Reassessment of abandoned mines and mineral indications in the Anarak area, volume 6: Jamni deposit
Cu and polymetal Anarak deposits are located at the northern side of the Esfahan Province. These deposits have a long history of exploitation. Old workings and smelting slag are distributed across Central Iran Great Desert from Dom Mountain (Qermez Cu-Au mine) to Doshakh Mountain (Chahpalang Au-W-Cu mine). Also there are remnants of traditional furnaces in the abandoned mines of the area showing the age of mines. What preserved so far, going back to the last period of exploitation by German experts at 1945, end of Second World War.
The Jamni mine is not known by this name in the local community of the area. But it is known as Khuni mine. However we found the true location of it by GPS using the archive of National Iranian Copper Industries Co.
The deposit has occurred in Anarak-Khur massif, in contact of Proterozoic schists with igneous intrusion influenced by Alpine orogeny. The deposit contains copper and gold. It is located at 33 26 35 northern latitude and 54 13 40 eastern longitude, south of Khuni mine and Kashki mountain. The mineralized area is 40 hectares wide. The area shows evidence of metasomatism, argillic, silicic, and pyrophillitic alterations.
Mineralization has occurred in fault zones that include molybdenite, chalcopyrite, gold and etc. dominant ore minerals are of copper and gold. The grades of gold, silver and molybdenum in veins range between 50 and 200 milligrams per ton; 6 and 18 grams per ton and 2 to 80 grams per ton respectively. The copper grade is between 0.5 and 3.12% mainly as chalcopyrite.
Metasomatism in the area is in relation to Eocene tectono-magmatism. Albitization and serpentinization of ultrabasic rocks and listvenitization of aluminosilicate rocks, hydrothermal alteration of metamorphic, igneous and clastic rocks, are dominant in the region. Additionally, sericitization and chloritization are evident in plagioclases and mafic minerals, respectively.
There are several small intrusions in the region that all of them show albitization alteration. Middle-upper Eocene Sahlab conglomerate that the oldest clastic rock in the area contains pebbles of albitized granites. This unit itself has a listvenitic appearance.