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Specific Conductance Trend <br />Superior leachate had low specific conductance with measurements of 33.9 µS/cm after 5 minutes, <br />rising to 61.8 µ&cm after 18 hours. <br />Sulfate <br />Sulfate concentration was low in the leachate with concentrations of 13 mg/L after 5 minutes and <br />21 mg/L after 18 hours. <br />Selected Major-Element Trends <br />Superior leachate had low calcium concentration that ranged from 2.02 mg/L in the 5-minute leach <br />to 4.31 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 Superior mine-waste leachate. <br />Aluminum (Al).-This leachate had aluminum concentration that ranged from 18 pg/L in the <br />5-minute leachate and decreased to 8.4 µg/L after 18 hours. <br />Cadmium (Cd).-Minor concentration of cadmium was found in the Superior mine-waste <br />leachate with values of 0.7 µg/L after 5 minutes, rising to 1.69 µg/L after 18 hours. <br />Copper (Cu).-Minor leachate copper concentration was found and the concentration <br />decreased slightly over time. Values ranged from 0.24 µg/L in the 5-minute leachate to 0.22 <br />µg/L after 18 hours. <br />Iron (Fe).-Iron was found in low concentration in the leachate, and concentration decreased <br />over time from 3.3 pg/L in the 5-minute to 1.7 µg/L after 18 hours. <br />Manganese (Mn).-Moderate concentration of manganese was found in the Superior leachate. <br />The 5-minute concentration was 520 µg/L and increased to 1,380 pg/L after 18 hours. <br />Mercury (Hg).-Mercury was not detected in the Superior leachate. <br />Nickel (Ni).-Nickel was found in the leachate, with a 5-minute concentration of 1.8 µg/L, <br />increasing to 4.2 µg/L after 18 hours. <br />Lead (Pb).-Low leachate lead concentration was found and concentration decreased over <br />time from 1.6 µg/L after 5 minutes to 1.0 µg/L after 18 hours. <br />Zinc (Zn).-Moderate concentration of zinc was found in the Superior leachate, and zinc <br />concentration increased over time. The 5-minute concentration was 180 µg/L, increasing to <br />387 µg/L after 18 hours. <br />Wild Irishman Mine <br />The Wild Irishman mine is located in the Upper Saints John Creek drainage basin. Saints John <br />Creek flows into the Snake River below the confluence of Deer Creek and the Snake River. Host rock for <br />this mine is Swandyke hornblende gneiss and ore on dump from lower adit indicates veins consisted largely <br />of "manganosiderite" with moderate amounts of galena. On dump above lower adit, manganosiderite is rare <br />and quartz is the dominant gangue mineral. The mine is hosted in the Swandyke hornblende gneiss. <br />Net-Acidity <br />6.5 kg CaCO,/ton. <br />Hageman_SIR_2508.doc 21 7/21/20042:50 PM