The Koru lead-zinc deposits are located in the Biga Peninsula which is a very rich zone in terms of both metallic ores and industrial minerals. This high abundance of metallic and industrial minerals of the region is related to the volcanic and tectonic activities that have developed during different geological periods. Barite accompanies the lead-zinc mineralization of the Koru deposits, associated with Tertiary volcanic rocks. Pyrite, chalcopyrite, bornite, chalcocite, quartz and carbonate minerals are also present. This research focused on geochemical ways of investigation of depositional properties of BaSO(4)-Pb-Zn formations.