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West Elk Mine <br />similaz alternating sequences of shales, claystones, and sandstones. Based on the stratigraphic <br />and lithologic information obtained from drill holes in the South of Divide mining area, the <br />rocks consist of a greater proportion of shales, siltstones, and claystones than are present in the <br />Apache Rocks and Box Canyon mining azeas. <br />• The South of Divide permit revision area is topographically similar to the Apache Rocks <br />and Box Canyon mining areas although with a less extreme range of topographic relief. The <br />elevation range across the South of Divide permit revision area is from about 7,000 feet to <br />approximately 8,400 feet with fewer abrupt elevation changes than those seen in the <br />Apache Rocks and Box Canyon permit areas, such as between the Sylvester Gulch <br />drainages and West Flatiron. Like these two previously permitted areas, the South of <br />Divide permit revision area contains gentle as well as steep slopes making it susceptible to <br />rockfalls and landslides. <br />• Expected subsidence characteristics of the South of Divide permit revision area, based on <br />lithology and topography, do not vary significantly from previous evaluations for B Seam <br />mining according to Mr. Dunrud, with the obvious exception of the reduced overburden <br />thicknesses associated with mining of the E Seam. Overburden thickness impacts will be <br />discussed later in this section. <br />Based upon these similarities, much of the information contained within the documents <br />pertaining to the Apache Rocks and Box Canyon permit revision azea is applicable to the South <br />of Divide permit revision area. Where differences occur, discussion of the resulting effects have <br />been provided. <br />Inventory of Structures and Renewable Resource Lands - 2.05.6 (6)(a)(i & ii) <br />In order to ascertain the impacts that subsidence will cause on structures and renewable resource <br />lands, an inventory of these features was conducted. Projected impacts to surface and ground <br />water resources aze presented later in Section 2.05.6(3). These water resources aze shown on <br />Map 37. MCC's hydrologic monitoring stations and the many trails and unimproved U.S. Forest <br />Service roads utilized to access these sites are shown on Map 34. <br />Man-made surface structures exist on the coal lease azea and within the South of Divide permit <br />revision azea (Exhibit 32B and Map 67). The only known structures which are currently used <br />(intermittent seasonal use) are a cattle camp on the Dry Fork of Minnesota Creek with a <br />wood-framed building on a concrete slab completed by the landowner in October 1994 and a <br />smaller wood-framed building and livestock enclosure constructed in November, 1995. A <br />deteriorated and collapsed cabin exists in Sylvester Gulch, and the remnants of soil and stone <br />foundations of two buildings exist on a small bench overlooking the mine portal. The remains of <br />three log structures, possibly a cabin, barn and shed, are located in Lone Pine Gulch. Several <br />similar abandoned structures exist on the Jumbo Mountain lease tract (see Exhibit l0A and Exhibit <br />lOB). Other abandoned structures in the pernut azea, aze described in the Cultural Resources <br />Reports in Exhibits 10, 10A, IOB, lOC, lOD, and 10E. No subsidence-related impacts to these <br />"structures" is projected or anticipated. <br />2.05-96 Revised November 2004 PRIO <br />