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<br />Golden Eagle Mine <br />NW-1 Exhaust Ventilation Shaft Construction <br />75.200 Roof Control Plan Amendment <br />General Description: <br />The NW-1 shaft will be constructed by raise boring to the full <br />diameter of 9 feet 3 inches and lined to approximately 8 feet. <br />The shaft will be located in the bleeder entries of the <br />Northwest longwall panels. <br />Prea_aration: <br />The shaft bottom area will be developed with a conti..ucus <br />miner as part of the mine development and supported with fully <br />resin grouted 3 foot roof bolts. To facilitate the assembly <br />of the raise head, the shaft bottom will require an excavation <br />approximately 12 feet x 12 feet x 8 feet high (minimum). The <br />excavation will be accomplished by continuous miner. The top <br />of the excavation will be bolted with mechanical roof bolts <br />(specifications located in the approved Roof Control Plan). <br />The roof bolt pattern for the top of the raise head assembly <br />area will be 4 feet by 4 feet with 5 foot roof bolts. The <br />mechanical roof bolts and plates will require removal prior to <br />reaming. Removal of the mechanical bolts will be accomplished <br />by setting a prop immediately adjacent to the bclt prior to <br />its removal. The props will be set on the reamer ~ead and <br />will fall out when the reamer head is rotated The <br />installation and removal of the roof bolts will be from <br />beneath supported roof. The brow at each approach will be <br />knocked off, creating a air sweep. The anticipated dimensions <br />are less than 2 feet vertical by 2 feet horizontal. <br />'Drawing attached (Roof Bolt Pattern - Raise Head Assembly <br />Area). <br />Shaft Excavation: <br />During the excavation or reaming phase, the shaft bottom will <br />contain cuttings to be removed by diesel scoops or .continuous <br />miner and shuttle cars. The .minimum distance from the <br />vertical shaft wall to the operator will be 8 feet. This will <br />prevent the raise bore from becoming muck bound and elimir..ate <br />the operator from exposure to falling cuttings. The cuttings <br />gill not be allowed- to accumulate in the shaft bottom. The <br />cuttings will be permanently stored underground near the sha`_t <br />bottom (identified on map). No combustible material (coal) <br />will be stockpiled underground. To prevent interrupting <br />ventilation in the stockpile areas, the muck will not be <br />allowed to roof out. <br />Y <br />. Revised i!13/91 <br />NGi-i Rxfi?.lct C'fngri <br /> <br />~~P~O~~D CAS ~ H a ~~ ~,~ ~ '~ <br />