Prime Infrastructure Group (PIF AU), operator of Australia's second-biggest coal-export terminal, sank 17 cents, or 13 percent, to A$1.15. The Queensland Competition Authority proposed a reduction in the price Prime can charge for handling coal at the Dalrymple Bay terminal in Queensland to A$1.53 per metric ton from A$2.08 a ton, the Brisbane-based company said in a statement to the Australian Stock Exchange. Prime initially sought a 33 percent increase in the charge to A$2.77 a ton.