Mineralization of Copper & Silver in Jaroo area, Karaj

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 from metallogenic viewpoint; it is western part of copper-gold zone of Saveh-Kashan-Naein. The basement rocks of the area are mostly lithic tuffs, andesite, dacite and diorite. Dacite to andesites are the main host rock of mineralization. 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 1200m length and 200m width. Its thickness (thickness of veins) reaches up to 1 to 2m. The mineralogical studies show that malachite and azurite are observed in surficial parts of the area while chalcopyrite, chalcocite, bornite and covellite are found at depth. The geochemical analysis of about 40 samples (outcrop and drilling) shows that anomaly for Cu, Ag, Pb, Zn and Au. Respectively, the anomaly for Cu and Ag are too high while average grades are for Cu about 5% and for Ag about 225 ppm. It is conclude that the Jaroo area can be considered as a small copper and silver deposit.