Coal India Ltd.

Coal India's largest subsidiary -- South Eastern Coalfields has pumped in Rs 1,457 crore in mining technology to ramp up production. A large number of heavy mining machinery has been procured to deploy in its key mines like Gevra, Kushmunda and Dipka to augment output.

Coal India is the world’s largest coal mining company. It also produces non-coking coal and coking coal of various grades for diverse applications.