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<br />Acid production potential to acid neutralization potential ratios (APP :ANP) range from a high <br />of 190:8.8 to 16.5:57.7, or approximately 22 : 1 to 0.3:1. Two of the ten samples have net <br />negative AGP, and only one of the 10 has and ANP :AGP ratio greater than 3, which is the <br />Division's recommended safe level. <br />Based on samples from the Jones, 1994, report, the Pink Gneiss unit appears to be a net <br />generator of acid. <br />B. Metals leachability - XRF and Batch Geach. <br />(From 1994 SRK report; 2 samples}. <br />Detection limits for selenium are higher than the regulated values in both samples. <br />(From Logsdon, 26 Sep 1995; 6 samples.) <br />Samples were crushed and mixed with site groundwater for sequential batch testing using a <br />water :rock ratio ranging from 1 : 4 to 4 : 1. Only one of the 6 samples had an ANP/AGP ratio <br />considered in the safe range; 3 of the 6 samples had net acid generating potential. Samples tested for <br />SO,. As, Cd, Cu, Fe and Zn met water quality standazds for drinking water and agricultural uses. All <br />pH values were 8.2 or higher. <br />Mn concentrations exceeded drinking water and agriculture standards. However, the local <br />groundwater, which was used for the leaching experiments, also exceeds agriculture and drinking <br />water standards, and our experience dictates that similar exceedances are common for the region. <br />For these samples, the groundwater-leach pH was 8.2, and the pH of the leach tests exceeded <br />8.2 in all cases. <br />C. Humidity Cell Tests. <br />(From 1994 SItK report; 2 samples). <br />Selenium exceeds drinking water and agriculture standards in both samples. <br />(From Logsdon, 1 February 1996; 3 composite samples.) <br />One of the three samples produced a consistently low pH throughout the 28 week test period; <br />acidity was still being produced after 28 weeks, though measurable sulfate generation ceased after 19 <br />weeks. In the other two samples, pH began to fall after about 22 weeks, though it had not reached <br />the reagent pH by the end of the 28 week test. <br />Biotite Gneiss <br />A. Acid Base Accounting <br />(From 1994 SRK report; 2 samples). <br />6 <br />