Abstarct: Chah Aroos index has located in Semnan province, south east of Shahrood city, in 50 Kilometers of south east of Biarjomand, in 20 kilometers west of Chah aroos area. Rooygaran located in 40 kilometers of south west of Chah aroos area. Rock units of this area has divided in 2 groups: 1) host units with the age of Jurasik that contains: Sand stone, Shale, lime stone and Conglomerate that has crossed by middle Jurassik dikes in some parts, 2) Eocene host units contain 3 groups: A) submarine lava (Basalt, Tracy Basalt), B) Pyroclastic (Toof and Aglomera) and 3) sedimentary (limestone, Marne and Conglomerate). Volcanic rocks belongs to middle to high potassium calc-alcaline magma series and has formed during kind of an active continental margine volcanic arcs of tectonical regime. Factors that affected on copper mineralization include: 1) covering rock units, 2) constructional controls, 3) hydrothermal solutions and 4) existence of intrusive masses in depth that has the most effective role in transportation of hydrothermal solutions, aggregation and deposition. Mineralization in Chah asad and Rooygran has happened in youngest horizontal magmatic units in shape of strata bound and veinlet along faults in sandstone units in Chah Aroos. Mineral has formed in the shape of vein and veinlet, open space filling and disseminated. The most important mextamorphisms of the area are Argilic, Zeolitic, siliceous and Carbonatic. Main minerals of the indexes are divided in 3 groups: Sulfidic minerals (Chalcocite, Bornite, Chalcopyrite, pyrite and Digenite), Carbonatic minerals (Malachite, Azurite), Oxidic minerals (Cuprite, Magnetite, Hematite, and Limonite) and siliceous minerals (Chrysocolla). The most important texture of the area include: vein and veinlet, open space filling, disseminated and replacement. By the micro-thermometry research, temperature of homogenization in Chah Aroos area is between 90°C to 210° C. The range of salinity is between 2 to 12 Wt% of NaCl. In the end by the researches that has done, we could say that mineralization is similar to Manto type mineral deposit in Chah Asad and altered veinlet type in Chah Aroos.