طرح اکتشاف طلا در استانهای خراسان و سمنان (از طرح تا تولید)

The Eocene Volcano Sedimentary belt are widespread on the northern sides of the grale Kavir and Doronen faults. Which have been intersected by several Granitoid plutons Oligocene time. Several large and exceeding gold anomalies as well as old gold mines such as Kon-o-zar Damghan and Kashmarand are associated with and late stage hydrothermal activities of the late Oligocene magmatism.

During the regional geochemical stream sediement exploration several large and small gold and paragenetic anomalies have been identitied.

Based on the results of the regional geochemical exploration which covers more than ۷۰۰۰۰ (Km) area in northeast Iran. Some of the indicated gold anomalies have been covered by semidetailed and detailed geochemical and geological exploration project since ۱۹۹۶.

The gold exploration in ۲ different locations such as Argnash in Khorasan and Ganding in Somnan provinces have been more developed up to the follow up exploration stage.

Some gold and paragenetic element anomalies are associated with outcropped quartz and calcite vein deposits high concentration anomalies of As. Sb. Hg. Bi. Ag are existed within the alteration zones of silicitication and kaolinization which indicated as hydrothermal gold 

vein deposit ever several tens of Km

Later in ۱۹۹۹ a follow up exploration program has been carried out by digging ۳۸ trenches over the quartz-calcite vein zone, Generally . the Au grade increases up to ۲۴ gr/t at depth of ۱۰ m along some trcnches, Drilling network designed in late ۱۹۹۹ and during ۲۰۰۰. More than ۱۴۰۰ m drilling has been completed. The results of drilling project indicates a gradually increasing mineralization zone down to ۱۶۰ m (the first stage of drilling project) and the Au grade varies from few grams up to ۸۲ gr/t at ۱۰۶ m depth in borehole No ZK۲۸۰۲.

Simultaneously the follow up exploration. A pilot test plant to extract gold has been completed in late ۲۰۰۰. About ۷۰ grams of gold has been extracted from ۳۵ tonnes of ore. With average grade of ۶ gr/t. but due to some technical reasons the recovery rate was too low