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• strike of the bedding. Dips of the joints are generally greater <br />than 80°. The associated shale and coal beds seem to be similarly <br />jointed. <br />No evidence of faulting has been observed in the mine area <br />itself, but there may be some local slumping caused by the removal <br />of support as underlying coal beds were burned back from the <br />outcrop. <br />Hiahwall(s)• <br />Colowyo Coal Company will adhere to the procedures outlined in <br />MSHA regulations Subpart K §77.1001 - §77.1006. <br />The height of the highwall(s) ranges from 9 feet to 450 feet. <br />Any overhanging highwall or bench will be taken down promptly or <br />the area posted. The proposed angle of the individual highwall <br />• benches will be less than approximately 80° (see Exhibit A). The <br />proposed overall angle of the temporary re-cut spoil banks will be <br />a maximum of 55° up to 100 foot bank height, or a maximum of 50° <br />for banks over 100 feet in height. The proposed final spoil bank <br />slopes will be a maximum of 26.57° (2h to lv). <br />The minimum width of the pit bottom will be 90 feet, with a <br />maximum width of 300 feet. <br />Highwalls in active mining areas are usually controlled by <br />using the overburden removal equipment to scale and remove all <br />loose materials. <br />The highwall below the Az Seam will be left at an overall <br /> slope of about 65° or less from the crest of the B Parting to the <br />• toe of the F Seam. Work near a highwall will be done only in areas <br />2 <br />