Samuel 'Sam' Walsh, chief executive officer of Rio Tinto Group, poses for a photograph during a photocall ahead of the company's full-year results announcement at The London Stock Exchange in London, U.K., on Thursday, Feb. 11, 2016. Rio Tinto, the world's second-biggest mining company, scrapped its progressive dividend policy and set out new spending cuts as plunging commodity prices slashed full-year profit 51 percent. Photographer: Simon Dawson/Bloomberg via Getty Images