AUSTRALIAN miner OZ Minerals, which operates a gold concession in Mondulkiri province, has announced that a class-action suit has been filed against it at the Federal Court of Australia in Melbourne. The claim, which was launched by shareholders Wednesday, it said in a statement, was filed over allegations it had failed to disclose debts, reports said, which were due last November. The firm said in the statement it “will vigorously defend the claim”. Despite the announcement, the firm’s share price climbed 2.87 percent Thursday in Sydney to A$1.25 (US$1.13).