Mineralization of Copper & Silver in Jaroo area, Karaj

Subject Areas :

Shiva Shahsavar ¹ (دانشجوی کارشناسی ارشد، گروه زمین شناسی، دانشگاه آزاد واحد علوم و تحقیقات)
Mohammad Yazdi ² (دانشیار، دانشکده علوم زمین، دانشگاه شهید بهشتی)
Mohammad Foudazi ³ (استادیار، گروه زمین شناسی، دانشگاه آزاد واحد اسلامشهر)
Hadi Golzar ⁴ (کارشن اسارشد زمین شناسی اقتصادی، شرکت مجتمع نگین معادن احیاء سپاهان)

Received: 2016-09-04 Accepted : 2016-09-04 Published : 2016-08-22

Keywords: Copper, Mineralization, Silver, Jaroo, Karaj,

Abstract :

The study area is located 59km southwest of Karaj City, in northern slopes of Mt. Jaroo. From structuralsedimentary classification point of view, the area is a small part of Orumiyeh-Dokhtar volcanic belt and frommetallogenic viewpoint; it is western part of copper-gold zone of Saveh-Kashan-Naein. The basement rocks ofthe area are mostly lithic tuffs, andesite, dacite and diorite. Dacite to andesites are the main host rock ofmineralization. According to the field studies and drilling observation, the mineralization is vein and open-spacefilling types and it is following local faults trends. Mineralization having east-west trend has less than 1200mlength and 200m width. Its thickness (thickness of veins) reaches up to 1 to 2m. The mineralogical studies showthat malachite and azurite are observed in surficial parts of the area while chalcopyrite, chalcocite, bornite andcovellite are found at depth. The geochemical analysis of about 40 samples (outcrop and drilling) shows thatanomaly for Cu, Ag, Pb, Zn and Au. Respectively, the anomaly for Cu and Ag are too high while average gradesare for Cu about 5% and for Ag about 225 ppm. It is conclude that the Jaroo area can be considered as a smallcopper and silver deposit.