Final report of semi-detailed exploration in the Shurab Mercury Deposit, Kashmar
Executive: Eng. Ahmadi
Supervisor: Eng. Abbasnia
By: Kawosh-Kansar Consulting Engineers
At 1988, by observation of mercury in a stream and water channel of Shurab Village of Kashmar County, in the Khorasan Province, attention paid to the mercury mineralization. After the event, efforts started for mercury exploration of which includes investigations by TOSCO, experts of GSI, experts from Czechoslovakia, Canada and Azarbaijan. Then, the Kawosh-Kansar Consulting Engineers started the exploration by geochemical sampling using the mercurymeter on the scales 1:5000 and 1:1000 at 2000. This step was led to identification of several anomalies on which semi-detailed exploration executed.
On the base of previous information, six boreholes drilled that totally are 350m long. Several small holes were also drilled for complementing the work. New field visits and assessments modified the previous ideas.
In this zone, a series of black, red and grey slate and meta-sandstone rocks exposed showing green schist grade of metamorphism. Due to dehydration and silica deposition in the fractures and veins, there are a large number of metamorphic silica veins having quantities of iron and manganese oxides with rare pyrite mineralization. These veins have no considerable mineral. Assessment of cores, XRF, XRD, thin and polished sections also confirmed that mercury mineralization in the area is rare. Despite the observation of mercury and anomalies shown by geochemical study, so far, there is no evidence of mercury mineralization in the area. In other side, we can't negligible the former observations. Geological evidence lighten the possibility of mercury mineralization in the area, so the method of assessment should be changed.