Coal India Limited (CIL) contributes to about 82 per cent of India's coal production. In When Coal Turned Gold, former CIL chairman and managing director Partha Sarathi Bhattacharyya tells the story, warts and all, of how he tackled the Dhanbad coal mafia, changed the way the industry was perceived, dealt with the trade unions and the government and, most importantly, scripted one of the greatest success stories the country has ever seen.