Coal India (CIL) which accounts for over 80 per cent of domestic coal production is eyeing one billion tonnes of output by 2020.
The company's production target in April-May was 86.5 MT, CIL said in a BSE filing.
CIL produced 40.7 MT of coal in May against the target of 44 MT.
The state-owned CIL produced 38.44 million tonnes of coal in April, falling short of the target of 43.58 MT.
The company had missed the annual production target by 44.48 MT against a target of 598.61 MT for 2016-17.