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Cadmium (Cd).-Low concentrations of cadmium were found, with concentrations of 6.5 <br />µg/L after 5 minutes, rising to 14 µg/L after 18 hours. <br />Copper (Cu).-Copper concentration was moderately high and decreased over time from 740 <br />µg/L in the 5-minute leachate to 640 pg/L after 18 hours. <br />Iron (Fe).-No iron was found at instrument detection limits in the leachate from the Cashier <br />mine-waste. Both the 5-minute and 18-hour leachate concentration were <1 µg/L. <br />Manganese (Mn).-Very high concentration of manganese was found. Manganese values <br />ranged from 12,000 µg/L in the 5-minute leachate to 19,000 after 18 hours. <br />Mercury (Hg).-Mercury was not detected in the Cashier leachate. <br />Nickel (Ni).-Minor concentrations of nickel were found in the leachate with an increase in <br />leachate concentration over time. The 5-minute concentration was 11 µg/L, rising to 18 µg/L <br />after 18 hours. <br />Lead (Ph).-Leachate lead concentration was elevated and did not change over time staying <br />at 1,200 µg/L in both the 5-minute and 18-hour tests. <br />Zinc (Zn).-High concentrations of zinc were found in the Cashier leachate and the <br />concentration rose over time. The 5-minute zinc concentration was 1,100 µg/L; this value rose <br />to 2,200 pg/L after 18 hours. <br />Togo Mine <br />The Togo mine is located in the upper reach of the Snake River prior to confluence with Deer <br />Creek. The mine is hosted in the Idaho Springs formation. <br />Net-Acidity <br />83 kg CaCOj/ton. <br />pH Trend <br />There was a slight decrease in pH over time in the Togo mine-waste leachate. pH went down from <br />3.0 after 5 minutes to 2.9 after 18 hours. (-0.1 pH units). This indicates net-acid production the leachate <br />over time. <br />Specific Conductance Trend <br />Leachate from the Togo mine-waste had moderate conductance with measurements of 556 µS/cm <br />after 5 minutes, rising to 718 µS/cm after 18 hours. <br />Sulfate <br />Togo leachate sulfate concentration went up over time from 124 mg/L after 5 minutes to 139 mg/L <br />after 18 hours. <br />Selected Major-Element Trends <br />Togo leachate had minor concentration of calcium that ranged from 0.9 mg/L in the 5-minute <br />leach to 1.1 mg/L after 18 hours. <br />Hageman_SIR_2508.doc 17 7/21/20042:50 PM