2012-05-10_REVISION - C1982056 - Laserfiche WebLink

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Peabod I/ 1111 ENERGY Twentymile Coal, LLC Mr. Jason Musick Colorado Division of Reclamation, Mining and Safety 1313 Sherman St., Room 215 Denver, Colorado 80203 303.866.3567 X8134 Re: Minor Revision MR12 -261, WMD 2012 Exploratory Drilling Program Dear Mr. Musick; With this submittal, Twentymile Coal, LLC (TC) is requesting CDRMS approval of a Minor Revision (MR12- 261) to our existing approved Mining and Reclamation Permit, for construction of drill -pads, and drilling and logging of up to 5 exploration drillholes in our active Western Mining District (WMD). The purpose of the proposed exploration program is to more accurately define structural conditions, including faulting, for planning and implementation of ongoing and future mining operations in this area. The proposed activities would occur on lands, and would affect minerals owned or controlled by TC, and would be conducted during the summer and fall of 2012, as shown on Figure EX52 -F1, WMD 2012 Exploratory Drilling Program. Environmental baseline studies, including cultural resource surveys and wildlife consultation with Colorado Parks and Wildlife, have been completed for the proposed drill sites, and will be documented by a cultural resource survey report and willdife consultation letter, which will be forwarded on receipt. Drill -sites have been selected and located to facilitate access from existing County and ranch roads. Where direct access from existing roads is not feasible, drilling equipment and supplies would travel overland short distances during periods when ground conditions are favorable, to access the drill sites. Drill pads would be approximately 75 x 75 feet (0.15 acres), with soil material stripping limited to an area around the drillhole collar, and the area surrounding any mud pits necessary to support drilling operations, in order to minimize disturbance and facilitate site reclamation. Nominal 5.625 -inch drillholes would be completed using conventional rotary drilling methods and drilling mud as the circulation medium, to depths ranging from 1,300 to 1,600 feet. Corehole samples would be recovered from some or all drillholes, and all drillholes would be geophysically logged. On completion of drilling and logging, all drillholes would plugged and sealed in accordance with State Engineer requirements, and drill sites would be reclaimed. This submittal includes revised PAP text and supporting materials, as identified by the accompanying Summary of Revisions /Additions. In order to take advantage of the 2012 summer field season, TC would like to initiate the proposed exploration activities as soon as possible, and therefore, requests the assistance and cooperation of the CDRMS is completing review and approval of this application in a timely manner. Once you have opportunity to review this submittal, please feel free to contact me with any questions, or to discuss the submittal and related matters. We appreciate your attention and assistance. Best re Jerry l ettlet Environs n)/al Manager cc: Mike Berdine /TC Rocky Thompson /PE " 29515 Routt County Road 27 Oak Creek, CO 80467 970.879.3800 May 4, 2012