Report of the geological survey techniques and Design Finalization Reservoir Sadawarna, 2011, mentioned that at the base of the river Cipunagara precipitated a mix between Boulder/bongkah, heterogeneous among other bongkah rocks of Andesite, Basalt, Breksi, Metasedimen, with a maximum diameter of 3 meters, shaped, angled off responsibility, have the quality of hardness hard to very hard.
The location is in a radius of 5 km from the location of the rencanan dam, found 2 stone material location that allows it to be exploited.