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STIPULATION NO. 13, NEW ELK MINE, STIPULATION NO. 11, GOLDEN EAGLE MINE <br /> MINE INFLOW STUDY <br /> On September 9, 1985 a mine inflow study was conducted to determine the quantity <br /> and quality of water flowing into the mine. Areas which were examined included all <br /> active and inactive underground mine workings. Figures 1 and 2 presents the mapping <br /> results of each point source inflow (faults, fractured roof, fractured floor, exploration <br /> drill hole, etc.) and each area wide inflow (drainage from seals to abandoned mine <br /> workings; areas of weeping coal faces, roof, or floors; unsealed mined areas; etc.) that <br /> were encountered during the survey. <br /> Golden Eagle Mine <br /> At the Golden Eagle Mine, eight sources identified in the 1983 mine inflow survey <br /> were examined. Ten additional sources were found as a result of new mining activities <br /> conducted in 1985. Table 1 presents the location, probable water source and estimated <br /> gallons per minute (gpm) for each of these sources. Major sources were measured <br /> volumetrically while seepage and weeping faces were estimated. A total of 26.4 gpm <br /> inflow was estimated. This relates to 30 gpm measured during the 1983 survey. <br /> Approximately 12.4 gpm is from the air shafts and a drill hole (sources II, VI and VIII) <br /> while the remainder is from seepage originating in the coal seam. <br /> Water quality of the inflow was also measured during the survey. Table 2 presents <br /> the temperature, conductivity and pH of each source. Quality ranged from 13.0 to 21.1 <br /> oC temperature, 935 to 1468 umhos conductivity, and 7.5 to 8.2 S.U. pH. <br /> Mine water inflow was collected in a sump and discharged from the mine by <br /> pumping. Table 3 presents average daily discharge from the mines (calculated from pump <br /> records over each seven day period). Figure 3 graphically displays this hydrograph for <br /> 1985. Average daily discharge ranged from 64,500 gallons per day (gpd) during mid <br /> December to 228,400 gpd during late March. Extremes in average daily discharge are <br /> usually explained by pump inefficiency since flow measurements are based on pump hours. <br />