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that the ultimate settled height of the tailings would be <br />• approximately 2 inch per lift and the total accumulated <br />tailings was contained in the column. Since drained tailings <br />liquor was allowed to accumulate at the top of the tailings, <br />placement of the second and third lifts was accomplished <br />underwater. <br />Values of density and saturated moisture content were <br />calculated for each of the lifts deposited into the column as <br />well as for the total deposit. For the column with single <br />drainage (top) the calculated values attained ar•e as follows: <br />Lift No. Lift Saturated Total Saturated <br />Density Moisture Density Moisture <br /> Content Content <br />(PCF) (Y.) (PCF) (%) <br />1 76.2 45.2 -- -- <br />2 74.9 46.6 75.5 45.9 <br />3 73.5 48.1 74.9 46.6 <br />• 1.1.2 Bottom Drainage Column <br />As in the previous column the quantity of tailings placed <br />in the column was calculated to produce lifts of uniform <br />thickness. The tailings were placed in the column and drainage <br />was allowed to occur in both directions (top and bottom). <br />Subsequently the second and third lifts were placed on top of <br />drained tailings solids. <br />The calculated values of density and saturated moisture <br />content attained are as follows: <br /> <br />