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Alumina Limited, through its 40% interest in Alcoa World Alumina and Chemicals, engages in bauxite mining, alumina refining, and aluminum smelting businesses. It operates bauxite mines and alumina refineries in Australia, Guinea, Brazil, Spain, and Saudi Arabia; and holds a 55% interest in the Portland aluminum smelter in Victoria, Australia. The company was formerly known as WMC Limited and changed its name to Alumina Limited in December 2002. Alumina Limited was incorporated in 1970 and is headquartered in Southbank, Australia.

Ferroglobe PLC operates in the silicon and specialty metals industry in the United States, Europe, and internationally. It provides silicone chemicals that are used in a range of applications, including personal care items, construction-related products, health care products, and electronics, as well as silicon metal for primary and secondary aluminum producers; silicomanganese, which is used as deoxidizing agent in the steel manufacturing process; and ferromanganese that is used as a deoxidizing, desulphurizing, and degassing agent in the removal of nitrogen and other harmful elements from steel. The company also offers ferrosilicon products that are used to produce stainless steel, carbon steel, and various other steel alloys, as well as to manufacture electrodes and aluminum; calcium silicon, which is used in the deoxidation and desulfurization of liquid steel, and production of coatings for cast iron pipes, as well as in the welding process of powder metal and in pyrotechnics; and nodularizers and inoculants, which are used in the production of iron. In addition, it provides silica fume, a by-product of the electrometallurgical process of silicon metal and ferrosilicon. Further, the company operates quartz mines in South Africa, Spain, the United States, and Canada; and low-ash metallurgical coal mines in the United States, as well as holds interests in hydroelectric power plant in France. It serves silicone chemical, aluminum, and steel manufacturers; auto companies and their suppliers; ductile iron foundries; manufacturers of photovoltaic solar cells and computer chips; and concrete producers. The company was formerly known as VeloNewco Limited and changed its name to Ferroglobe PLC in December 2015. The company was incorporated in 2015 and is headquartered in London, the United Kingdom.

KAZ Minerals Plc engages in mining and producing of copper. It focuses on the development of new copper mining projects. It operates through following segments: Bozshakol, Aktogay, East Region and Bozymchak and Corporate Services. The company was founded in 1930 and is headquartered in London, the United Kingdom.

United States Antimony Corporation produces and sells antimony, silver, gold, and zeolite products in the United States, Mexico, and Canada. The company operates through Antimony, Zeolite, and Precious Metals segments. The company offers antimony oxide that is primarily used in conjunction with a halogen to form a synergistic flame retardant system for plastics, rubber, fiberglass, textile goods, paints, coatings, and paper. Its antimony oxide is also used as a color fastener in paints; as a catalyst for the production of polyester resins for fibers and films; as a catalyst for the production of polyethylene phthalate in plastic bottles; as a phosphorescent agent in fluorescent light bulbs; and as an opacifier for porcelains. In addition, the company offers sodium antimonite; and antimony metal for use in bearings, storage batteries, and ordnance; and precious metals. Further, it provides zeolite deposits for soil amendment and fertilizer, water filtration, sewage treatment, nuclear waste and other environmental cleanup, odor control, gas separation, and animal nutrition applications. Its zeolite products also have applications in catalysts, petroleum refining, concrete, solar energy and heat exchange, desiccants, pellet binding, horse and kitty litter, and floor cleaners, as well as carriers for insecticides, pesticides, and herbicides. United States Antimony Corporation was founded in 1968 and is based in Thompson Falls, Montana.