Laserfiche WebLink
RECLAMATION - BENCHES <br /> No. 2 Bench <br /> Geo-Hydro's Documentation: <br /> • No. 2 Bench is a small cut and fill bench, approximately 400' long, to the <br /> northeast of Mine No. 1. <br /> • The cut is along the northwest edge of the bench, in Mesaverde sandstone <br /> and shale. The cut ranges from 20' to 50' in height and 500 to 900 in slope <br /> angle. Minor to moderate sloughing and rockfall are present in the cut. <br /> Above the cut is a sloping berm for the conveyor from Mine No. 1. <br /> The fill below the bench, to the southeast and northeast has a maximum <br /> height of 20', and a slope angle of 300 to 350. The fill is probably a shallow <br /> sliver, except perhaps at the north end of the bench. <br /> Reclamation -Application of Methods <br /> A buttress will be constructed along the base of the cut. <br /> Buildings still remaining at the site on closure of the mine, as well as <br /> foundations, will be utilized in construction of the buttress. The foundations will <br /> be rubblized and, together with the dismantled structures, placed against the <br /> toe of each cut, along the length of the toe, together with any rock and/or soil <br /> which has fallen from the crest of the cut. <br /> Material will then be placed over the rubble, compacted and contoured. Rock <br /> from the crest of each cut will be allowed to fall on the buttress. It is anticipated <br /> that material from reclamation on the fill at the bench will be utilized in <br /> constructing the buttress for the toe. <br /> The dimensions of the buttress will be determined by considerations of stability, <br /> so as to allow a factor of safety of 1.3. <br /> Further disturbance to the crest of the cut is not contemplated. Along the <br /> perimeter of the bench, the angle of the edge will be flattened to a slope of <br /> 1.5:1, or flatter. Material taken from flattening the perimeter of the bench will be <br /> used in construction of the buttress along the cut. <br /> In order to increase the stability of the fill, a berm will be constructed above the <br /> flattened slope around the outside perimeter of the bench. Further back, and <br /> 11 <br />