Adani Enterprises is to invest $6.9bn to develop coal, rail and port projects in its Galilee Basin coal mine in Queensland, Australia.

The company expects its first coal output by the end of 2014, and to be producing of 50-60 million tons of coal by 2022.

Adani, India’s biggest coal importer, acquired the Galillee coal mine for $3bn from Linc Energy in August 2010.

India’s thermal-coal imports almost doubled to 60 million tonnes last year, as the nation increased electricity generation capacity.