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Section - 2.05.3 <br />to be routed to the East Yard coal stockpile stacking conveyor. In an emergency or if the conveyors <br />are down, trucks may be used to haul coal from the mines to stockpile. <br />Modifications to the surface coal and mine waste handling systems in conjunction with the mine <br />expansion initiated in 1995 included: <br />• Modification of the Sanborn Creek Mine overland conveyor to increase capacity to a <br />maximum of 4,800,000 tons per year <br />• Extension of the existing Elk Creek culvert to the north <br />• Grading of present Elk Creek coal stockpile area to extend it to the north, east, and west <br />• Clearing of the lower valley slopes to provide for dead coal storage <br />• Construction of two coal stacking tubes and a coal distribution system <br />• Installation of a sub -grade coal reclaim system from the stockpile area to the present dump <br />station <br />• Construction of a coal screening installation <br />• Modification of the existing crusher and associated transfer conveyors <br />• Modification of the existing' silo and discharge gates <br />• Construction of a new batch -weigh loadout and transfer conveyor <br />• Phased development of the West Valley'Fill coal refuse and mine development waste disposal <br />area <br />• Construction of the West Valley haul road <br />The coal stacking tubes are fed by a segment of overland conveyor (Conveyor 1A) running from the <br />existing Conveyor No. 2 drive station through a transfer station to the top of the first stacking tube. <br />The stacking tubes provide approximately 50,000 tons of live storage each, with an additional 200,000 <br />tons of dead storage available in the surrounding area by pushing coal away from the stacking tubes <br />with dozers. The resulting expanded Elk Creek coal stockpile, which has a maximum storage capacity <br />of approximately 300,000 tons of coal, replaced the former 60,000 ton capacity Elk Creek stockpile. <br />The transfer station on the Conveyor 1A segment provides the capability to discharge either mine <br />development waste or coal to the East Yard storage area for temporary stockpiling if other systems <br />are down. Similarly, the Elk Creek Mine overland conveyor will tie -in to the Stacking Tube No. 1 <br />headhouse. <br />Operation Descriution <br />Ongoing and anticipated future mining operations involve no surface mining activities. The <br />underground mining operations are described in general terms in Section 2.05.2 and in greater detail <br />in the preceding portions of this section. Areas affected by mining and related operations are shown <br />on the General Facilities Map, (Map 2.05 -M1), and the Mine Plan Map, (Map 2.05 — M2). <br />Mine Facilities <br />The location of existing and proposed mine structures and facilities within the Mine Permit Area are <br />shown on the Mine Facilities Map, (Map 2.05 -M1), facility details are shown on the Facilities Details <br />Map series, (Maps 2.05 -M3x), and their functions, uses, and maintenance section are described in <br />PR -07 2.05 -7b Revised May 2012 <br />