The Murgul massive sulfide deposit is located in the eastern part of the Pontide island are and is associated with dacitic domes and dacitic pyroclastics located along the margin of a caldera with a diameter of approximately 35 km. In the mine area a lower sequence of mafic rocks is overlain by felsic units (host to the ore), which in turn are overlain by upper mafic rocks, arl of Upper Cretaceous age. The footwall consists of dacites and dacitic pyroclastic rocks, whereas the hanging wall consists of chemical sedimentary rocks, gypsum-bearing vitric tuffs, second- stage dacites which contain epithermal Au mineralization, accretionary lapilli tuffs, purple colored vitric tuffs, third-stage purple dacites (with no mineralization), and epiclastic rocks. The first stage dacitic domes grade from a massive core to flow brecciates and hyaloclastites towards outer portions. Geologic and petrographic features of the host rocks indicate a shallow marine environment for the formation of the massive sulfide ores. The three dacitic groups have same primary mineralogy and show similar chondrite-normalized REE patterns.