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

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

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.

1. Kozlovsky E. A. Natural resources in the economy of Russia and in the world. Gornyi Zhurnal. 2015. No. 7. pp. 47–53. DOI: 10.17580/gzh.2015.07.07
2. Voronkina D. V. Mineral resources of Russia against the background of economic growth and consumption problems. Current Matters of Development and Modernization of the Global and Russian Economy: Collection of Scientific Papers. Kursk : Universitetskaya kniga, 2016. pp. 85–89.
3. Ganin D. R., Druzhkov V. G., Panychev A. A., Bersenev I. S. Microstructure and mineralogical composition of agglomerates in use of additives of brown ironstone ores, bentonite clays and serpentinite-magnesites. Chernye Metally. 2018. No. 5. pp. 10–14.
4. State balance of mineral reserves in Russian Federation for the 1^st of January 2015. Iss. 29. Gold. Moscow : Rosgeolfond, 2015.
5. Goryachev N. A., Pirajno F. Gold deposits and gold metallogeny of Far East Russia. Ore Geology Reviews. 2014. No. 59. pp. 123–151.
6. Voroshin S. V., Tyukova E. E., Newberry R. J., Layer P. W. Orogenic gold and rare metal deposits of the Upper Kolyma District, Northeastern Russia: Relation to igneous rocks, timing, and metal assemblages. Ore Geology Reviews. 2014. Vol. 62. pp. 1–24.
7. Wang Chenghui, Xu Jue, Huang Fan. Resources Characteristics and outline of regional metallogeny of Gold deposits in China. Acta Geological Sinica. 2014. Vol. 88, No. 12. pp. 2315–2325.
8. Omang B. O., Suh C. E., Lehmann B., Vishiti A., Chombong N. N. et al. Microchemical signature of alluvial gold from two contrasting terrains in Cameroon. Journal of African Earth Sciences. 2015. Vol. 112. pp. 1–14.
9. Adams M. D. Gold Ore Processing: Project Development and Operations. 2^nd ed. Amsterdam : Elsevier, 2016. 980 p.
10. Arkhipov G. I. Mineral Resources of the Mining Industry in the Russian Far East. Strategic Estimation of Minability. Khabarovsk : IGD DVO RAN, 2018. 820 p.
11. Khrunina N. P., Cheban A. Yu. Substantiation of the hydrodynamic disintegration of hydraulic fluid’s mineral component of high-clay sand in precious metals placers. Georesources. 2018. Vol. 20, Iss. 1. pp. 51–56.
12. Rukovich A. V., Rochev V. F. Disintegration of frozen clay rocks under the influence of chemical fields and the aquatic environment. Advances in Current Natural Sciences. 2017. Iss. 5. pp. 123–127.
13. Cui Z., Li Y., Ge Y., Fan L. S. Bubble modulation using acoustic standing waves in a bubbling system. Chemical Engineering Sciences. 2005. Vol. 60, Iss. 22. pp. 5971–5981.
14. Gilmanov A., Sotiropoulos F. A hybrid Cartesian/immersed boundary method for simulating flows with 3D, geometrically complex, moving bodies. Journal of Computational Physics. 2005. Vol. 207, Iss. 2. pp. 457–492.
15. Zhou J., Jago B., Martin C. Establishing the Process Mineralogy of Gold Ores. Technical Bulletin. 2004. No. 3. 16 р.
16. Kislyakov V. E., Nikitin A. V. Preparation of loam sand of placer deposits to scrubbing by observation water saturation. Gornyi Zhurnal. 2010. No. 2. pp. 28–30.
17. Lushpei V. P., Petrakov A. E. Ways of handling the fine-dispersed gold recovery problems. Development Problems of Geo-Resources in the Far East of Russia. Moscow : Gornaya kniga, 2013. Iss. 4. pp. 87–91.
18. Kislyakov V. E. Limits the contamination of process water in the development of placer deposits gold. Izvestiya Tulskogo gosudarstvennogo universiteta. Nauki o Zemle. 2017. No. 3. pp. 148–156.
19. Nikitin A. V., Kislyakov V. E. Research Results of Velocity and Range of Clay Sends Water-Saturating before the Concentration on the Gravel Deposits. Journal of Siberian Federal University. Engineering & Technologies. 2009. Vol. 2, No. 4. pp. 359–367.
20. Kurlenya M. V., Vostretsov A. G., Kulakov G. I., Yakovitskaya G. Ye. On the structure of electromagnetic radiation signals and their association with acts of rock-specimen failure. Journal of Mining Science. 2000. Vol. 36, Iss. 1. pp. 1–7.
21. Khrunina N. P., Mamaev J. A., Litvintsev V. S., Sekisov G. V. Geotechnological complex for gold dredging and placer mining. Patent RF, No. 2325531. Applied: 25.12.2006. Published: 27.05.2008. Bulletin No. 15.
22. Khrunina N. P. Method of cavitation-hydrodynamic disintegration of hydraulic mixture mineral component. Patent RF, No. 2634148. Applied: 04.10.2016. Published: 24.10.2017. Bulletin No. 30.