The value of BHP Billiton's Ravensthorpe and Yabulu nickel operations have been written down by $US2.1 billion ($A3.3 billion), which equates to three quarters of its total investments in the related projects.
The value of BHP Billiton's Ravensthorpe and Yabulu nickel operations have been written down by $US2.1 billion ($A3.3 billion), which equates to three quarters of its total investments in the related projects.