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opf iron ore mining

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opf iron ore mining

Iron ores are rocks and minerals from which metallic iron can be economically extracted The ores are usually rich in iron oxides and vary in color from dark grey bright yellow or deep purple to rusty red The iron is usually found in the form of magnetite Fe 3O 4 724 Fe hematite Fe 2O 3 699 Fe goethite FeOOH 629 Fe limonite FeOOH·nH2O 55 Fe or siderite FeCO3 482 Fe Ores containing very high quantities of hematite or magnetite greater than about 60 iron are known

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