Share price indicators for Rio Tinto (C) are displayed on the Australian Stock Exchange board in Sydney May 15, 2009. Miner Rio Tinto remains committed to a planned $19.5 billion tie-up with Chinese metals firm Chinalco, it said, responding to talk that the deal may be revised to let more shareholders take part in a rights issue. REUTERS/Daniel Munoz (AUSTRALIA BUSINESS IMAGES OF THE DAY ENERGY)