There are several Cooper tools have found in Chota Nagpur Plateau which are from 2nd millennium BCE. These Copper finds known as Copper Hoard Culture. In Kabra-Kala mound at the confluence of Son and North Koel river in Palamu district various antiquities and art objects have found which are from Neolithic to Medieval period and the pot-sherds of Redware, black and red ware, black ware, black slipped ware and NBP ware are from Chalcolithic to late medieval period.