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DEVELOPMENT OF DEPOSITS
ArticleName Improvement of high clay placer mining in the Far East of Russia
DOI 10.17580/gzh.2018.10.07
ArticleAuthor Khrunina N. P.
ArticleAuthorData

Institute of Mining, Far East Branch, Russian Academy of Sciences, Khabarovsk, Russia:

N. P. Khrunina, Senior Researcher, Candidate of Engineering Sciences, npetx@mail.ru

Abstract

High clay sands of placers of the Fadeev gold ore cluster in Primorye are studied. It is emphasized that capacities and equipment of local gold mines fail to ensure efficient pre-treatment of high clay sand before the recovery of fine and very fine gold. Disintegration ability of sands is estimated by means of the phase analysis of specimens, structural and mechanical properties of sand are tested, as well as the components, density, moisture content and ultrasonic velocity are determined. It is found that environment pollution and the requirement of complete mineral extraction from the subsoil, the presence of fine and very fine highgrade minerals and montmorillonite-type clayey minerals, which form difficult-to-break structural bonds, as well as the dominating content of ferrous compounds in the test specimens call for the unconventional approaches to deep disintegration of high clay sand, including cavitating type. A modular movable elevatedtype technological system and a cavitation-type hydrodynamic generator are proposed for the practical use. Pre-treatment of placer sand by cavitation and hydrodynamic effects will reduce loss of noble metals from multi-component hydro-mixtures and will improve technological and ecological efficiency of production.

keywords Disintegration, fine particle extraction, high-grade components, phase analysis, cavitaion plant
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