Navoi Mining and Metallurgy Plant, Navoi, Uzbekistan:

K. S. Sanakulov, Director, Doctor of Engineering Sciences

IVS Joint Venture, Saint-Petersburg, Russia:
A. V. Zimin, Chief Executive Offi cer, Candidate of Engineering Sciences
M. A. Arustamyan, Chief Operating Offi cer, Candidate of Engineering Sciences
S. P. Nagaeva, Head of Mineralogy Research Laboratory, SPNag@yandex.ru

Kokpatas and Daugyztau are the large gold ore deposits in the Republic of Uzbekistan. Local gold is rebellious and finely disseminated. The current beneficiation technology involves flotation, biological and hydrometallurgy methods. In order to study dressability resistance of sulfide flotation concentrate and bio-oxidized flotation concentrate, Navoi Mining and Metallurgy Plant and IVS undertook joint analysis of material constitution of the concentrates. It is found that the sulfide concentrate meant for bio-oxidation enjoys good dissociation of minerals. After bio-oxidation considerable amount of gold remains associated with sulfide and may be lost at further process stages. Also, bio-oxidation can generate different organic and inorganic acids and their salts, which dissolve gold and silver.

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