected areas will be stripped and the soil material stockpiled for use in <br />reclaiming the site. Wattles, sediment fence, and /or berms will be used to control site drainage and prevent off- <br />site sediment transport. Nominal 4.805 -inch drillholes will be completed using conventional rotary <br />drilling methods and drilling mud as the circulation medium, to depths ranging from 800 to 1,500 feet. <br />Core samples will be recovered from all drillholes. and all drillholes will be geophysically logged. On <br />completion of drilling and logging. all drillholes will be plugged and sealed in accordance with State <br />Engineer requirements. and drill sites will be reclaimed. <br />