Öz Tbe Bakacak ore consist of Pb-Zn and Pb-Zn«Cu veins. These veins represent essentîally kata and meso-thennal zones and in some cases reach to the hottest pârts of the epi-thermal zone. In the paragenesis enargite and uraninite are present which represent typical minerals of the hydrothermal origin. The uraninite is reported for the first time in the Bakacak ore deposit during th is researeh. Quartz, amethyst and calcite are the majör gangue minerals. The hydrot­ hermal Solutions which lead to the formatin of ore veins also cause intensive alteration of the waU rock.