The parent company of Xstrata has been found to have systematically ripped off one of Africa's poorest countries, Zambia, by avoiding hundreds of millions of dollars in taxes through mechanisms like transfer pricing.

An audit carried out by the Norwegian office of global auditor Grant Thornton, at the request of the Zambian Revenue Authority, uncovered the tax-avoiding activities of Mopani Copper Mines, 76% owned by giant transnational commodities broker Glencore. Glencore domiciled in the Swiss tax haven of Zug. Mopani is controlled through another haven, the British Virgin Islands.