Abstract: The vein type Pb-Zn-Cu deposits in Kurşunlu area are hosted by the Upper Cretaceos volcanicand volcanosedimentary units with an average attitude of N50°W / 75 - 85°NE. They contain galena, sphalerite, chalcopyrite, pyrite, chalcosite and hematite as ore minerals and accompained quartz, calcite and localy barite as gangue minerals.Previous sulfur isotope and fluid inclusion studies showed that the sulfur in sulfide minerals is magmatic origineand might have been leached from the surrounding volcanic rocks and mineralising fluid has a character of low salinityand dominantly contains NaCl (±KC1, CaCl, MgCl) indicating that the water may be meteoric origine.Oxygen and hydrogen isotope studies (81 8O = in the range of -3.4 ile +0.6 %o, 8 D = in the range of - 31.4 ile70.4 %o) show that the water in mineralising fluid is the deepsirculated meteoric water in mineralising fluid is the deepsirculated meteoric water with some 18O enrichment as a result of isotopic exchange reaction with the surrounding volcanic rocks. Carbon isotopic composition of CO2 in inclusion fluid indicate that the mineralising fluid might have penetrated trough the marine or terrestrial carbonate unites. According to the results of all field and laboratory investigations helded on the mineralization; it may be said thatthe vein type Pb-Zn-Cu deposits in the area were formed by the deep - sirculated meteoric water leaching the sulfur andpossibly metal ions from the surrounding volcanic rocks and depositing along the fault zones.