Andrew Mackenzie, chief executive officer for non-ferrous at BHP Billiton Ltd., right, speaks as Marius Kloppers, chief executive officer, left, and Jacques 'Jac' Nasser, chairman, smile during a news conference in Sydney, Australia, on Wednesday, Feb. 20, 2013. BHP Billiton, the world's biggest mining company, named its copper unit head Andrew Mackenzie as chief executive officer to succeed Marius Kloppers before reporting a 58 percent decline in first-half profit. Photographer: Ian Waldie/Bloomberg via Getty Images
{"Image ImageDescription": "Andrew Mackenzie, chief executive officer for non-ferrous at BHP Billiton Ltd., right, speaks as Marius Kloppers, chief executive officer, left, and Jacques \"Jac\" Nasser, chairman, smile during a news conference in Sydney, Australia, on Wednesday, Feb. 20, 2013. BHP Billiton, the world?s biggest mining company, named its copper unit head Andrew Mackenzie as chief executive officer to succeed Marius Kloppers before reporting a 58 percent decline in first-half profit. Photographer: Ian Waldie/Bloomberg via Getty Images", "Image Copyright": "2013 Bloomberg"}