Anglo American plc is a multinational mining company headquartered in London, United Kingdom. It is the world's largest producer of platinum, with around 40% of world output, and a major producer of diamonds, copper, nickel, iron ore and metallurgical and thermal coal.he Oppenheimer family remains the largest shareholder of Anglo American, however, they have divested their interests in De Beers. Anglo American Plc. sold a 24.5 percent share in its Chilean copper unit for $5.39 billion to Japan's Mitsubishi Corporation paid with a promissory note which is due on 10 November 2011.