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Roll Forming Mill Shaft Design And Worked E Amples

Gold placers and placering in arizona arizona bureauofmines bulletin 168 1961.1865, these placers have been worked more or less erery year down to the present time, and all the known productive gravel.East, the operators sank a shaft tha,t struck bedrock at a depth of 84 feet, according to mr.Mcmillen,lo a small pay streak was.