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Carbonate rocks of upper Paleozoic host barite ore deposits in the Central Iran. Main ore mineral is barite that shows crosscut relationships with its host rocks and occurs as veins and veinlets. Barite is associated with gold-bearing chalcopyrite. Faulting, fracturing and brecciation were important ground preparation processes in the host rock. Jasperoidization of the host rock prior to barite deposition is another ground preparing process. Open space structures had been filled by ore minerals, hydrothermal calcite and white sparry dolomite. Boiling episodes in the ore-bearing fluids, upon their arrival to the low-pressure dilation zones, along with influx of highly oxidized groundwater provided ideal conditions for ore mineralization. The studied ore deposit could be classified as epithermal based on its temperature of formation (167±11?C), shallow depth, open-space filling structures, mineral assemblages, and jasperoid alterations. Secondary alterations in the primary sulfide minerals had been induced by galvanic reactions, which resulted in formation of various secondary ore minerals. Mineralization in the studied area is in association with the magmatic activities of the early Kimmerian orogeny.