ABSTRACT: Within the framework of this study, alteration feautures of the ore deposit, host rock alteration of copper-moiybdenium mineralization located around Domaniç (KÜTAHYA) have been studied by examination of drilling cores that were recovered by MTA during 1992-1993.Two diffèrent rock types, namely plutonic and subvolcanic, are distinguished within the study area, Plutonic rocks show as granular and porphyritic textures. The plutonic rocks which have granular texture are tonalite, granodiorite, quartz-diorite and granite, The other plutonic rocks with porphyritic texture are tonalite porphyry, quartz-diorite porphyry, granodiorite porphyry diorite porphyry and granite porphyry, Subvolcanic rock is aplite. The rocks except aplite in the study area are altered and mineralized Four different alteration types are distinguished in the rocks associated with mineralization. On the basis of alteration minerals.. These are (1) biotite-quartz, (2) sericite-quartz, (3) quartz-clqy-chlorite and (4) chlorite-epidote-quartz alteration types which exhibit an alternating pattern in the cores, Furthermore, a secondary alteration that is exhibited in the first meters of the drillings is amortization, Hetnatitization and argillization that has been formed by surface waters are also observed.