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Sc+Yiar - 2.05.3 <br />Coal Screening Facility -The coal stockpile reclaim conveyor will discharge to a new coal screening <br />• installation corutructed adjacent to the existing dump station. The screening installation's main <br />function is to segregate product-sized (-2-inch) material which can then bypass the crusher m order to <br />rtiarm~>e overall system capacities. The screenurg installation will consist of a single double-deck <br />screen that initially (upper screen deck) screens off the oversize material (+8-inch) which is diverted <br />to the existing 125-ton nxk bin in the dump station. Undersized material passes through the second <br />screen (lower screen deck) to a new crusher bypass conveyor and the intermediate material (-8-inch to <br />+2-inch) discharges to the existing 400-ton coal bin and is fed to the crusher installation via the <br />existing crusher feed conveyor. The oversize waste material is recovered from the rock bin by front- <br />end loader for disposal in the existing active coal refuse and development waste disposal area. <br />Based on typical run-of-mine coal size consist, approximately two thirds of the coal will pass through <br />both screen decks, leaving slightly less than one third to be transferred to the crusher for further size <br />reduction. The coal screening installation is fully enclosed within apre-fabricated steel building for <br />dust control. Any appropriate supplemental duct control measures will be applied to assure <br />compliance with applicable provisions of the air emissions permit for the screening facility. <br />The existing crusher feed conveyor runs from the coal bin in the existing dump station to the crusher <br />installation located in the tipple facility. This conveyor tames the intermediate coal product from the <br />coal bin to the crusher for size reduction to the -2-inch final product size. The new crusher bypass <br />conveyor, constructed from the screening installation to the tipple carries the screen undersize which <br />does not require crushing. The crusher bypass conveyor discharges at the same point as the crusher <br />discharge to the silo feed conveyor. Both the crusher feed and bypass conveyors include partial <br />covers for dust control, walkways, and emergency stop controls for inspection and maintenance in <br />compliance with applicable MSI-IA safety regulations. Coal transfer poinu are alto partially or fully <br />enclosed for duct control. <br />• Dump Station -The dump station receives run-of-mine coal and coal refuse or mine development <br />waste, as an intermediate facility, for temporary storage and transfer to ocher locations. The dump <br />station is a concrete structure with a rock bin, coal bin, structural steel cover, concrete truck ramp, and <br />belt conveyor from the coal bin. The tack and coal bins are below grade and partially enclosed. The <br />structural steel cover acts as a partial enclosure to n,ini.rn>P wind exposure and dust dispersion from <br />truck unloading. In early 1990, a [tuck scale eras added on the east side of this facility. The truck scale <br />is a Cardinal, 10-foot by 60-foot, platform scale with a 60 ton capacity. Dttrittg 1991 the dump station <br />was modified to allow trucks to drive through the stntcture in a east to west direction. This provides <br />for an efficient haul cycle because the trucks can tun on the scale to be weighed then proceed directly <br />through the dump station where the coal is unloaded. <br />Tipple and Crusher -The tipple is a steel structure on a concrete foundation which receives the <br />screened coal from the screening facility and dtrrrtp station via conveyor belts for crushing and <br />transfer to the coal silo. A double roll crusher housed in the tipple reduces the intermediate coal <br />product from the screening facility to -2-inch product size. The crasher was modified during the <br />1997-1998 coal handling system modification to increase iu throughput capacity to approximately <br />1,500 tons per hour. The tipple was also modified to accommodate the bypass conveyor from the <br />new screening installation and an increase in the size of the silo feed conveyor. The silo transfer <br />conveyor transfers coal from the crusher discharge and crusher bypass conveyor to the silo headhouse <br />at the top of the coal storage sdo. Associated with the tipple is a fenced transformer station and a <br />wood frame control building. <br />Coal Storage Silo -The coal storage silo is a 72-foot diameter, 145- foot high cylindrical steel- <br />reinforeed concrete structure on a concrete foundation. The silo receives crushed and screened coal <br />• from the tipple via the silo transfer conveyor. The silo can temporarily store approximately 8,000 tons <br />coal for shipment by unit train. Previously, coal was loaded directly to traias from discharge chutes in <br />the base of the silo as the train passed under the silo. In conjunttion with modification of the surface <br />coal handling system, however, the silo was modified to serve as an intermediate storage and feed <br />PR04 2.05-43 Revised August 2000 <br />