The mines ministry said it will soon grant licence to global mining giant Rio Tinto to mine diamonds in Madhya Pradesh’s Bunder region. Rio Tinto has plans to invest `2,200 crore on a diamond mining project in the state for which it was granted prospecting licence in 2006. “We are examining a proposal by Madhya Pradesh government to grant mining licence to Rio Tinto at Bunder,” the mines secretary, Mr S. Vijay Kumar, said.