Laserfiche WebLink
<br /> <br />reported and repaired prior to its use. <br />b. Drills and other equipment working near the <br />edge of highwalls or other banks shall operate <br />at safe distances from the edge. Safety berms <br />shall be provided when necessary to assure <br />safe operation. <br />3. Prestripping Activity <br />a. Prior to the actual stripping the area will be <br />cleared of all vegetation matter, drill benches <br />established, vertical blast holes will be drill- <br />ed and the overburden material will be broken <br />using explosives. <br />4. Mining Activity <br />a. The mining method used is an open pit, loader <br />truck combination with an overburden dump <br />initially and a-back fill operation there- <br />after. <br />b. The overburden will be removed in 25 feet high <br />lifts or benches. These active faces or bench <br />slopes will be nearly vertical as the rock can <br />maintain a steep wall for short heights. At <br />no time will overhanging rock be allowed to <br />remain at the working face. <br />c. Highwall slopes on the south and east edge of <br />pit shall not generally exceed 72 degrees at <br />shallow depths. At maximum depth the high- <br />wall will have an effective slope of 63 degrees. <br />See highwall design (figure B). <br />d. Highwall slopes on the north edge of the pit <br />will result from removal of the ("C") seam of <br />coal and will be approximately 26 degrees. <br />e, Loose material will be scaled to a safe distance <br />from the edge of the highwalls and the hazardous <br />material sloped to a safe angle of stability. <br />f. Benches on the highwall shall be at a safe width <br />governed by the type of equipment operating on <br />them and the work being performed. <br />g. Ramps will be provided for coal and overburden <br />haulage. The slope of these ramps shall be <br />determined by equipment being used, but shall <br />be maximized to provide a minimum of truck <br />time in the pit. <br />h. Overburden spoil will be placed in a durable <br />rock fill in an area outside the pit initially. <br />The fill will have an angle of repose not <br />generally greater than 38 degrees, when dump- <br />ing on the fill, adequate width shall be pro- <br />vided to assure safe operation of the equipment. <br />i. After adequate room has been established in the <br />