Xstrata

Xstrata has major operations/projects in eighteen countries (Australia, Argentina, Brazil, Canada, Chile, Colombia, the Dominican Republic, Germany, Jamaica, New Caledonia, Norway, Papua New Guinea, Peru, South Africa, Spain, Tanzania, the United States and the United Kingdom) and it is a major producer of copper, coking coal, thermal coal, nickel, ferrochrome, vanadium and zinc. It has smaller scale involvement in aluminum, gold, lead and silver.

read more in http://en.wikipedia.org/wiki/Xstrata.

Aluminum

Aluminium is the most widely used non-ferrous metal. It exceeded that of any other metal except iron.

read more in http://en.wikipedia.org/wiki/Aluminium and http://en.wikipedia.org/wiki/List_of_countries_by_aluminium_production

Rio Tinto Alcan

Rio Tinto Alcan Inc. is Canada's largest Aluminium company and the world's third largest.

read more in http://en.wikipedia.org/wiki/Rio_Tinto_Alcan

RUSAL

United Company Rusal (Russian: Российский алюминий)) is the world's largest aluminium company. United Company RUSAL accounts for almost 12.5% of entire global output of primary aluminium and 16% of the world’s alumina production.

read more in http://en.wikipedia.org/wiki/Rusal.

Alcoa

Alcoa is the world's third largest producer of aluminum, behind Rio Tinto Alcan and Rusal.

read more in http://en.wikipedia.org/wiki/Alcoa.