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A maximum of approximately 130,000 tons were stored at the D Portal Area. The temporary coal <br />. storage has been reclaimed by front-end loaders and cohveyed to the breaker by truck and/or temporary <br />conveyors where it entered the normal processing stream. <br />IV.C.S Preparation Plant The coal preparation plant is designed as a closed water circuit. A fine coal <br />froth floatation circuit was added in early 1993 to increase recovery of fine coal and decrease the <br />amount of refuse to be disposed. A thickener is incorporated into the circuit far removal of fine solids <br />from the process water. Thickener underflow is further dewatered via filters. Depending upon the coal <br />contents, this fine refuse is either combined with the coarse refuse for disposal or added to the clean <br />coal circuit. The preparation plant building size is approximately 50 feet by 80 feet by 100 feet high. The <br />thickener tank is 150 feet in diameter and 12 feet high. <br />An emergency overflow pond is used to handle unscheduled overflows. Washdown water from the <br />preparation plant and from the silos is collected and pumped to this pond. The emergency overflow <br />pond is shown as PP-1 on Map 15 and 26. <br />Upon the cessation of mine operations, the breaker, preparation plant, thickener tank, sampling building, <br />and machinery at the silos will be dismantled and removed. The silos will be demolished and the debris <br />removed. Foundations will be covered. Afterwards, the areas will be regraded and revegetated <br />according to the procedures outlined in Section V, Reclamation Plan. <br />• IV.C.S.a Preparation Plant Bypass System <br />A system to bypass washing of coal in the preparation plant was installed in the fall of 1995. This <br />system is installed between the existing silos and the sampling building. This system will bypass some <br />or all of the run-of--mine coal depending on the quality of coal being mined. The coal to be bypassed is <br />transferred from the bottom of the existing silos by a belt conveyor to a transfer building, then to a <br />crusher building by a second belt conveyor where it is crushed to 2"x0" and then transferred by another <br />belt conveyor to the existing sampling building. <br />IV.C.6 Samalina and Surge Hopper Building Washed coal from the preparation plant is transported <br />by Conveyor BC-108 to the sampling building. Here the washed coal is sampled in order to monitor the <br />operation of the preparation plant. <br />The sampling and surge building is approximately 36 feet by 20 feet by 90 feet high. It is supported on <br />conventional spread footings. <br />A 150-ton surge hopper is located in the same structure as the sampling system to provide smoother <br />operation of the conveyor system transporting coal to the train loadout-storage area. <br />Mine Permit Renewal #3 (Rev. 8/99) IV-9 <br />