The mineral base of this state is very rich. Particularly the Chotanagpur plateau is very mineral rich field. It has an extensive and high quality coal deposits. Iron ore and copper ore are also produced in Bihar. Bauxite, ore for aluminium is also found here. This state has a reserve of pyrites and mica. The other important mineral resources found in Bihar are – limestone, graphite, chromite, manganese, nickel, barytes, kyanite and sillimanite, bentonite etc.