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Fall 2013 Subsidence and Geologic Field Observations <br />South of Divide and Dry Fork Mining Areas (E -Seam) <br />Exhibit 60 through 60E of the current permit issued by the CDRMS. That same information is not <br />contained in this Fall 2013 Report. <br />Prior field observations and experience in the West Elk Mine area over the last eighteen years <br />(1996 to 2013 inclusive) indicate that subsidence features (cracks and bulges) are most visible on <br />roads and trails, where the ground is more compact and free of brush. These areas were therefore <br />selected for observation to most efficiently obtain maximum subsidence information. Larger <br />subsidence features like rockfalls and landslides are generally observable from roads and trails or <br />from overview locations which have, and continue to be, established for this purpose. <br />In keeping with a reduction in report size, this Fall 2013 Report focuses on the identification and <br />discussion of those observations which reflect an obvious change in the observed conditions <br />overlying the mine and on documenting baseline conditions in areas that have yet to be mined. As <br />described in the Spring 2013 Report, subsidence observations in the mined B -seam longwall <br />mining areas of Apache Rocks and Box Canyon have been discontinued and will not be visited <br />again for this purpose unless conditions substantially change. As a consequence, previously - <br />provided mapping associated with B -seam longwall mining have been excluded from this report. <br />These maps can be found in reports prior to 2013. <br />2Annual subsidence and geologic hazard reports are kept at Mountain Coal Company, LLC and at the Colorado <br />Division of Reclamation, Mining, and Safety, as well as exhibits to the permit document (Exhibits 60, 60A, 6013, <br />60C, 60D, and 60E). <br />831 - 032.795 Wright Water Engineers, Inc. Page 2 <br />January 2014 <br />