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expected to occur along the beach. Testing for the cyanide <br />• loss from the tailings has not been completed. The cyanide <br />quantity collected in the sodium hydroxide trap will be <br />compared to the quantity of cyanide left in the tailings. Both <br />of these values will then be compared to the initial quantity <br />of residual cyanide in the tailings to estimate the amount of <br />volatilization. The results of this testing program will be <br />submitted within two to three weeks to the MLRD for <br />incorporation in the document review process. <br />In addition to physical testing of tailings material, <br />an evaporation and consolidation study was performed using <br />laboratory derived characteristics of tailings material and <br />climatic data for the project. Results of the study are shown <br />on Table D.6-1. From the laboratory tailings tests the initial <br />deposited tailings void ratio and dry unit weight are estimated <br />at 1.42 and 10 PCF, respectively. For the analysis a maximum <br />desiccated density of 90 pcf was adopted. <br />• The results of the analysis indicate that following the <br />first year of operation, during which the higher rates of rise <br />are occurring, sufficient evaporative loss occurs to produce <br />the desiccated dry density of 90 pcf. <br />Deposition modeling test results are contained in <br />Appendix B. <br />D.6.4.4 Geochemical Characteristics <br />The geochemical testing program for the tailings consists <br />of the following test series: <br />1. Acidification/neutralization potentials; <br />2. Leachability; <br />3. Column tests; and <br />• 4. Humidity cell testing. <br />D-29 <br />