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<br />T83b144 <br />The shalt: will be mined using a backhoe. The three cubic yard capacity backhoe bucket <br />will break up and remove the shale. The backhoe will deposit the shale into a 35 ton <br />capacity truck. Once filled, the truck will travel the haul road to afeeder-breaker <br />operation in the quarry and drop the shale into the feeder-breaker. The truck will <br />return to the backhoe for another load. <br />The feeder-breaker will reduce the size of the shale material to minus 5 inches. After <br />passing through the feeder-breaker, the material is conveyed to the secondary crusher <br />where the; shale is reduced in size to 1" x t/q" kiln feed material and the minus t/q" <br />portion will be extruded into t/Z' pellets. After the shale is processed through the <br />secondary crusher and extruded it is conveyed to the raw shale storage bins east of <br />Highway 93 at the processing plant. The feeder-breaker and its conveyor will be per- <br />iodically :relocated to remain near the backhoe/truck operation to minimize haul dis- <br />tances. <br />Sufficient shale is presently exposed to satisfy the manufacture of the aggregate for a <br />period of approximately 8 to 10 years. After this period, the quarry will be extended <br />southward.. Overburden will be removed using scrapers. The scrapers will remove the <br />overburden and deposit it into the mined areas of the pit and will be used immediately <br />to reclaim mined out portions of the quarry. After the mine reaches the stage of de- <br />velopment requiring the removal of overburden (about 8-10 years), excess overburden <br />may be processed for its sand and gravel content. <br />Lightweight aggregate is a coated, hard-shelled aggregate that is produced by heating <br />mined sha]e in a rotary kiln. The resultant material when used as a concrete aggregate <br />provides the structural strength of sand and gravel aggregate, but with one-third less <br />weight. The plant operation will heat the shale, cool the subsequent aggregate and size <br />the material for shipment to clients. The manufacturing process is depicted schem- <br />atically in :Map No. 1. <br />The kiln pyroprocessing begins with the removal of sized ra~v shale from the storage <br />bins. It is conveyed to a 240-foot long, 12 foot diameter rotary kiln. The kiln is <br />fueled using low sulfur western coal pulverized to 200 mesh in size. The coal is ignited <br />-2- <br />Hydro-Se~~rch, ICIC. HYDROLOGISTS-GEOLOGISTS-ENGINEERS <br />