In Krishnagiri district, quarry leases are being granted for granite in Patta lands. Rough stone and earth quarry leases are being granted in government and patta lands under Tamil Nadu Minor Mineral Concession Rules 1959. The Public Works Department (WRO wing) is operating sand quarry in riverbeds. A state owned corporation called Tamil Nadu Metals and Mineral Ltd is also earning quarry and mining grants in government lands. The total mineral revenue realized during 2006-07 was Rs. 7.45 crores. It is ascertained that nearly 7,000 workers are being engaged in quarry activities. 