BHP Billiton said it said was reviewing its iron ore production guidance for fiscal 2016, following a deadly mudflow and flooding disaster at a mine in Brazil, which analysts described as a severe blow for the world's biggest miner.

At least two people died and as many as 28 are missing after a dam ruptured at the Samarco Mineração mine and unleashed floods and mud that swept as far as 100 km (60 miles) from the mine.