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i <br />A S C I <br />1 <br />t <br />1 <br />1 <br />1 <br />EXECUTIVE SUMMARY <br />' An evaluation of water quality data from samples collected at the San Luis tailings <br />' facility on May 11, 1992 indicates that free cyanide analyses on the samples are <br />incorrect. Based on the metallo-cyanide chemistry of the tailings solution samples, <br />values for total cyanide, weak acid dissociable cyanide and free cyanide have been <br />' derived for the overall tailings system. These data indicate that the theoretical <br />maximum free cyanide level in the lower tailings pond is 32 mg/L and snore probably <br />about 20 mg/L, down from about 185 mg/L prior to detoxification df the tailings <br />' using the Cytox reagent. <br />1 <br />