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2.05.3 <br />closed over the chute. The exiting conveyor, C-1 A, emptied into the top of a 2,000-ton surge bin <br />(elevation 7050 feet) which is capable of handling expected peaks in mine production and equaliz- <br />ing flow into the crushing and screening building. <br />All transfer points within the surface facilities are designed to control dust potential in accordance <br />with Section 2.05.6(1). Coal emptying from conveyor C-1, goes through a grizzly where 8-inch <br />(plus) particles are diverted by an enclosed chute to the rotary breaker. All 8-inch (minus) <br />material passes through a double deck screen. The first screen sizes the material to 4-inch <br />(minus), the second to 2-inch (minus). All materials 2-inch (minus) that traversed the screening <br />plant are transferred via enclosed chute to an enclosed 36-inch conveyor C-3. All oversized <br />particles aze diverted into the rotary breaker which separates out rock and breaks the coal by <br />rotation and fall methods. Material 3-inch (minus) leaving the rotary breaker is transferred via an <br />enclosed chute to 36-inch conveyor C-2. When the flop gate is opened, conveyor C-2 empties <br />into another enclosed diversion chute and into a 70-ton holding bin. Trucks are loaded with 3- <br />inch minus material from this bin, similar to the manner in which trucks aze loaded from the 250- <br />ton bins. When the flop gate is closed, conveyor C-2 empties the coal into a double roll crusher <br />which reduces it to 2-inch (minus). <br />At the crushing and screening facility (elevation 6950 feet) where the double roll crusher is <br />• located, screened 2-inch (minus) material and crushed 2-inch (minus) material aze rejoined onto <br />enclosed conveyor C-4 and deposited into a 250-ton surge bin. This crushed and screened <br />material is loaded into 28-ton capacity trucks. If the 250-ton capacity of the bin is exceeded, <br />overflow will automatically be transferred to conveyor C-5 and through a 4-foot diameter stacker <br />tube to be stockpiled by a front-end loader for future haulage. <br />Trucks loaded from the bin or by a front-end loader transport coal to the storage and load-out <br />area. The trucks dump their loads into two 25-ton bins within an enclosed truck dump. They <br />proceed around an access loop and return to the mine for additional coal. The dumped coal <br />empties from the bins onto an enclosed 42-inch conveyor, R-l. The coal is stored in one of three <br />silos, any of which may be filled or used alone or in combination through the use of conveyors R- <br />1, R-2, or R-3. Each silo is 70 feet in diameter and 110 feet high, and has a 7000 ton capacity. <br />A 10,000-ton, 100-car unit train is loaded via reciprocating feeders located below the silos. The <br />feeders load onto a 72-inch enclosed conveyor, R-4 where coal is weighed on a belt scale on its <br />way to the train loading building. Conveyor R-4 empties into a 250-ton surge bin for flood <br />loading of each railroad car. A chute is raised and lowered inside the car to maintain desired <br />loading height and to control dust. A portion of the coal within the bin is crushed and bagged for <br />chemical analysis. After a rail car is loaded, the top may be sprayed (depending on customer <br />requirements) with a latex based crusting agent to control dust emissions on the trip to the user. <br />(See Section 2.05.6(1) for further information on the application of this outing agent.) Agai, all <br />~al transfer points have dust control equipment in accordance with 2.05.6-(1). <br />TR-32 <br />_22_ <br />9/99 <br />2/S/oo <br />