Swiss-headquartered Trafigura boasts of being the world’s second largest non-ferrous metals’ trader. In this regard, only Glencore pips it to the post. Notorious for its alleged dumping of tonnes of toxic wastes on the Ivory Coast in 2006, Trafigura runs its metals’ trading subsidiary, Galena, out of London, UK. The firm operates one mine in Peru and is now investing in another.