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Lower Radical Mine <br />The Lower Radical mine is located in the Deer Creek drainage in the Snake River watershed. The <br />mine is hosted in the Swandyke hornblende gneiss. <br />Net-Acidity <br />32 kg CaCO,/ton. <br />pH Trend <br />There was a slight decrease in pH overtime in the Lower Radical mine-waste leachate. pH <br />dropped from 4.8 after 5 minutes to 4.6 after 18 hours. (4.2 pH units). This indicates slight net-acid <br />production in the leachate over time. <br />Specific Conductance Trend <br />Leachate from the Lower Radical mine-waste had low specific conductance with measurements of <br />18 µS/cm after 5 minutes, rising to 45 µS/cm after 18 hours. <br />Sulfate <br />Lower Radical leachate sulfate concentrations were low and rose over time from 2.0 mg/L after 5 <br />minutes to 11 mg/L after 18 hours. <br />Selected Major-Element Trends <br />Lower Radical leachate had minor concentration of calcium, ranging from 0.4 mg/L in the 5- <br />minute leach to 1.5 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 Radical mine-waste leachate. <br />Aluminum (AI).-Lower Radical leachate had low concentrations of aluminum, and the <br />concentration remained almost constant over time. Concentration ranged from 23 pg/L in the <br />5-minute leachate to 24 pg/L after 18 hours. <br />Cadmium (Cd).-Minor concentrations of cadmium were found. Values ranged from 0.58 <br />pg/L after 5 minutes, rising to 2.2 pg/L after 18 hours. <br />Copper (Cu).-Lower Radical leachate copper concentrations were minor. Values were 7 <br />pg/L in the 5-minute leachate and 16 pg/L after 18 hours. <br />Iron (Fe).-Lower Radical leachate iron concentrations were low and dropped over time from <br />5.2 µg/L in the 5-minute leachate <1 µg/L after 18 hours. <br />Manganese (Mn). Manganese was found in the leachate from the Lower Radical mine- <br />waste. The 5-minute concentration was 260 µg/L and rose to 930 after 18 hours. <br />Mercury (Hg).-Mercury was not detected in the Lower Radical leachate. <br />Nickel (Ni).-Minor concentrations of nickel were found in the leachate with a slight increase <br />in leachate concentration over time. The 5-minute concentration was 1.1 µg/L; this value rose <br />to 2.6 µg/L after 18 hours. <br />Lead (Pb).-There was elevated lead in the leachate and concentration increased over time <br />from 390 µg/L after 5 minutes to 2,600 µg/L after 18 hours. <br />Hageman_SIR_2508.doc 13 7/21/20042:50 PM