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BMRI -San Luis Pit Backfill.• Sequential Batch Tests of Cneiss <br />5. None of the chemistries observed across these leach tests -even at the lowest water <br />rock ratios, which would be observed only within the interstices of the waste rock <br />- would adversely affect the beneficial uses of ground water near the San Luis <br />Project. <br />Under fully saturated conditions, such as will be re-established in the backfilled West <br />Pit, the Pink Gneiss is not acid generating, does not leach significant concentrations of <br />any metal save manganese (and that only at a maximum of about 1 ppm), and is not <br />expected to adversely affect any beneficial use of ground water or surface water near <br />the Project. <br />The sequential batch tests of pink gneiss samples support the decision to backfill and <br />then re-saturate the West Pit. <br />Geochimica, Inc. 7 95911/1fi-Sep_95 <br />