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0.04 percent phosphorus 10-mesh jig 14.7 percent manganese 2.9 percent 2.9 percent silica 2.95 Composite Heads 4.5 percent silica 4.8 percent iron 49.3 percent manganese assaying 49.3 percent barium oxide Bureau of Mines calcite concentrates centrates coke and water Composite Heads Float concentrates assaying concentrates were mixed crushed through 3/8-inch ferrograde product ferromanganese-grade Frother B-23 ganese gravity concentration Harz jig increase the manganese Little Florida Mountains locked test long tons lost in sinter Luna County manganese concentrates Manganese Valley Metallurgical Division Metallurgist middlings and slimes Minus-4 Mn Fe Si02 Ore-Dressing Section Ore-dressing tests percent alumina percent coke phosphorus and containing plus-4-mesh jig pound silicate pound sodium oleate pounds of tailings pounds of volatile pounds oleic acid pounds soda ash Report of Investigations Rolla sample of low-grade second method silica and containing Sink Sink-and-float Tests sintered concentrates spigot product table middlings tailings assaying total manganese volatile matter lost water and sintered