Abstarct: The western Kahang copper deposit is located in the Isfahan province, about 65 km south of Ardestan and 2 km west of Kahang village. The study area is situated in the middle part of UrmiahـDokhtar magmatic belt. The lithology sequence cover a range of felsic to mafic igneous rocks. Due to the influence of hydrothermal solutions, the rock units have undergone alteration and variation in chemical composition and texture. The extrusive igneous rocks comprise basalt, basaltic andesite and andesite and pyroclastic rocks are dacite and rhiodacite. The intrusive rocks have diorite, granodiorite, dacite and diabaxse in composition, and observe as abbysal and hypabbysal and dyke forms. In the Kahang area propylitic, phillic and intermediate argillic alterations are widely observed in the surface, however potassic alteration with the others alterations only seen in the core samples. The form and arrangement of alterations in area from outside to inside are as propylitic, argillic, phillic, and potassic, respectively. In this area, isn't observed any copper ore minerals (chalcopyrite, bornite, calcocite, covellite, malachite, azurite, etc.) in the outcrops, hence mineralography studies baxsed on selective samples from the cores. The primary ore minerals include magnetite, pyrite, chalcopyrite, molybdenite and galena, quartz, alkali feldspar, plagioclase, amphiboles, biotite, chlorite, epidote, sericite, clay minerals, tourmaline, apatite, anhydrite, calcite and … accompany the primary ore minerals. The secondary minerals are formed by supergene fluids and including digenite, covellite, malachite, hematite, goethite and limonite. baxsed on field evidence, manual and microscopic samples, mineralization structures include stockwork, veinـveinlet, disseminated and breccia forms, and textures are disseminated, veinـveinlets, breccia and replacement. The stockwork is dominant form of mineralization in the western Kahang area. The ore veins consisting of quartz+magnetite±chalcopyrite±chlorite veins, quartz+chalcopyrite±pyrite veins, quartz+molybdenite±chalcopyrite±pyrite-breccia¬and¬veins, quartz+pyrite+sericite±chalcopyrite±cholorite veins, tourmaline±quartz±chalcopyrite±pyrite brecciaand veins and calcite+galena±sphalerite±calcopyrite±pyrite veins. In this area, geochemical studies is baxsed on core samples. The Cu have ore grade and accompany with Mo. The average content of Cu in the mineralized zone is about 0.2 %. The Cu have maximum correlation with Mo and Au, and the correlations of Pb, Zn and Ag are significant in the multivariate statistics and similar to the element geochemical patterns in porphyry systems. baxsed on fluid inclusions petrography, the primary fluids are often twoـphase L+V fluids. The size of fluids are variable and their average is about 5 microns. Microـthermometric measurements demonstrate a temperature range of 430.5 to 560 °C, a salinities from 19.30 to 23 wt % NaCl and pressure from 2 to 6 kbars. The minimum and maximum trapping of fluids are 1000 and 3000 m from the surface, respectively. Regarding the large volume of phillic and low volume of potassic alterations in the western Kahang area display that the role of mediumـlow salinity fluids are important than magmatic fluids in this area. The presence of different salinity fluids in the mineralization system led to the formation of different types of mineralization in various parts of the Kahang area (eastern, central and western parts). According to geology, petrology, mineralogy, geochemistry and fluid inclusions studies, the western Kahang deposit introduce as porphyry copperـmolybdenum ore deposit, but it is a lowـgrade and nonـeconomic porphyry deposit.