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1 <br />1 <br />TABLE 3 <br />MINE FLOODING <br />MINE SECTOR MINE AREA MINE VOLUME FILLING TIME - YEARS <br />(acres) (cubic ft.) NATURAL NATURAL <br />' INFLOW 6 ARTIF. <br />(33.5 gpm) (71.5 gpm) <br />' 1984 (Existing <br />mine) 660 57,499,200 24.4 11.4 <br />1965 142 12,407,500 5.3 2.5 <br />1986 130 11,318,125 4.8 2.3 <br />1987 108 9,425,000 4.0 1.9 <br />1988 234 20,352,500 8.6 4.1 <br />' 1989 141 12,262,500 5.2 2.4 <br />NORTH-EAST 361 31,425,000 13.4 6.3 <br />NORTH 328 28,594,000 12.1 5.7 <br />' NORTH-WEST 100 8,700,000 3.7 1.7 <br />WEST 891 77,580,000 33.0 15.4 <br />SOUTH-WEST 442 38,520,000 16.4 7.7 <br />TOTALS 3,537 308,083,825 130.9 61.4 <br />The presented time table of mine flooding should be <br />' considered approximate for the following reasons: <br />o preliminary mining plans for the time period <br />after 1989; <br />1 o mining methods and percentage of recovery can <br />change in the future; <br />' o volume of a flooded mine is not the same as <br />the volume of the extracted materials. <br />In the analysis of mine flooding we assumed an average <br />overall recovery of 20 percent. This includes the mined areas <br />with main entries, mains, submains, partial recovery and full <br />' recovery. The range of recovery can vary from 15 to 50 percent. <br />The experience with flooding and pumping out flooded coal mines <br />indicates that the volume of water in flooded mines is in a range <br />' of 0.5 to 0.8 of the total mined out volume (Kamenskij, et. al, <br />1957 and Rogoz, 1974). The lower number is typical for mines <br />using predominantly a long-wall method of mining with substantial <br />caving. In the Orchard Valley mine where overall recovery is <br />relatively low and caving is limited, the volume of mine flooding <br />will be close to the mined out volume. <br />The post-mining water quality is expected to be similar to <br />the quality of water entering the mine. The Farmer's mine <br />located east of the Orchard Valley mine was abandoned in 1953. <br />During the summer of 1983, CWI performed an investigation of the <br />12 in un~~.r.,:~~ r.~~~,i cn~i', <br />