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• 2.05.3 <br />structures, OSM and DMG approved storage of plans rather than submittal in this document. <br />The east portal bench level, elevation 7,170 feet, is used exclusively for labor, equipment and <br />material ingress and egress and for the conveyance of coal. Both portals were sealed after the <br />1986 mine fire but were re-opened to establish the North Mains by-pass in 1993. <br />A rock dust storage bin is also located at this level. The rock dust storage bin was relocated to <br />another associated mine in eazly 1998. Immediately below the rock dust bin is a tank building and <br />compressor house which contain a pressurized rock dust tank and a compressor. This system is <br />used to support the in-mine rock dusting program, as required by the Mine Safety and Health <br />Administration. A storage tank containing a magnesium chloride solution is located adjacent to <br />the main access portal. This solution is used for the treatment of underground roadways and <br />some surface roads. A change house (pre-engineered) metal building to provide sanitary shower <br />and change room facilities for mine workers is also located on the Portal Level. Office and <br />training space for mine Supervisory, Safety, and Engineering staff is located in the upper level of <br />the change-house facilities. An area for fuel, lubricants, and maintenance equipment is located on <br />this level as well. <br />The main electrical substation for the mine is located at an elevation of 7,140 feet. It reduces the <br />. incoming 46 KV power to usable power for underground and surface operations. <br />At 6,990 feet elevation, shop and warehouse buildings are of apre-engineered type. The <br />warehouse stores and disperses numerous small mine supply items. Major and minor repair and <br />maintenance work is performed in the shop areas. Across the road from this is apre-engineered <br />fire shop and ground storage complex used for storage of large mine machinery and storage of <br />supplies. <br />Description of Material Flow for Coal Storage. HandlinP, and Transportation Facilities. See <br />Maps 8-1 and 8-3 in Volume 8; and Diagrams, Figure 2.05-1, 2.05-2 in Volume 8A.) <br />On the mining sections, a continuous miner with amulti-tooth rotating head breaks the coal loose <br />from the solid mining face. Gathering arms on the front of the machine gather the broken coal <br />onto a chain conveyor for transport to adiesel-powered haulage truck (teletram) or electric <br />shuttle cars. The truck or shuttle car hauls the coal to afeeder-breaker which reduces it in size to <br />about 8-inch (minus), then transfers it onto a 36-inch belt conveyor leading to the main 48-inch <br />belt. Before the June 1, 1986, mine fire and after the North Mains by-pass was constructed in <br />1993 the 48-inch conveyor moved the coal from the mine workings at the rate of 1600 tons per <br />hour. The coal passed beneath a magnet that removed any steel that had inadvertently mixed into <br />the coal. The coal was conveyed to the surface on enclosed conveyor, C-0. The direction of the <br />conveyor structure was changed at Transfer Tower Number 1. A waste rock diversion chute <br />• constructed on Transfer Tower Number 1 during December, 1982, may be opened to divert gob <br />rock to a holding area on the north side of the tower. Coal flow continued after a flop gate was <br />1T2-32 - 21 - 9/99 <br />^~S/oo <br />