Rio Tinto to invest $500 million in diamond project in India
Company waiting for environmental approvals, says CEO
 "Rio Tinto to invest $500 million in diamond project in India")
Global mining company Rio Tinto plans to invest $500 million in a diamond project in Madhya Pradesh state, its Chief Executive Officer Sam Walsh said on Monday.
The company is waiting for environment approvals from the Indian authorities before starting the project, Walsh told reporters.