File photo of remote-controlled stackers and reclaimers moving iron ore to rail cars at Rio Tinto's Port Dampier operations in Western Australia's Pilbara region. Iron ore, mostly from the Pilbara ... more 

File photo of remote-controlled stackers and reclaimers moving iron ore to rail cars at Rio Tinto's Port Dampier operations in Western Australia's Pilbara region. Iron ore, mostly from the Pilbara region in Western Australia, currently represents nearly 80 percent of the company's earnings less