Preliminary exploration project of the Khur and Zirvaght manganese deposits (Central Khorasan)
Final report of Zirvaght exploration
The report is a compilation of exploration works on the Zirvaght deposit including the geology maps (1:1000; 1:5000) of Zirvaght, Khur and Band-e Qara, geophysical exploration report for gravimetry and magnetometry and the result of field investigations, trenching, drilling and sampling. Zirvaght deposit is located 35 km away from the northeast of the Bardeskan. The area is part of the Taknar structural zone and is located along the Kasb-Kuh Sorkh fault. The deposit has occurred in the Upper Cretaceous volcano-sedimentary assemblage of Torbat-e Heydariyeh ophiolites. Low grade manganese ore exists in the radiolarites that concentrated by secondary tectonic processes in the veins and lenses that is 0.5 km long and 50m wide. There are more than 40 lenses in various sizes in the deposit. Based on four drilled holes, the lenses are shallow depth. Source of manganese is sedimentary concentration of manganese released during marine volcanism in the radiolarite rocks. Absolute reserve of deposit is 82000 tons ore with 25% MnO that includes 17000 tons MnO 40%. The main problem of deposit is the silicate host rock that can produce silica during processing. The current project unraveled the feature of deposit.