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