The total estimated quantum of coal resources in the country is 301.56 Billion Tonnes as per The inventory of Geological Resources of Indian Coal (as on 01.04.2014), prepared by the Geological Survey of India (GSI). However, with current rate of production compared to proved reserves of about 126 Billion Tonnes , this is expected to last for about 100 years. This was stated by Sh. Piyush Goyal, (Minister of state for Power, Coal & New and Renewable Energy (Independent Charge) in a written reply to a question in the Rajya Sabha today.