Metal ore refers to metal-containing ore classified by metal type, grade and equivalent metal ore: (1) The same by metal type: ferrous metal ore such as iron, manganese and chromium; Nonferrous metal ores, such as copper, lead, zinc, aluminum, tin, molybdenum, nickel, antimony and tungsten; Precious metal ores, such as gold, silver and platinum; Rare metal minerals such as niobium, tantalum, beryllium and other single metal minerals contain two kinds of metal minerals. Second, according to metal grade: poor ore and rich magnetite: open hearth rich ore with iron grade > 55%; The iron-rich grade of blast furnace is more than 50%; Lean ore with iron grade of 30% ~ 50% can only be smelted after beneficiation. Third, according to chemical composition: gold, silver, platinum, copper, etc. Store in the form of single metal element in metal ore; Oxidized ore refers to mineralized oxide and carbonate sulfate minerals, such as magnetite (Fe2O4), jarosite (Fe2O3), galena (PbCO3) and pyrolusite (MnO2). Sulfide ore refers to the mineralized chalcopyrite (CuFeS2), lead ore (PbS), sphalerite (ZnS), molybdenite (MoS2), etc. Mixed ore means that the ore contains two mixtures of the first three minerals.