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Table 9 <br />Prediction of Golden Eagle Mine Discharge on Quality <br />of Water in the North Fork of the Purgatoire River <br />at Low Flow (4 cfs) and Mean Flow (20 cfs)' <br />Change in Concentration (mg/I) and Absolute Change in Value <br />Low Flow (4 cfs) Mean Flow (20 cfs) <br />Current Life of Mine PRS-3 11/932 Current Life of Mine <br />HCO3 119 199(+80) 234(+115) 170 136 (+17) 145 (+26) <br />Ca 38 35(-3) 33(-5) 44 37.3(-.7) 37(-1) <br />C1 1.4 3.21(+1.81) 4.0(+2.6) 3 1.8(+.4) 2(+.6) <br />F 0.3 0.84(+.54) 1.1(+.8) .3 0.4(+.1) 0.48(+.18) <br />Fe 0.44 0.67(+.23) 0.77(.33) .15 0.5(+.6) 0.52(+.08) <br />Mg 7.4 6.8(-.6) 6.6(-.8) 9 7.3 (-.1) 7.22(+.18) <br />Mn 0.012 0.02(+.008) 0.02(+.008) 9 0.01(-.002) 0.01(+.002) <br />K 1.4 1.53(+.13) 1.58(+.18) 1 1.43(+.03) 1.44(+.04) <br />Na 9.0 50(+.41) 69(+60) 9 18(+9) 22.6(+13.6) <br />SO, 36 35(-1) 34.5(-1.5) 27 35.8(-.2) 35.7(+.3) <br />TDS 166 382(+216) 479(+313) 210 213(+47) 237(+71) <br />' Assumes mine discharge =mine inflow at 0.463 cfs in 1993 and 0.707 cfs for the life of mine. Quality is based on <br />maximum levels observed in the Golden Eagle Mine dischazge, with the exception of chloride, for which the mean was <br />used. <br />Z Flow of 13.13 cfs. <br />• <br />L <br />