aluminum

Aluminum Corporation of China Limited (Chalco) has masterminded its way into mixing alumina and aluminum. Chalco is the only maker of alumina -- which is refined from bauxite and a key material in producing aluminum -- in China. The company produces about 9 million tons of alumina products (including alumina, alumina hydrate and alumina chemicals), which makes it the second-largest maker of alumina in the world. Chalco also produces a million tons of primary aluminum annually. In 2007 the company agreed to acquire sister company Baotou Aluminum for about $2 billion.

Rio Tinto is a multinational mining and resources group founded originally in 1873. The group is one of the world's largest mining companies. Since 1995, Rio Tinto has been a dual listed company. Rio Tinto Limited, formerly known as CRA, is listed on the Australian Securities Exchange, with Rio Tinto plc (formerly RTZ) listed on the London Stock Exchange as well as New York Stock Exchange (under ticker RTP).