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• Air Pernw Appficonan jar Lorencito Cad Comymiy <br />control structure. The top of the fill and the benches will be graded to direct run off to the rock <br />drains. <br />Spoil Transportation Zones <br />Spoil transportation zones are areas adjacent to the fills and below the coal seams mined. They <br />are shown on Figure 2. Overburden will be transported over the areas by dozer or gravity for <br />final placement in the fill. Overburden will be transported only over these areas, no coal will be <br />recovered inside the zones. After the overburden is transported over these zones, they will be <br />restored to their original contour. No material will be stored in these zones. Following <br />overburden removal and placement, the zones will be walked with a dozer to min;m;~e erosion, <br />topsoil replaced, and seeded. The area covered by the zones is considered disturbed and treated <br />as such in sediment control and reclamation calculations. <br />Underground Mines <br />Underground mine portals will be established at the P-3 and R-1 sites (Figtu•e 2). Since the coal <br />outcrops in these areas, portals will access directly into the coal. The R-2 portal will be used for <br />ventilation and man supply access but will not be constructed until year five or six of the mine <br />• plan. Due to the small size of the underground workings at each of the mines, no other ventilation <br />or air shafts will be necessary. A box cut will access the coal seam at the P-1/ P-2 Mines. The <br />mines will share the box cut. Additional ventilation and personnel access facilities are not planned <br />at this time but may be necessary should mining and economic conditions warrant. If needed, <br />these facilities would not be constructed until the third permit term or later. <br />At the P-3 and R-1 portal sites, access from the surface to the coal seam is provided by four <br />portals expanding to a seven entry system underground. Portal openings will bepre-cast concrete <br />extending 20 feet away from the highwall face-up. A 25 foot safety bench will be located above <br />the portals at approximately 35 feet above the coal. Slopes above the bench will be cut at 2.SH:1V. <br />Of the four portals, two will be used for ventilation with one entry equipped with a 150 <br />horsepower exhaust fan. The other two portals will be used for man supply access and coal <br />production. <br />Underground mining will include room and pillaz development with one continuous miner section <br />per underground mine. Production will be conducted on two shifts with maintenance conducted <br />on the third shift. Production at the P-3 underground mine is estimated to be 35,000 tons per <br />month. Production at the R-1 portal is estimated to be 27,000 tons per month. There will be a total <br />of 255 production days per year. Support equipment to be used underground will include a <br />continuous miner, 48 inch production belt, battery or electric shuttle cars or continuous haulage <br />equipment, two roof bolters, diesel powered rubber tired mantrips, scoops, supply vehicles with <br />• trailers, and two shuttle vehicles. <br />Coal will be brought to the surface by 48 inch belt to a 60 foot radial stacker. The coal pile at the <br />portal will be large enough to hold approximately one to two days production (approximately <br /> <br />