Mahanadi Coalfields has filed its RHP for a proposed ₹9,500 crore IPO. Parent Coal India plans to sell a 10% stake through an offer for sale of up to 66.18 crore shares. Mumbai: State-owned Coal India Limited has taken a major step towards listing its subsidiary Mahanadi Coalfields Limited (MCL), with the company filing its Red Herring Prospectus (RHP) for a proposed initial public offering (IPO) estimated at approximately ₹9,500 crore.