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The Alpine Orogenic Belt with numerous porphyry Cu-Mo-Au mineralizations, starts from EasternEurope continues through Turkey and the Caucasus and extends into Iran and Afghanistan. The studyarea of the Eastern Pontides is in this orogenic belt. Using fi eld and laboratory studies an attempt hasbeen made to establish the origin of Yeşilbağlar, Kaban and Köprübaşı alteration zones in the Olurarea (Erzurum). In the study area Early Eocene Coşkunlar volcanics and sub volcanic rocks havecontact with the Oltu çayı volcanics of Early-Middle Jurassic. Alteration in the study area effects theseOltuçayı and Kaban volcanics. In the study area mineralizations are present in the alteration zones.Disseminated, stockwork, vein/veinlet and fi ssure type mineralizations are present in the Coşkunlardacite. Paragenesis in the alteration zones are pyrite, chalcopyrite, sphalerite, galena, pyrrohotite,quartz, calcite and barite. FT-IR and XRD studies showed the presence of clay, sulphate, sulphur,carbonate, silicate and oxide minerals in the alteration zones. Field and petrographical studiesshowed that alteration types in the Yeşilbağlar, Kaban and Köprübaşı areas are, advanced argillicargillic,pyropylitic and sericitic. They are similar to the alterations present in the upper part of themineralizations in the porphyry systems of the Alpine Orogenic Belt. In the Eastern Pontides starting inEarly Jurassic, continuation of subductions resulted in closure of the İzmir-Ankara-Erzincan ocean andin Early Eocene the Taurid platform collided with the Eurasian active continental margin. Data fromthe study area indicate the presence of alteration zones in the upper part of the buried porphyry systemand the possibility of mineralized parts in the deeper parts of the system.