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9.2 Composite Assistant metallurgist Bureau of Mines Combined nonmagnetic concentrates Combined tailings Composite Float Composite Roasted heads concentrates from table concentrates Magnetic portion dlings and slimes Fe SiO Ferrograde ferromanganese-grade concentrates Float-and-sink flotation concentrates Flotation table mid Flotation tests given in table high-grade hydrogen iron and manganese iron minerals Ironton jig concentrates magnetic concentrates Magnetic portion Nonmagnetic Magnetic separation tests manganese and iron MANGANESE INVESTIGATIONS manganese minerals manganese was recovered manganiferous iron concentrates Metallurgical Division minerals are intimately Mn Fe Si02 oleic acid Ore-Dressing Section percent Assay percent iron percent manganese percent Mn Percent of total percent Percent percent phosphorus percent silica portion Nonmagnetic portion product meeting Product Mn Fe reagents Report of Investigations Roasted concentrates Roasted heads 100.0 Roasting and magnetic Rolla Si09 P Mn specifications for Low-Grade table 14 table and flotation table concentrates table rejects gave tests are given tests on roasted total manganese total Product Mn Unroasted