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revised mining sequence was prepared. Under this plan, in 1996, South Mains Right was further <br />developed to provide access for room - and - pillar panel RP -1, all longwall gateroads were developed <br />and mining of RP -1 and RP -2 occurred. In 1997, RP -1 and RP -2 were mined out and mining of LW -10 <br />resumed. LW -11 and LW -12 were subsequently mined out and the D -seam sealed in 2000. <br />Development work in the B -seam started in 1997. Longwall mining of the B -seam started in 2000 with <br />LW -1 B. Additional longwall panels are mined as resources are depleted. <br />All the water produced outby the sealed area, from mining as well as natural ground water will be <br />pumped into the mined out and sealed D -seam. Therefore, no surface discharge of this water is likely <br />in the near future. There will be no effects to existing ground water due to storage in these areas. <br />III.A.4 Mining Equipment Because a mixed mining method is planned for the Deserado Mine, two <br />different equipment systems are required, one set for longwall mining and several sets for room and <br />pillar mining. <br />The longwall equipment consists of a shear to cut the coal and an armored conveyor to transport the <br />coal to a stage loader which loads the coal onto the longwall panel conveyor. Shield -type supports are <br />used to provide roof support in the immediate face areas. <br />The room and pillar equipment consists of continuous miner units, each containing a continuous miner, <br />two shuttle cars, one roof bolter and a scoop. <br />Although the coal seams are not expected to produce significant amounts of groundwater, the mine <br />drainage system is designed to dewater the mine quickly enough to prevent any safety hazard to <br />workers or equipment. <br />III.A.5 Roof Control The roof control plan, which has been submitted to and approved by the Federal <br />Mine Safety and Health Administration (MSHA) contains the following provisions: <br />• Entries will be driven on 20 to 150 -foot centers, cross cuts on 50 to 220 -foot centers. <br />Entries and crosscuts will be 16 -22 feet wide. Full extraction may be practical during room <br />and pillar mining. <br />Permit Revision #8 (02/2013) III -7 <br />