PERMFILE121073 - Laserfiche WebLink

Home Browse Search

the percent recovery of coal from the feed coal material, in order to better understand the functioning of the plant. This material was stockpiled at a site on the existing low quality coal stockpile. The material was tested to determine if the plant was producing the quality of washed coal projected in the design and to determine if the physical characteristics of the refuse material produced was consistent with the parameters used in designing the refuse pile. The material generated during this start up period was stockpiled in the location shown on Figure 7b, (Prep. Plant Material, Temporary Stockpile Location). Markers for easy recognition identified the material. The start-up period ran for approximately two to three weeks. During the initial first few days the plant was run for 10 hours per day. Given a feed rate of 200 to 250 tons per hour, approximately 700 to 875 tons per day, or 2,100 to 2,625 tons for this three-day period was generated. After the initial first few days, the plant was run 20 hours per day for atwo-week period. This resulted in an additional 19,600 to 24,500 tons, for this period. Therefore, a total of 21,700 tons of material could be produced. The quantity was dependent upon the functioning of the plant. This material was relocated to the permanent refuse pile by June 30, 1995. As of May, 1999, TCC had exhausted all of the previously stockpiled low-quality coal. It was originally planned to run the plant on a seasonal time-frame of April though October, unless conditions dictated it run yeaz-round. Tn order to accommodate this schedule, approximately 200,000 - 400,000 tons of material would have to be stockpiled near the existing grizzly. The location of the stockpile is shown on Map 24. With ongoing operations, it has been determined that yeaz-round operation of the Preparation Plant is beneficial, both minimizing stockpiled quantities of low-quality coal and providing a supplemental feed source for both stoker and clean coal. When the Preparation Plant and associated facilities are no longer needed the buildings and equipment will be demolished and removed and the foundations will be graded over, as part of the fmal reclamation for the mine. Based on the final topography, all foundation structures will be below the proposed final contours; therefore, no additional bond is required for the removal of the foundation materials. • Self-Cleaning Magnet tMR96-1411 A self-cleaning magnet was installed above the Preparation Plant feed belt immediately outside the plant reclaim tunnel. This magnet is required to prevent steel from being transported into the mechanical systems in the plant with the coal. The foundation is four 18-inch concrete caissons extending 14 feet below existing grade. The support structure is constructed of steel W8x31 beams and is 25 feet in height. Approximately 140 feet of steel beams was used in the support structure. Electrical service is provided via a conduit mounted on the feed belt truss and tied into the plant MCC room. Temaorarv Convevor from Rock Belt Discharge Pile to Low-Quality Coal Stockoile/Preaaration Plant A system of temporary conveyors including an underground feeder, conveyor structures and foundations, a radial stacker, and associated power and control components was proposed from the existing rock belt discharge pile, extending to the east end of the low-quality coal pile and the Prepamtion Plant. The system was never constructed, and there are no plans to construct the system in its originally proposed configuration. Temuorarv Convevor from the Low-Quality Coal Stockpile to the Preparation Plant A temporary conveyor with portable feeder was proposed from the low-quality coal pile to the Preparation Plant. The system was never constructed, and there are no plans to construct the system in its originally proposed configuration. r 1 U TR06-5;3~' 2.05-31 ~ 06/20/06