OZ Minerals said it lifted copper production 21 per cent in the December quarter to meet its full-year guidance, but is warning of higher electricity costs going forward.
The miner, whose shareholders will have a chance to approve or reject BHP's $9.6 billion takeover offer in late March or early April, said it produced a record 36,307 tonnes of copper in the fourth quarter, up 12.8 per cent from a year ago.
