جستجوی مقالات مرتبط با کلیدواژه « طلا و نقره » در نشریات گروه « زمین شناسی »

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.

Based on this study, the avcfiige gold and silver graJcs in the SaT Chesbmeh porphyry copper deposil arc 0.06 and 1.22 gil re.chr('39')ipcct ivcly which arc very different from the o nes repon ed previously. In the bioti lic andes ite and a!ICrcd phyllic/potassic samples from the siock, the high positin: correlation between the hypogene copper and gold grades ( r=0.81 ), and gold chr('39')lIld silw.f grades (1"=0.6 1), and gold and si lver with the hypogene copper grade (r;:::U.72), indicatc:( I) the contemporaneous deposition of C(lpper, gold ami silver, <lnd (2) gold is probably prescnt in the form of exsolution, invisihle solid solution and nalive or elect rum within the chalcopyri te gwins. Within the secondary sulfide enrichment zone, the gold grade is two times more than the hypogene grade, Silver also indicates the highest concentration within the lellched/oxidc and secondary sulfide enrichment w nes. This st udy indicm(:s th ~l t the Sar Chcshmeh deposit is a gold and silver poor porphyry COPP!;;I - molybdenum deposit.

Geological and geochcmical studies in Sinar area, located in the north east of Khonlsan pruvince, indicate the presence of antimony in a vast area. This cleme nt mainly occurs as st ihni te , associated wi th na tive antimony, kerlncsite, getchellite (chr('39')!), pyrite, chalw pyrite. arseno pyrite, tctrahcdrite .md ga lena, in carbonate rock.chr('39')i, as veins. veinlcts and disseminations. The gangue minerals arc calcilc,doiomitc, barite and qua rtt. Inves tiga tions ind ica te that thrust fllulis and brecciated zones arc the most important channclways for migration or arc tluids, and deposi tion of the a re assemblage and The mineralization has occurred in seve ral physico. chcmic<l1 e pisodes. The strategic importance of antimony, and its association with valu<lble commodities such as gold, si lver, mercury and arsen ic, demand more detail inves tigat io ns in this region.