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Sulfate <br />Sulfate concentration was low with concentrations of 68 mg/L after 5 minutes and 106 mg/L after <br />18 hours. <br />Selected Major-Element Trends <br />Jack Pine leachate had moderately low calcium concentration that ranged from 10.4 mg/L in the 5- <br />minute leach to 14.6. mg/L after 18 hours. <br />Selected Trace-Metal Trends <br />Following are summaries of selected trace-element trends portrayed in the time study (5-minute <br />vs. 18-hour) of the Jack Pine mine-waste leachate. <br />Aluminum (Al).-No aluminum was found in the leachate. Both the 5-minute and 18-hour <br />values were <2 µg/L. <br />Cadmium (Cd).-Elevated concentration of cadmium was found in the leachate with values of <br />160 µg/L after 5 minutes, increasing to 313 pg/L after 18 hours. <br />Copper (Cu).-Moderate leachate copper concentration was found and the concentration <br />decreased slightly over time. Values ranged from 20.6 pg/L in the 5-minute leachate to 15.2 <br />pg/L after 18 hours. <br />Iron (Fe).-No iron was found in the Jack Pine leachate at the ICP-MS detection limit. Both <br />the 5-minute and 18-hour leachates were <50 pg/L. <br />Manganese (Mn).-Elevated manganese was found in the Jack Pine leachate. The 5-minute <br />concentration was 2,280 µg/L, increasing to 3,560 pg/L after 18 hours. <br />Mercury (Hg).-Mercury was not detected in the Jack Pine leachate. <br />Nickel (Ni).-Nickel was found in the leachate with a 5-minute concentration of 2.4 µg/L, <br />increasing to 4.7 gg/L after 18 hours. <br />Lead (Pb).-High leachate concentration of leachate lead was found, and lead concentration <br />increased over time from 1,860 µg/L after 5 minutes to 2,000 µg/L after 18 hours. <br />Zinc (Zn).-Very high concentration of zinc was found in the Jack Pine leachate, and zinc <br />concentration increased over time. The 5-minute concentration was 19,000 pg/L; this value <br />increased to 37,700 µg/L after 18 hours. This is one of the highest concentrations of zinc <br />found in the 13 mine-waste sites included in this study. . <br />Superior Mine <br />The Superior mine is located in the Snake River drainage just below the confluence with Deer <br />Creek. The mine is hosted in the Swandyke hornblende gneiss. <br />Net-Acidity <br />5.0 kg CaCO,/ton. <br />pH Trend <br />There was an increase in pH over time in the Superior mine-waste leachate. pH rose from 5.0 after <br />5 minutes to 5.4 after 18 hours. (+0.4 pH units). This indicates net-acid neutralization of the leachate over <br />time. <br />Hageman_SIR_2508.doc 20 7/21/20042:50 PM