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- 7- <br />n <br />u <br />at about 116 pcf. Determination of the actual bulking factor <br />is difficult because tests cannot be made in the lower portions of <br />the spoil piles. The only areas accessible are at the surface and <br />on the upper portions of existing loose spoil piles. Based on <br />the experience at the mine, and the results of these tests, we <br />believe the actual bulking factor will range from 26 to 30 percent <br />and for design purposes recommend a bulking factor of 28 percent. <br />Density tests made in the existing hail roads indicate that compac- <br />lion can be achieved from travel with the haul trucks. Earlier <br />in the summer, we investigated compaction of fill in an area where <br />spoil had been placed to support a fuel tank. Where a thick layer <br />had been placed subject to compaction by haul units, the average <br />• in-place density ranged from 88 to 93 percent standard Proctor <br />maximum dry density. The near-surface tests indicated compaction <br />above 100 percent for standard Proctor density. The Proctor density <br />for the materials checked at that point was 108 pcf dry. All <br />of this data has been used in our evaluation of the typical proper- <br />ties of the materials to be placed in the spoil piles. <br />Observed Angles of Repose <br />We have made numerous observations of the angle of repose for <br />various materials encountered at the existing mine. The properties <br />of the overburden rock were tested and reported to Energy Fuels <br />Corporation in a report designated "Preliminary Design of High <br />Wall Slopes", Kenneth C. Ko and Associates, dated March 1977. <br />• <br />