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Y- ~• ~ <br />Memo to Berhan Reffelew <br />Carlton Tailings Lift Thickness - Supplemental <br />page 3 <br />Tailings structure to be stable. The assumed friction angles of as <br />low as 10° along with zero cohesion are equivalent to placement of <br />the material with minimum density. The required densities are <br />achievable with thick end-dumped placement. CC&VG and Golder <br />Associates did not pursue further investigation of compaction <br />relationships. Rather they opted to demonstrate that stability of <br />the structure did not require a specific compaction effort. <br />Therefore, I recommend approval of CC&VG's revision application. <br />cc: Bruce Humphries <br />Jim Stevens <br />Jim Dillie <br />Al Sorenson <br />Doc: M:\MIN\CRESSON\CARLFILL.STB <br />JP/7P <br />