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Mountain Conl Compnnr 2000 Annual Hydrology Reporf We.cr Elk Mine <br />Water is added during dust suppression spraying for the longwall and for the continuous miner <br />• operations. This water is approximately 1.5 percent by weight of the coal produced. With the <br />3.96 million tons of product and gob that left the mine workings in WY00, there were about 44 <br />acre-feet of water used. Due to the thermal event, the amount of product produced during WY00 <br />was significantly reduced. Other losses included added moisture to the ventilation air and <br />absorption into gob and floor materials. <br />The total volume of water leaving the mine during WY00 was 781 acre-feet, which is <br />approximately 90 acre-feet less than the volume of water that entered the mine during the same <br />period. The difference is likely due to in part to water contained in "dead" storage in the NE <br />Panels sealed sump and water chat was trapped and unable to drain from the NW Panels sealed <br />sump. <br />• <br />u <br />831-031.550 Page 21 Wright Water Engineecc <br />