The Masjeddaghi area, located in the Jolfa 1/100000 geological map sheet, is a part of West Alborz zone - Azarbaijan. The oldest rock unit outcropped belongs to the Eocene flysh, widely distributed in the southern and north eastern part of the area.The other outcrops are mainly volcanic rock complex of andesite and trachyandesite affected by quartz monzonite intrusives and produced phyllic and carbonate phyllic alteration. The mineralization in volcanic complex is mainly silicic and barite veins. SEM and mineralography studies indicate the occurrence of sulphide mineralization especially Cu, Pb, and Zn sulphides. In addition, various pyrites occur as primary and secondary minerals. The galena and sphalerite mineralization can be observed in the main vein but not in the altrated area. SEM study indicates absence of gold in sulphide minerals. On the other hand fluid inclusionstudies show slow temperature gold formation (120 - 150°C) and very low salinity which specify probably that the gold is not carried along with chloridric complex in this stage. Evidences like parageneses, elements, gangue and alteration around silicified veins all indicate the presence of a polymetal gold - copper vein ore deposit of epithermal origin with high sulphide values.

Listvenites are formed during the CO2-rich fluids ultramafics interactions. Commonly, these carbonatized ultramafic rocks (especially serpentinites) are characterized by quartz and Mg-Fe-Ca carbonates assemblage. gold mineralization in these rocks had been a new target for exploration during the past decades.There are two main ophiolitic belts in Central Iran, Dehshir-Surk-Nain belt and Jandagh-Anarak belt. Hydrothermal alterations have produced listvenites and finally birbirites (silicified serpentinites) in ultramafic members of these ophiolites. In Dehshir, listvenites and paralistvenites are outcropped along the ophiolite belt and are barren. In Surk, listvenitization is followed by bribirites formation and gold mineralization has a close association with ferrite chromites. There is pyrite mineralization in highly silicified serpentinites with Au-Hg anomaly in Nain ophiolites. In Jandagh serpentinites, talc-carbonate rocks are formed during carbonatization. Trace amounts of gold anomaly are detected in these rocks. Anarak old ophiolites have widespread listvenitization. Various minerals and ore minerals with multistage paragenesis are characteristic. In addition to geochemical anomaly, gold mineralization is detected as visible gold.

Barika gold mineralization occurred in a Cretaceous metavolcano-sedimentary sequence at northwestern Sanandaj-Sirjan zone. Major units in this area include Cretaceous Submarine volcano-sedimentary rocks. Host rock of mineralization is rhyolite to rhyolitic tuff unit which is completely in Barika shear zone. mineralization occurred as lenticular ore bodies that has developed parallel to Barika shear zone foliation. mineralization from footwall to hanging wall consists of: 1- Silica-Sulfide zone, which includes two part, pyrite-rich part and quartz with sulfide veins that crossed with shear zone foliation. gold grade in pyrite-rich part is between 0.02 to 5 ppm and in quartz sulfide-bearing veins is between 0.05 to 0.5 ppm. 2- Sulfide and sulfosalt-rich zone. This zone contains of two part, pyrite-sphalerite-sulfosalt and massive pyrite part. gold grade in this zone is 0.02 to more than 100 ppm. 3- Massive barite ore zone. This zone included of some barite lenses that longer lens has 10 thickness and about 60 m length. This zone is contained two parts, a sulfide and sulfosalt-rich part and sulfide and sulfosalt-poor part. gold grade in sulfide and sulfosalt-rich part is between 0.02 to 25 ppm. Major minerals in mineralization zones are pyrite, sphalerite, galena, tetrahedrite-tenantite, bournonite-boulangerite, twinnite-veenite, stibnite, electrom, chalcopyrite and covelite. Electron microprobe studies on different minerals showed that gold occurs as electrom, and in minerals compose such as pyrite, galena and sulfosalts. The most important characteristics of mineralization of the Barika gold mineralization such as tectonic setting, host rocks, mineralogy, metal contents and metal zonation, wall rock alterations, shows similarities with gold-rich volcanogenic massive sulfide (VMS) deposits, e.g. , Rosbery, Hellyer and Que River deposits in Tasmania and some Kuroko type deposits at Hokuroko Basin, Japan.

Kuh–e-Zar gold deposit located in central part of Khaf–Bardaskan volcano-platonic belt and about 40 km west of Torbat-e-Heydariyeh area in Khorassan-e-Razavi province. The extensive exploration of the last decade done in the above belt has been caused the exploration of several Iron oxide copper–gold deposits, such as Kuh-e-Zar deposit. Several types of Tuff and Acide to intermediate lavas (lover tertiary) are widespread all over in the area. mineralization appeared in different type such as vein, stockwork and Hydrothermal breccia in strike sleep fault zone which are hidden inside volcano plutonic rocks.The average gold grade is between 3.02 ppm and ore reserve is estimated more than 3 million tons (cut off grade = 0.7 ppm). The copper grade in mineralized zone located in intrusive bodies between 0.3 to 1.1%. The main mineralized zones are Quartz and specularite (more than 30%). However, the various types of sulfides are very rare on surface. Pure gold can be observed together with Quartz and Specularits. Based on consideration of oxygen stable isotope (d18O) in Quartz and siderite as well as sulfur (d34S) in chalcopyrite, geochemical investigation and micro thermometric study has caused the gold mineralization through magmatic fluid with low sulfide content and high oxidation state. It is clear that the kuh-e-zar mineralization in case of paragenesis, alteration and dimension has been the only case all over the world. Regarding the lack of recognized and similar sample in the world, this deposit is a new and different variety of Iron Oxide Cu-Au (IOCG) deposit. It is introduced and named as Iron Oxide gold deposit (IOG) or Specularite rich gold deposits. This deposit has unusual richness in gold and LREE and is poor in copper.

