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2721 Alumina Production This Class consists of units mainly engaged in refining bauxite to form alumina. Primary Activities 2722 Aluminium Smelting This Class consists of units mainly engaged in smelting alumina to produce aluminium, in the recovery of aluminium from scrap, or in alloying aluminium from primary aluminium smelted at the same units. Primary Activities 2723 Copper, Silver, Lead and Zinc Smelting, Refining This Class consists of units mainly engaged in primary smelting or refining of copper, silver, lead or zinc, or in the recovery of these metals from waste or scrap. This Class also includes by-production of sulphuric acid in conjunction with the smelting of these metals. Exclusions / References Primary Activities 2729 Basic Non-Ferrous Metal Manufacturing n.e.c. This Class consists of units mainly engaged in primary smelting, secondary smelting and refining of non-ferrous metals n.e.c., or in the recovery of such metals from drosses, ashes, scrap or other waste materials. This Class also includes units mainly engaged in manufacturing metal powders or flakes, of molybdenum, tantalum or tungsten (except from scrap). Exclusions / References
(b) manufacturing of metallic compounds n.e.c. not in association with smelting are included in Class 2535 Inorganic Industrial Chemical Mfg n.e.c.; and (c) manufacturing welding and foundry fluxes are in Class 2549 Chemical Product Manufacturing n.e.c. Antimony, refined, mfg; Bismuth smelting or refining; Bronze mfg; Can de-tinning; Gold refining; Molybdenum metal powders or flakes mfg; Nickel oxide production in association with nickel smelting; Nickel smelting or refining; Non-ferrous alloys mfg n.e.c.; Non-ferrous metals n.e.c. from waste materials recovering; Non-ferrous metals n.e.c. refining; Rare earth metals smelting; Silicon smelting; Solder mfg; Tantalum metal powders mfg; Tin smelting; Titanium smelting; Welding rods mfg
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