Reassessment of abandoned and inactive copper mines in the Anarak region, volume 5: Talhe Deposit
Naien Mines Development Company
Talhe is a vein-type deposit formed in the Proterozoic crystallized limestone of Lakh. It has occurred as calcite-barite filled veins in 16 distinct zones that dip 65 degrees toward north. Talhe deposit is located 21 Km away from west of Anarak, between 53 35' E and 32 20' 08" N, at south of the Darreh Anjir Mountains.
This mine was exploited from ancient times. The mineralized portion of the metamorphosed Lakh limestone in the area is 1 square kilometer. There are four tunnels, nine trenches and an open-pit front in the mine.
The Lakh marble itself is a thrust sheet within the Anarak metamorphic complex. Talhe deposit is hydrothermal to telethermal Cu-Mo deposit related to the Oligocene magmatism.
To determine the grade and ore minerals in the deposit, sampling was done from tunnels and trenches. The study shows that malachite, chalcocite, covelite, and valernite are dominant ore minerals. All fractured zones have mineralization. Most intensive mineralization has occurred in the northern portion of deposit in the trench 8 and open-pit front near tunnel 4 that is stockwork and vein structure. The mineralized zone is 13 m wide.
A large part of deposit has extracted by underground method, but there are more reserve to be extracted. Estimated depth of deposit is 100 m and its area 1000 m2. Average grades of copper, silver and molybdenum are 2.28%, 12.73ppm and 2.13% respectively. In the lower portion, the low-grade zone was not still exploited. From tunnel 6 to up, the zone has more than 1% copper. The Au grade is unknown, but nickel and cobalt also exist in the deposit that is related to the ophiolite systems.