Total Lignite Reserves = Sum of Proved, Inferred and Indicated Reserves. These visualizations are based on the following document, released by the Ministry of Statistics : Energy Statistics 2012. In case you're interested in a quick look at the relevant table used in TSV format, the table for Lignite reserves is available here. Tamil Nadu and Gujarat are the main lignite-rich states.
Below this, are maps indicating the break ups of total, inferred and indicated lignite reserves.
(Above) Maps indicating the break up of proved, inferred and indicated lignite reserves in India. Also, a percentage wise distribution of India's estimated lignite reserves across the main lignite-rich states.