the tube mill contained a 730-1b charge of steel balls ranging from 3/4 to 1-1 / 8 in and was operated at of critical speed . was minus 2 in and was crushed dry to minus 10 mesh with a jaw crusher , cone crusher , and rolls . the minus 10 - mesh ore was stored in 55gal steel drums , and each drum was 75 pct table 2 .
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