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10 <br />Table II. Dissolved Constituents in Waters of the Central <br />0 City Mining District. <br /> MINE EFFLUENTS SURFACE WATERS <br /> Central Intermediate Peripheral Neva a Virginia <br /> Zone Zone Zone Gulch Canyon <br />Si02 50-70 40-70 20-40 - 60-100 <br />Al 25-100 n.d. n.d. - 50-80 <br />Fe 200-700 2-170 0.5-4 0.5 2.4-36 <br />Mg 150-260 80-12.0 30-100 30 110-130 <br />Ca 240-360 140-300 40-300 55 170-210 <br />Mn 90-120 20-40 1.0-5.0 8 54-68 <br />Cu 6-60 0.1-5 <0.01-0.11 2.5 6.7-14 <br />Zn 60-400 7-100 0.3-8 40 60-90 <br />Cd 0.2-2.9 <0.01-0.3 <0.01-0.04 0.25 0.03-0.04 <br />• Pb 0.1-0.5 <0.01-0.20 <0.01-0.06 0.17 =0.10 <br />Na 10-23 14-27 6-25 8 14-23 <br />K 1.4-3.5 4.8-7.6 3.0-5.1 3 1.7-2.9 <br />As 0.2-7 <0.001 0.01 <0.001 <0.001 <0.003 <br />S04 2300-4000 900-1300 240-800 1000 =1600 <br />pH 2.1-2.7 4.0-6.0 5.4-6.9 3.7 2.6-3.3 <br />conda 3100-6500 1420-2100 400-1495 550 2300-3000 <br />conda - conductivity in umho/cm. <br />