Coal India Limited (CIL) is an Indian state-owned coal mining and refinery company headquartered in Kolkata, West Bengal, India. It is the largest coal-producing company in the world and a Maharatna PSU. 

The company contributes to around 82% of the coal production in India. It produced 554.14 million tonnes of raw coal in 2016-17, an increase from its earlier production of 494.24 million tonnes of coal during FY2014–15 and earned a revenue of ₹95,435 crore (US$13 billion) from sale of coal in the same financial year. 

As on 14 October 2015, Union Government of India owns CIL and controls the operations of CIL through Ministry of Coal.

In April 2011, CIL was conferred the Maharatna status by the Union Government of India, making it one of the seven with that status.

As on 14 October 2015, its market capitalisation was ₹2.11 lakh crore (US$30 billion) making it India's 8th most valuable company by market value. 

Coal India Limited (CIL) produces coal through seven of its wholly owned subsidiaries. These are Eastern Coalfields Limited (ECL), Bharat Coking Coal Limited (BCCL), Central Coalfields Limited (CCL), Western Coalfields Limited (WCL), South Eastern Coalfields Limited (SECL), Northern Coalfield Limited (NCL), and Mahanadi Coalfields Limited (MCL).

According to en.wikipedia

 

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