(FILES) This file photo taken on February 18, 2014 shows the sign of the BHP Billiton business centre in Melbourne. BHP Billiton reported an annual net loss of USD 6.39 billion on August 16, 2016 its worst-ever result, as the impact of a fatal mine dam disaster in Brazil and weak commodity prices hit the world's biggest miner. / AFP PHOTO / MAL FAIRCLOUGHMAL FAIRCLOUGH/AFP/Getty Images