Abstract
PURPOSE. Today the development of an efficient technology of refractory ore processing is quite problematic, therefore the achievement of high degree of gold recovery is a relevant problem. The purpose of the research includes investigation of mineral and chemical composition of the gold-bearing ore of the Taror deposit, performance of the series of tests on ultrafine grinding (UFG) of ore prior to cyanidation and pulp processing after UFG by the method of atmospheric oxidation followed by cyanidation, study of the ground particle size effect on the degree of Au recovery under conventional cyanidation and search for an alternative technology of gold recovery from refractory gold-bearing ores. METHODS. Diffractometric and quantitative methods are applied to analyze the mineralogical composition of the ore. Optical emission, atomic absorption, phase, IR-spectroscopic, gravimetric, titrimetric and photometric methods are used to study the chemical composition of the sample. Gold and silver contents are defined using direct fire assays. RESULTS AND THEIR DISCUSSION. The obtained results have shown that the Taror ores refer to refractory ore type. It means that traditional cyanidation method without application of any additional process operations fails to present any acceptable results on gold recovery. Application of the UFG method followed by atmospheric oxidation has increased gold recovery by 7.33% for this type of ore. CONCLUSION. Application of UFG followed by atmospheric oxidation enables efficient processing of refractory ores, which was considered earlier economically unviable. It is planned to study this type of ore further by flotation concentration methods, carry out a series of tests on flotation concentrate UFG and atmospheric oxidation of ultrafine ground pulp with the following cyanidation in the sorption mode.
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