Brazil mining giant rejects UN anger over 'toxic' flood

Mining giants responsible for a dam spill in Brazil earlier this month rejected Thursday accusations by the United Nations that "20,000 Olympic swimming pools of toxic mud" spewed into a river. The November 5 collapse of a waste-water dam at the Samarco iron ore mine owned by the world's biggest mining corporation BHP Billiton and its Brazilian partner Vale triggered a flood of muddy water that killed at least 13 and left 11 people missing, according to the latest toll. Fifty million tons of was