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14 mesh 48 mesh 80 per cent acid alumina amount of manganese analysis basic pig iron basic slag bath Bessemer process blast furnace carbon steel cent alloys cent ferro cent iron cent manganese cent spiegel chert computed Concentrates containing Cost of mining crude cupola Cuyuna manganiferous iron Cuyuna Range deoxidizers deposits electric furnace ferro-alloys ferromanganese ganese grade heat high in manganese high manganese high phosphorus high-grade impurities inch increase Iron Age Iron and Steel Iron by weight iron ore bodies iron oxide iron-bearing Lake Superior lime Long Tons loss of manganese low phosphorus Lower Lake ports Magnesia manga manganese alloys manganese content manganese oxide manufacture material melting metallurgical Mn by weight moisture open-hearth process original pig iron present produced quantities of manganese recarburizer reducing atmosphere replacement roasted rocks screen silica silicon slag volume spiegeleisen sulphur Superior docks temperature tests tion tonnage tons Total United