Washington-based group, Global Financial Integrity, in its report revealed that more than £5 billion (K40 trillion) had been illegally siphoned out of Zambia over 10 years, with most of it ending up in offshore banks and tax havens. Among the mining companies active in Zambia are Glencore and Vedanta.
See http://www.minesandcommunities.org/article.php?a=12069.