Koderma district is rich in minerals. The Koderma district and the Lokai-Indarwa area covers the southern part of Great Mica-Belt of Jharkhand, Bihar, and India. Previously the Mica belt was known as Bihar mica belt which extends for a distance of 160 km having an average width of 25 km. The mica belt stretches from Gurpa in Gaya district in the west through Nawada, Koderma, Hazaribagh, Giridih in Jharkhand and Jamui as well as Bhagalpur district of the Bihar state in the east. Its maximum width is about 40 km at Koderma-Hazaribagh-Nawada area.