1988-06-17_REPORT - C1981012 (2)

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Figure 3 graphically displays this hydrograph for 1987. Average daily discharge ranged from 31, 014 gallons per day (gpd) during mid January to 262 , 000 gpd during December. Extremes in average daily discharge are usually explained by pump efficiency since flow measurements are based on pump hours . As indicated, a major flow increase was observed in December. This was a result of increased flow encountered during mine development activities during that period. When relating calculated discharge to the inflow results, correlation of inflow to discharge is relatively close. An inflow of 4 5. 4 gpm relates to 6 5, 376 gpd. Pump records are near this inflow for most of the months during 1987 (Table 3) . New Elk Mine At the New Elk Mine, thirteen sources identified in the 1983 mine inflow survey were examined. No additional sources were found other than those thirteen, of which three were dry. Table 4 presents the location, probable water source and estimated gallons per minute (gpm) for each of these sources. Major sources were measured volumetrically while seepage and weeping faces were estimated. A total of 123 gpm inflow was estimated. Of that amount, approximately 109 gpm is being generated from mined out areas totaling approximately 2, 800 acres (sources III, IV, V, VIII, IX, X, XI, XII and XIII ) . Representative water quality of the inflow was measured . Table 5 presents the temperature, conductivity and pH of each source. Quality of those sources seeping from gob or abandoned mine areas was higher in temperature and conductivity than those areas of current workings . Quality ranged from 1, 830 to 3, 540 umhos conductivity, 15.6 to 18 . 30C temperature and 6. 7 to 8. 0 S .U. pH. Quality of active areas ranged from 762 to 1045 umhos conductivity, 9.9 to 15. 30C temperature and 6.9 to 8. 0 S .U. pH.