Aug. 27: Tata Steel is planning to acquire iron ore and coal mines in Africa, Brazil and Canada, which could contribute 50 per cent captive raw material by 2015. Addressing the annual general meeting of Tata Steel on Thursday, Mr Ratan Tata, the chairman of Tata Sons, said: "The acquisition of mines would ensure the raw material supply not only to the UK operations but the Indian operation also. Due to the global meltdown, the operations of Tata Steel