Coal India Limited (CIL) is a 'Maharatna' Public Sector Undertaking under Ministry of Coal, Government of India with headquarters at Kolkata, West Bengal. CIL is the single largest coal producing company in the world and one of the largest corporate employers. CIL operates through 85 mining areas spread over eight provincial states of India. CIL has 310 working mines of which 129 are underground, 168 opencast and 13 mixed mines. CIL further operates 13 coal washeries, and also manages other establishments like workshops, hospitals, and so on. The Company produces non-coking coal and coking coal of various grades for diverse applications. Most of the coal production is from open cast mines. Others include cement, fertilizer, bric