This major group includes establishments primarily engaged in mining, developing mines, or exploring for metallic minerals (ores). These ores are valued chiefly for the metals contained, to be recovered for use as such or as constituents of alloys, chemicals, pigments or other products. This major group also includes all ore dressing and beneficiating operations, whether performed at mills operated in conjunction with the mines served or at mills, such as custom mills, operated separately. These include mills which crush, grind, wash, dry, sinter, calcine, or leach ore, or perform gravity separation or flotation operations. Magnesite and brucite operations are classified in Industry 1459, and crushed dolomite operations are classified in Industry 1422. Smelters and refineries are classified in Manufacturing, Major Group 33, and establishments engaged in producing primary magnesium metal are classified in Manufacturing, Industry 3339. The operation of brine wells or sea water plants for the production of magnesium is classified in Manufacturing, Major Group 28.

When performed by operators of the properties, exploration under preliminary phases of operation should be classified according to the type of ore expected to be found. Exploration performed on a contract or fee basis is classified in Industry 1081.
Industry Group 101: Iron Ores
·1011 Iron Ores
Industry Group 102: Copper Ores
·1021 Copper Ores
Industry Group 103: Lead And Zinc Ores
·1031 Lead and Zinc Ores
Industry Group 104: Gold And Silver Ores
·1041 Gold Ores
·1044 Silver Ores
Industry Group 106: Ferroalloy Ores, Except Vanadium
·1061 Ferroalloy Ores, Except Vanadium
Industry Group 108: Metal Mining Services
·1081 Metal Mining Services
Industry Group 109: Miscellaneous Metal Ores
·1094 Uranium-Radium-Vanadium Ores
·1099 Miscellaneous Metal Ores, Not Elsewhere Classified

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