Introduction: The Gholgholeh area is located in 40 Km southwest of Saghez city and in northwest of Kordestan province. This area is situated in the Saghez 1:100,000 Geological map sheet. This mine is situated in northwest of Iran with upper Cretaceous age. From the viewpoint of general geology, this area is part of the Sanandaj-Sirjan metamorphosed zone.The case of study in the oldest rock-unit outcrops in the north of this area which belongs to Percambrian gneiss. Permian deposit mostly distributed in north, northeast and northwest of this area.Aim: The aim of this study is gold and its element mineralization in Qholqholeh area. This case can start to identification of mineralization in the studied area and their parts.Material and Methods: Course and model mineralization can be investigate to help of desert study, mineralography, geochemical analysis, SEM, thin and polish section and fluid inclusion study.Results: The major types of alteration are composed of silicification, sulfidation, sericitization, chloritization and carbonatization. sercitization and choritization are the most, widespread alterations, whereas, silisification and carbonatizatin are usually limited to the inner zone of altered shear zone and are dependant on the intensity of deformation. SEM and mineralography studies indicate occurrence of sulfide mieralization especially Au sulfides which appeare in two generations. On the base of SEM studies, little Ag and As are observed. There is no gold in calcite. Primary mineral consist of: pyrite, marcazite and calchopyrite, and secondary minerals are pyrite, coveline and realgar. In addition, various pyrites occur as primary and secondary phase mineral. SEM study shows sense of gold in sulfide mineral. On the other hand, fluid inclusion studies shows 350oC temperature in gold formation. Low salinity which shows probably that gold is not carried by chloridric complex in this stage. Daughter mineral in fluid inclusion shown low Cl.Conclusion: Based on present evidence, and comparison with other gold type in the world, gold mineralization type is similar to gold orogenic type. Evidence like Parageneses, elements, gangue and alteration around mineralization area all indicate the presence of monometal gold vein ore deposit of shear zone origin replaced by gold vein in cracks which are depended on this structure. Formation and occurrence gold field are influenced by structural properties and tectonic turnover and kind of hosted rock.

In the western part of the Sistan & Baluchestan Province (continuation of the Jebal- e Barez Range) in southeast Iran, the epithermal type (i. e. gold and associated elements) model is one of the anticipated metallogenic model. The studied area is one of the important targets of regional geochemical exploration. In this regard, the mineral and geochemical geological map of 1/20000 was prepared in an area of 81 km2. After processing of the data and identifying the ore zones, 30 trenches drilled perpendicular to the veins and one sample was taken in every 5 meters. The results show that a tectonomagmatic event and large scale fracturing with strike of N30E led the hydrothermal solutions and caused an extensive alteration. This alteration caused a regional propylitization in andesites and development of a large argillic-silicious alteration in associated lavas and pyroclastics followed by formation of the thin silicious veins in strike of N30E with chalcedony, colloform, cockade and vesicular structures, having the quartz adularia par agenesis and are assumed to be the sources of gold genesis and the main phase of gold formation.

The gold mineralization in Kurdistan Province of Iran was classified as shear zone gold type by some of the researchers. In the current study, the geochemical samples collected from the secondary environment, stream sediments, at the SW of Saqquez area were used to investigate the geochemical characteristics of the gold mineralized zones in this environment. The multi-variant statistical analysis, cluster analysis, was used to identify the gold paragenesis. The cluster analysis was led to identify the geochemical paragenesis of Au, which is W, Bi, Sn, and Hg. Hg, and Sb haloes are extended in un-mineralized area. As element, which is an important paragenesis in many gold deposits, was used instead of Hg in this investigation. The anomaly areas for each element were determined based on the probability plot modeling method. The spatial dispersion haloes of the anomaly areas, as 2D map, were identified based on the modeling of probability plot results. The results of interpretations were shown that Sn, W and Bi were highly correlated with Au in the study area. Element of as did not show an important correlation and anomalous area in this environment.These characteristics show a very high correlation to the primary dispersion haloes of shear zone gold deposits in the other part of the world. Based on these similarities of the behaviors, the other geochemical exploration patterns in the primary environments might be used for the Kurdistan mineralized areas to prioritize the anomalous area for follow up exploration.