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The principal equipment that will be used to <br /> drive the rock tunnel will be: <br /> Main ventilating fan, 4-foot diameter <br /> Auxiliary ventilating fan, underground <br /> Load-haul dump unit, diesel-powered <br /> Eimco - Secoma Bolter <br /> Eimco - Secoma Roof Bolter <br /> Eimco 980-T27 Diesel Trucks <br /> Twin Boom Joy Jumbo Drills <br /> High explosives will be used to break the <br /> rock at the face underground. All surface blasting associated <br /> with the project has been completed. Crosscuts (connections <br /> between the parallel bores) for ventilation and for haulage will <br /> be driven at intervals of not more than 500 feet. <br /> A permanent mine office/lamp house/change <br /> room will be constructed after the completion of the underground <br /> drivage and construction. Coal transported to the surface through <br /> the rock tunnel will be transferred to the new overland belt <br /> system and conveyed directly to the preparation plant. The <br /> overland conveyor project will upgrade the raw-coal storage. <br /> The existing mine portals and haul roads will <br /> be generally retained, but the level of activity will be greatly <br /> reduced. The various mine portals at all mines are critical to <br /> the mine ventilation system, and some as escapeways. From time <br /> to time they will require some maintenance as do the main mine <br /> slopes, which are also critical to the main ventilating system. <br /> The present mine hoists and main line belts will be retained on a <br /> 33 <br />