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Peabo 1111 ENERGY <br /> Twentymile Coal, LL <br /> ppR 1 3 2015 29515 County Road 27 <br /> Oak Creek,CO 80467 <br /> 970.879.3800 <br /> °f e 1On, <br /> Mining Mr. Jared Ebert pivis�°n &Sa ety April 6, 2015 <br /> Colorado Division of Reclamation, Mining and Safety <br /> 1313 Sherman St., Room 215 <br /> Denver, Colorado 80203 <br /> 303.866.3567 X8120 <br /> Re: Minor Revision MR15-287, WCR Offset Drill Zones III and WC-030 <br /> Dear Mr. Ebert; <br /> With this submittal, Twentymile Coal, LLC (TC) is requesting CDRMS approval of a Minor Revision <br /> (MR15-287) to our existing approved Mining and Reclamation Permit, for access development, <br /> construction of drill-pads, and drilling and logging of up to seven additional coreholes in our Eastern <br /> Mining District(EMD) and one additional corehole in our Northern Mining District(NMD). <br /> Previous drilling to define and characterize the Wolf Creek Reserve (WCR) in this area has identified <br /> sand channels within the defined reserve block. In order to delineate and assess the location and extent <br /> of the channel deposits, TC has identified several parallel zones where offset drilling will be used to <br /> locate channel intercepts. Because the thickness and characteristics of the drillhole intercepts will <br /> determine the location and spacing of the offset drillholes, TC has defined the limits of the drilling <br /> zones, the maximum number and depth of drillholes to be completed, and the maximum total footage <br /> of access road required. TC also plans to drill one additional corehole to define coal thickness and <br /> conditions as the basis for adjustment of the alignment of the main entries for the northern portion of <br /> the WCR. The proposed activities will occur on lands, and will affect surface and minerals owned or <br /> controlled by TC as shown on Figure EX52-F6, WCR Offset Drilling, and will be conducted during <br /> summer and fall 2015, with some activities potentially extending into spring and early summer 2016 <br /> (reclamation activities). <br /> In order to minimize any potential environmental impacts associated with the proposed drilling, TC <br /> reviewed the most recent grouse lek mapping (the identified drilling zones and access routes generally <br /> avoid grouse exclusion areas, and where there is overlap, any activities would be scheduled outside of <br /> the strutting and nesting period), initiated a CPW wildlife consultation, contracted a cultural resource <br /> survey of all drill zones and associated access, and will specifically avoid any stream buffer zones <br /> when locating drill pads. These environmental analysis activities will be documented by a cultural <br /> resource survey report and wildlife consultation letter, which will be forwarded on receipt <br /> Given the location and coverage of existing network of mine and ranch roads in the proposed drilling <br /> areas, most drill-sites will be accessed from existing County, mine, and ranch roads. Minor <br /> maintenance may be required for portions of the existing ranch roads, including grading to address rills <br /> or washouts and placement of suitable road-base materials or rock/gravel, 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 />