Big miners such as Vale, Rio Tinto and Anglo American have written down nearly $50B in...

|By:, SA News Editor

Big miners such as Vale, Rio Tinto and Anglo American have written down nearly $50B in impairment charges in the past year, and more is expected this earnings season as expensive takeovers are reassessed. BHP may trim aluminum operation valuations, and Glencore may write down some assets acquired from Xstrata. In the mining world, bigger is better: big risks, big rewards and big egos.