These links give some details on Glencore...
http://www.glencore.com/pages/company_overview.htm
http://www.glencore.com/pages/copper.htm
Glencore, itself or through the global reach of its subsidiaries, markets Zinc, Lead and Copper concentrates, which are the raw materials used to produce Zinc, Lead and Copper metals, as well as valuable by-products such as Silver. In addition to marketing these concentrates, sales are made of Zinc, Lead and Copper metals produced from concentrates processed through facilities owned by our subsidiaries and through facilities owned by others through tolling arrangements. Glencore and its subsidiaries also market Zinc, Lead and Copper metals purchased from third parties.
The marketing of these commodities is global, involving the commodity flows from raw material producers in regions including Canada, Australia and South America to consumers in Western Europe, China, Southeast Asia, the U.S. and Japan where these materials are smelted and refined to metals.
Glencore own 35% of Xtrata.
http://www.xstrata.com/
Xstrata is a global diversified mining group, listed on the London and Swiss Stock Exchanges, with its headquarters in Zug, Switzerland. Xstrata’s businesses maintain a meaningful position in seven major international commodity markets: copper, coking coal, thermal coal, ferrochrome, nickel, vanadium and zinc, with additional exposures to platinum group metals, gold, cobalt, lead and silver, recycling facilities and a suite of global technology products, many of which are industry leaders. The Group's operations and projects span 18 countries: Argentina, Australia, Brazil, Canada, Chile, Colombia, the Dominican Republic, Germany, New Caledonia, Norway, Papua New Guinea, Peru, the Philippines, South Africa, Spain, Tanzania, the USA and the UK. Xstrata employs approximately 50,000 people, including contractors.
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Muzz
ZFX
zinifex limited
