Abstract: Tpo types of lead-zinc deposits were studied in western Anatolia. Tha first is the strata-bound type deposits (IzmirBay mdir-Sariyurt) and the second is the hydrothermal-contact metasomatic type deposits that are related to the granitoid intrusions in the Biga Peninsula.All the deposits studied occur in similar metamorphic schists, except for the Yenice-Arapuç an hydro thermal-matasonaticdeposit that is found in sandstones and the Balya deposit that is in dacites at the contact with limestones.Galena and sphalerite are the main ore minerals in both types of the lead-zinc deposits. Chalcopyrite, pyrite, pyrrhotite,hematite, magnetite, ilmenite and rutile may also be present in minor quantities. In addition, minor- trace quantities of tetrahedrite-tennantite, antimonite, arsenopyrite, bournonite, boulangerite, jamesonite, heyrovskyite, bismuthinite, native bismuth,orpiment and realgar were found in the Balya deposit; and jamesonite, mareasite and arsenopyrite in the Torbalı-Taşkesik deposit.The geological and mineralogical studies suggest that the hydro termal-contact metasomatic lead-zinc deposits of the BigaPaninsula were formed as a result of the remobilization of the strata-bound type deposits by the granitoid intrusions in this region.In conclusion, the lead-zinc deposits of the Biga Peninsula can be attributed to the polygene tic class of ore deposits.