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the testing programs along with the test results are included <br /> in Appendices D, E, and F, respectively, of this report. <br />D.6.4.2 Physical Tests <br />Physical testing of the tailings consisted of gradation <br />tests and specific gravity tests. Atterberg limits tests were <br />not completed as the tailings were observed to be non-plastic. <br />The gradation tests indicate that the whole tail~~ngs material <br />classifies as a sandy silt or ML according to the Unified Soil <br />Classification System (USCS). The sand fraction composes <br />approximately 32 percent by weight of the sample with the <br />remainder being silt. Samples of the coarser and finer <br />materials were obtained from the sample barrel and tested to <br />evaluate the potential gradational variation in a water <br />deposition environment. The coarser samples were classified <br />as silt and sand (ML) with 38 to 45 percent sand. The finer <br />sample was classified as silt (ML) with zero percent sand. The <br />• specific gravity of the tailings was determined to be 2.72. <br />Test results are contained in Appendix D. <br />D.6.4.3 Deposition Modeling <br />The deposition modeling program consisted of column <br />tests, a tailings box study, and a consolidat ion test. The <br />purpose of the column and consolidation tests was to evaluate <br />the possible range of settled tailings densities and the rate <br />of consolidation. The purpose of the tailings box study was <br />to indicate beach angles, settled densities achieved in beach <br />deposition and subsequent desiccation and gradational variation <br />along the beach. In addition, a test program was developed for <br />the tailings box to attempt to determine the amount of <br />volatilization of cyanide which could be expected to occur <br />from a tailings beach. <br /> <br />D-27 <br />