Dubey, who is Additional Secretary in the Coal Ministry, was given the additional charge of Chairman and Managing Director (CMD), after Narsing Rao resigned in May.
The Coal Ministry has "conveyed the approval for extension of additional charge of CMD of the company to Dr A K Dubey, Additional Secretary, Ministry of Coal for a further period of three months from September 25, 2014 up to December 25, 2014 or till a regular appointment is made or until further order whichever is earlier," CIL said in a BSE filing.
The government had earlier said it was open to hiring chairman and managing director of CIL from the private sector.
Coal India, which accounts for over 80 per cent of the domestic coal production, produced 462 million tonnes (MT) coal in the last fiscal as against the target of 482 MT.