Abstarct: The Chah-Gol gold deposit is located in Isfahan Province, the Ardestan County and in the Mahabad district. Tectonically, the area lies in the central part of the Cenozoic Urumieh–Dokhtar magmatic arc. The exposed lithological units include volcanic rocks (olivine basalt, basalt, basaltic andesite, andesite, and porphyritic andesite), pyroclastic rocks (andesitic lithic tuff, crystal tuff, and carbonate shale tuff), and sedimentary rocks (carbonate tuffaceous shale and gypsum). Gold mineralization in the Chah-Gol area mainly occurs as vein–veinlet systems and less commonly as breccia and disseminated mineralization, predominantly within volcanic and pyroclastic rocks and along fault planes and fractures. The mineralization evolved through two main stages: hypogene (endogenic) and supergene (exogenic). The primary hypogene minerals include pyrite, chalcopyrite, sphalerite, and galena. These minerals have undergone alteration and oxidation, forming secondary minerals such as bornite, chalcocite, covellite, malachite, cerussite, and native copper. Iron oxides and hydroxides including goethite, limonite, hematite, and rarely atacamite are widely observed in the area, indicating the presence of an oxidation zone. The alteration assemblages in the area include propylitic, argillic, silicic, sulfidic, iron-oxide, sulfate, and carbonate alterations. The silicic–sulfidic alteration zone (the baxse and precious mextal mineralization zone) is surrounded outwardly by argillic and propylitic alteration zones, respectively. Geochemical analyses indicate that the volcanic rocks of the region formed in a continental margin magmatic arc associated with subduction-related orogenic settings. The magmas responsible for these rocks have a high-K calc-alkaline affinity. In terms of trace elements, these rocks are enriched in large ion lithophile elements (LILE) such as Cs, Rb, Ba, Sr, and Pb, and depleted in high field strength elements (HFSE) such as Nb, Ta, and Ti. This pattern suggests that the parental magma originated from partial melting of a mantle wedge influenced by fluids released from the subducting oceanic crust. The presence of a negative Eu anomaly indicates plagioclase fractionation during magma crystallization. In the Chah-Gol mineralization system, positive correlations are observed between Au–Cu, Ag–Pb, Pb–Cd, and Cd–Zn. The average grades of gold and copper in surface samples are 1.47 g/t and 0.44%, respectively. Sulfur isotope analyses of pyrite, chalcopyrite, sphalerite, and galena show average δ³⁴S values of +5.6‰, +4.1‰, +3.8‰, and +2.9‰, respectively, suggesting a magmatic origin for the fluids with mixing of meteoric waters. Fluid inclusion studies on sphalerite indicate that mineralization in the Chah-Gol deposit occurred from two-phase liquid–vapor hydrothermal fluids with homogenization temperatures ranging from 140 to 295 °C and salinities between 4.6 and 16.3 wt.% NaCl equivalent. These fluids were formed at depths of less than 500 m and pressures below 70 bars, indicating a shallow hydrothermal system influenced by surface-derived fluids. baxsed on the main characteristics of the Chah-Gol deposit, including tectonic setting, host rocks, mineralogy, alteration patterns, and comparison with known epithermal deposits, the Chah-Gol deposit can be classified as an intermediate-sulfidation epithermal gold deposit.