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• <br /> <br />• <br />Structure <br />The structural geology of the permit and adjacent area appears to be <br />quite simple. The sedimentary strata of the Mesaverde Formation are <br />relatively flat lying with an average regional dip of 2 to 3 degrees to <br />the south, although limited local dips of up to 5 degrees can be found. <br />No faults have been mapped within the permit area or adjacent area. The <br />generalized geologic structural and stratigraphic setting of the area is <br />shown on the Regional Geology Map (Map 5), and Figure 2, Generalized <br />stratigraphic Column. The site specific stratigraphy is found on the <br />Geology/Hydrology Map (Flap 7). ~~/S~ Soc ~5 2•~'y-iz./~ <br />Site-Specific Geology <br />The "A" Coal Seam roof consists of 10 to 12 feet of shale and sandstone. <br />In general, the roof material is reasonably competent, but is subject to <br />some deterioration when exposed to the cycles of moisture attendant with <br />mine ventilation. <br />The floor of the "A" Coal Seam is characterized by 5 to 12 feet of <br />interbedded sandstones and shales. The floor is sufficiently competent <br />for the operation of mining equipment. <br />The overburden above the "A" Coal Seam varies from around 50 feet near <br />the planned portal location to over 400 feet in areas near the central <br />portion of the permit area. <br />Coal Quality <br />The coal seam to be mined at the Coal Gulch Mine will be the "A" Coal <br />Seam; the quality of the "A" Coal Seam appears to be quite uniform <br />throughout the area. Typical analysis of the "A" Coal Seam nn an <br />as-received basis is as follows: <br />~ p 4 1986, <br />z.oa-lz <br />