Mining giant BHP Billiton says it was not aware that the tailings dam at its Samarco joint venture in Brazil was at risk of collapsing, despite a series of efforts over years to fix its structural defects.
Mining giant BHP Billiton says it was not aware that the tailings dam at its Samarco joint venture in Brazil was at risk of collapsing, despite a series of efforts over years to fix its structural defects.