Rio Tinto mulls hefty impairment charge

• Rio Tinto (NYSE:RIO) is assessing an about $300M non-cash impairment charge related to its shareholding in Energy Resources of Australia (OTCPK:EGRAY).
• Citing weak market conditions, ERA, in which Rio Tinto has a 68.4% stake, said it would not proceed with the final feasibility study of its Ranger 3 Deeps uranium project in Australia.