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<br /> <br />Memo - Mike Long - n - April 24, ~::' <br />d. Item 8. <br />With the Humidity Cell Tests and Acid Generation/Acid Neu ralization <br />tests, BMG needs to determine the metals production poten ial of the now <br />Cu-rich tailings. These tests should also determine how table/unstable <br />the (ZnFe>CN complexes really are and, if unstable, just ~ow much cyanide <br />will be released and over what periods. <br />GENERAL CONCLUSIONS <br />1. For the moment, we do not know whether the monitor well syste is adequate to <br /> detect a leak to the environment from the tailings or collecti on ponds. <br />Z. We are not certain that the ponds are below the MLRD-mandated '40 ppm free <br /> cyanide because of disagreement between BMG labs and commercia{ labs. <br />3. Based on the CyTox literature, we do not have adequate scienti is or <br /> engineering information to know with certainty that the CyTox ystem will <br /> work, or that it has ever been successfully applied. <br />4. Under current practice, the CyTox process will apparently leav Cu-bearing and <br /> ~ <br />Cyanide-bearing tailings. The CyTox manufacturers have repres nted that their <br /> product will form stable metal cyanate precipitates, but their claims are not <br /> supported. Meanwhile, no one has said that the copper will be 'immobilized, <br /> and progress toward solving the copper problem seems nil. <br />5. Some of the analytical tests are probably redundant or otherwi~ e unnecessary. <br /> However, BMG'S proposal to analyze only free cyanide and coppe fall short of <br /> an adequate analytical program. <br />6. We currently have no way of detecting a leak from the tailings ponds except in <br />the M-9 Monitor Well. <br />HHP/ern <br />cc: B. Humphries <br />B. Keffelew <br />L. Oehler <br />J. Pendleton <br />A. Sorenson <br />9975E <br />