Coal India is the largest coal manufacturer in the world with total production of 567 MT in FY2018. Coal India produces 84% of the coal produced in India with a market share of 60% to 65%. The estimated geological resource of India coal stood at ~315 Billion tons as of 1st April 2017. Coal India has total coal reserves of ~88.4 Billion tons (68.6 BT resources + 19.8 BT reserves) as of 1st April 2013. Coal India operates 369 mines via 8 coal producing subsidiaries.