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Fall 2008 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />i <br />5.20 Photographic Observation Point 11 <br />This particular location has been visited on each of the last three field visits and assigned <br />different location numbers. For this reason, this location has now been established as <br />Photographic Observation Point 11 so that continued observations and imagery can be obtained <br />to assess changes that may occur over an extended period of time. <br />Photographic Observation Point 11 was specifically created to view an overhanging cliff and <br />rockfall area near the West Elk Mine load out and stacker facilities which were evaluated in <br />detail during July 2006 (see Map 1). The massive sandstone cliff and overlying ledges are the <br />sandstone that overlies the abandoned Bear Coal Mine located in the C-seam. The massive <br />sandstone is about 40 feet thick. The overlying ledges are an estimated 25 to 30 feet thick. <br />is No noticeable changes were observed in this rockfall area since annual observations were <br />initiated in the summer of 2006. As a result, no photograph was taken at this location during the <br />fall 2008 field visit. <br />5.21 Traverse N-N' <br />Traverse N-N' begins at the fork in the Deer Creek and Dry Fork roads and continues southward <br />up the Deer Creek road to a locked gate near two stock water tanks in the upper Deer Creek <br />drainage near the middle of the NW'/4 of Section 4, Township 14 South, Range 90 West (see <br />Maps 2 and 4). <br />The traverse is above the projected, and unmined, main mine haulageway and above unmined <br />Longwall Panels E3, E4, and E5) near the northwestern edge of unmined Longwall Panel E6. <br />The overburden depth to the E-seam varies from 400 to 500 feet thick. Mostly light reddish gray <br />to light brown soil and alluvium (but some colluvium) derived primarily from clay and silt of the <br />0 Wasatch Formation was observed along the traverse. <br />831-032.790 Wright Water Engineers, Inc. Page 63 <br />December 2008