Explanation: Lignite is a type of coal that is formed from partially decomposed plant matter. It is the lowest rank of coal and has a lower energy content compared to other types of coal such as bituminous or anthracite. Economically exploitable lignite refers to deposits that are large enough and accessible enough to be mined and used profitably. The economic exploitation of lignite depends on several factors, including the quality of the lignite, the cost of extraction, and the demand for energy in the region.
In India, Tamil Nadu is known for its significant lignite deposits, particularly in the Neyveli area. The Neyveli Lignite Corporation Limited (NLC) is a major producer of lignite in India and operates several mines in the Neyveli region. The geology of Tamil Nadu supports the formation and extraction of lignite due to the presence of suitable sedimentary basins and the right conditions for the formation of lignite over millions of years.
The Neyveli lignite deposits are part of the Cuddalore district and are formed in the Tertiary age sedimentary basins. The lignite in this region is of good quality and is used primarily for power generation. The NLC has been instrumental in the development of lignite-based power plants in Tamil Nadu, contributing significantly to the state's energy needs.
It is important to note that while other states in India such as Andhra Pradesh, Karnataka, and Kerala have various mineral resources, they do not have significant economically exploitable lignite deposits. The specific geological conditions required for the formation and extraction of lignite are not present in these states to the same extent as in Tamil Nadu.
In conclusion, the economically exploitable lignite deposits in India are primarily found in Tamil Nadu, particularly in the Neyveli region, due to the favorable geological conditions and the presence of the Neyveli Lignite Corporation Limited, which has been a key player in the extraction and utilization of lignite in the region.