Mining giant BHP Billiton has flagged an impairment of up to $US2 billion ($A2.7 billion) in its end of financial year results against the value of its onshore gas assets in the US.
Mining giant BHP Billiton has flagged an impairment of up to $US2 billion ($A2.7 billion) in its end of financial year results against the value of its onshore gas assets in the US.