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10-mesh fraction 11 percent silica 35 percent Mn 8.8 percent Mn assay plus 35 base-price marketing 48.0 Boulder City Boulder Dam cationic flotation Chemical analysis Assay CLARK COUNTY Combined flotation manganese concentrate that assayed concentration of manganese crushed through 10-mesh crushed to minus data Product Weight deslimed differential crushing distribution of manganese Eiver flotation of silica gangue given in table gravity and silica gravity methods gave gypsum high-grade manganese concentrates investigated M.R.C. base-price marketing M.R.C. minimum marketing Magnetic separation manga manganese grade manganese oxides manganese products manganese was obtained manganese was recovered mesh Metallurgical data Weight Metals Reserve Company Methods of Concentration minimum marketing specifications minus 80-mesh material Mn when sintered nese percent manganese percent Mn Distribution percent Mn Product portion Reserve Company specifications Salt Lake City screen-sized silica from sized sintering Assay sized fractions slime stage-ground to minus tailing total manganese VIRGIN RIVER MANGANESE Virgin River sample