No Minerals of Economic Importance found in Thanjavur District, except Gravel, Laterite, Red Soil, Brown Clay, filling Earth and sand. Gravel, Red Soil and Filling Earth are used as filling material in construction works. Brown clay is quarried and used in Country kiln and Chamber Kiln for making of Bricks.

Mainly two type of Minor Minerals constituents such as sand and gravel are required for any type of construction apart from other material like cement and steel. In earlier times, the houses / buildings were constructed in the form of small dwellings with walls made up of mud plaster, stone, and interlocking provided with wooden frames and there were negligible commercial as well as developmental activities resulting in less demand of binding materiel

Now a days, new vistas of development activities are started and increase the consumption of Minor Mineral such as sand, Gravel, filling Earth etc. Tamilnadu State is highly urbanized state in Indian sub continent after Maharashtra, the demand of minor mineral in the Thanjavur District has started increasing trend.

The office of the Assistant Director, Department of Geology and Mining is functioning under the control of District Collector, Thanajvur. The Assistant Director, Geology and Mining supports the District Collector in the Mineral Administration works.