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Zinc (Zn).-Zinc was found in the Lower Radical leachate, and zinc concentrations rose over <br />time. 5-minute concentration was 93 µg/L; this value rose to 310 after 18 hours. <br />Lower Chatauqua Mine <br />The Lower Chatauqua mine is located in the Deer Creek drainage in the Snake River watershed. <br />The mine is hosted in the Swandyke hornblende gneiss and schist with galena in branching veins or <br />breccias cemented by Manganese-rich ankerite and quartz. <br />Net-Acidity <br />3.0 kg CaCO,/ton. <br />pH Trend <br />There was an increase in pH over time in the Lower Chatauqua mine-waste leachate. pH rose from <br />5.0 after 5 minutes to 5.4 after 18 hours. (+0.4 pH units). This indicates net-acid neutralization of the <br />leachate over time. <br />Specific Conductance Trend <br />Leachate from the Lower Chatauqua mine-waste had low specific conductance with measurements <br />of 65 µS/cm after 5 minutes, rising to 147 pS/cm after 18 hours. <br />Sulfate <br />Sulfate concentrations were low and rose over time from 23 mg/L after 5 minutes to 57 mg/L after <br />18 hours. <br />Selected Major-Element Trends <br />Lower Chatauqua leachate had calcium that ranged from 5.3 mg/L in the 5-minute leach to 15 <br />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 Lower Chatauqua mine-waste leachates. <br />Aluminum (Al). Lower Chatauqua leachate had minor aluminum concentration. The <br />aluminum concentration went down over time. Concentration ranged from 17 µg/L in the 5- <br />minute leachate and decreased to 73 µg/L after 18 hours. <br />Cadmium (Cd).-Minor concentration of cadmium was found with concentrations of 2.9 µg/L <br />after 5 minutes, rising to 8.3 µg/L after 18 hours. - <br />Copper (Cu).-Minor leachate copper concentration was found, and concentration went down <br />over time. Values ranged from 12 µg/L in the 5-minute leachate to 5 µg/l, after 18 hours. <br />Iron (Fe).-Iron was not detected at instrument detection limits. Both 5-minute and 18-hour <br />leachates had iron concentrations of <1 µg/L. <br />Manganese (Mu).-Moderately high concentration of manganese was found in the leachate. <br />The 5-minute concentration was 1,700 µg/L and increased to 4,500 µg/L after 18 hours. <br />Mercury (Hg).-Mercury was not detected in the Lower Chatauqua mine-waste leachate. <br />Hageman_SIR_2508.doc 14 7/21/20042:50 PM