V. Alizadeh; M. Momenzadeh; M. H. Emami
Abstract
Based on Qayen 1:100000 geological map, the copper mineralization of Vorezg in volcanic rocks is attributed to Paleocene-Lower Eocene. Submarine volcanic rocks of the study area are found in two forms of lava and pyroclastics. Based on field and laboratory investigations, the outcropped rocks in Vorezg ...
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Based on Qayen 1:100000 geological map, the copper mineralization of Vorezg in volcanic rocks is attributed to Paleocene-Lower Eocene. Submarine volcanic rocks of the study area are found in two forms of lava and pyroclastics. Based on field and laboratory investigations, the outcropped rocks in Vorezg deposit are andesite, andesite – basalt, basalt and several small exposures of pyroclastic rocks such as tuff. Alkaline volcanic rocks of the area show within plate characteristics. Texture of mineralization is vein-veinlet, disseminated and open space filling amygdales. According to the mineralography studies, main minerals of copper are chalcocite, β-chalcocite, bornite, covellite, digenite and rare native copper. Chalcocite is the most abundant mineral. Intergrowth among copper ores is observed in most cases. Silver was detected as accessory phase (copper element paragenesis) in this ore deposit. Whereas silver has not founded an independent crystalline phase, therefore in the crystal of chalcocite, copper was replaced by Ag. Fluid inclusion studies on trapped fluids in quartz show homogenization temperature average is 230-250 ºC and salinity degree of fluids is 5-6%wt NaCl. On the basis of recognized characteristics, Vorezg ore deposit is comparable with Manto and Volcanic redbed type copper deposits. Recently, these two types of deposits are considered as synonyms.
M. Abdollahy; S. M. J. Koleini; A. Ghaffari
Abstract
Cyanidation process is one of the most important and widespread hydrometallurgical technologies used in the extraction of gold and silver from ores and concentrates. Some of the most effective parameters on cyanide leaching are sodium cyanide concentration, dissolved oxygen, solid percent, pH, particle ...
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Cyanidation process is one of the most important and widespread hydrometallurgical technologies used in the extraction of gold and silver from ores and concentrates. Some of the most effective parameters on cyanide leaching are sodium cyanide concentration, dissolved oxygen, solid percent, pH, particle size, retention time and agitation speed. In this article the effect of these parameters on the recovery of gold, silver and mercury from Pouya Zarkan Aghdareh ore has been studied to determine the optimum conditions using Taguchi exprimental design method. The experiments at the screening step based on L16 orthogonal array indicated that the effective parameters on gold, silver and mercury recovery such as sodium cyanide, pH, solid percent in pulp, d80 and retention time were obtained equal to 900 g/t ore, 10, 42%, 53 μm and 30 h, respectively. The experiments at the optimization step based on L18 orthogonal array indicated that d80 on gold recovery and retention time on silver and mercury recovery were the most effective parameters. Finally the optimum conditions for gold, silver and mercury recovery were obtained for parameters such as sodium cyanide, pH, solid percent in pulp, d80 and retention time equal to 1000 g/t ore, 10.3, 46%, 37 μm and 40 h, respectively. At this conditions gold, silver and mercury recovery were equal to 91.42±1.02, 54.31±1.24 and 19.50±0.66 percent, respectively.
