Mazayjan copper deposit is located in the Sanandaj - Sirjan metamorphic province and almost in the center of Iran.The host rocks of copper mineralization in this area are basic schist of Surian metamorphic complex whichare of Carboniferous age.\nMicroscopic studies showed that the mineralogical composition of the host rocks consist of albite, tremolite - actinolite, calcite, biotite and quartz,hencethe initial basic rocks are metamorphosed in greenschistfacies.Also,based on mineralographystudies,chalcopyrite, pyrite, marcasite, covellite, malachite,chrysocolla and hematite are present in theschist.Chalcopyrite, is the most important copper mineral in this area and it can be seen as a main phase and a secondary phase inclusions in other minerals.Pyrite crystals show graded bedding phenomenon that reflects the differences in the degree of over-saturation of fluids at the time of the Pyrite formation.Point analyses conducted on pyrite and chalcopyrite proved that these mineralsin terms of chemical composition are uniformed and do nothave compositional zoning. This indicates that the metamorphic phaseshas an effecton the primary sulfide minerals.Hence, the metamorphic processes are younger than the formation phase of sulfide minerals.\nEPMA method showed that examined pyrite and chalcopyrite do not include any kind of valuable elements.