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

R. S. Seryy, Senior Researcher, e-mail: Ruslan_ssr@mail.ru
V. S. Alekseev, Senior Researcher
P. P. Sas, Researcher

Gold extraction is one of the most important issues during the placer deposit mastering, which make a huge influence on economic indicators of the enterprise in whole. In spite of the presence of jiggery machinery, centrifugal concentrators and spiral separators, the sluice complexes are still the main concentration washing units. Assessment of sluice washing units operation may define a range of the basic reasons of metal loss: the quality of return water, used for sand washing; high content of clayey particles in initial sands; presence of accompanying heavy metals; gold morphology; constructive parameters of concentration equipment. Interaction between the losses of metal with lixiviation fractions and gold output on shallow sluices was observed for sluice washing units PGSh-50 (ПГШ-50) with deep and shallow sluices. The carried out investigations showed the increasing of concentration of clayey particles in return water, which leads to the considerable growth of gold losses from sluices. Dependence of gold distribution in shallow sluice concentrates (from the first to the last) was obtained, and helped to carry out the extrapolation assessment of gold screening efficiency, and the amount of losses in deep sluices. The research allowed to analyze the gold losses at the shallow and deep sluices, establish their causes and make recommendations for elimination. The research results were taken into account in the modernization of the flushing device PGSh-50, which will significantly reduce the loss of fine and thin gold sluices of fine filling.

1. Khrustalev E. Review of Russian gold-mining branch for 2013–2014. Zoloto i tekhnologiya. 2015. No. 2 (28). pp. 20–24.
2. Litvintsev V. S. Resource potential of placer mining waste. Fizikotekhnicheskie problemy razrabotki poleznykh iskopaemykh. 2013. No. 1. pp. 97–104.
3. Mirzekhanov G. S., Mirzekhanova Z. G. Resource potential of anthropogenic formations of gold placer deposits. Moscow : MAKS Press, 2013. 288 p.
4. MacFarlane K. E., Nordling M. G. Yukon Exploration and Geology Overview 2013. Whitehorse, Canada (Yukon Geological Survey), 2014. 80 p.
5. LeBarge W. P., Nordling M. G. Yukon Placer Mining Industry 2007–2009. Whitehorse, Canada (Yukon Geological Survey), 2011. 151 p.
6. Van Loon S., Bond J. D. Yukon Placer Mining Industry Report 2010–2014. Whitehorse, Canada (Yukon Geological Survey), 2014. 230 p.
7. V. S. Litvintsev. Effective methods for gold recovery from mining wastes at placers. Fiziko-tekhnicheskie problemy razrabotki poleznykh iskopaemykh. 2012. No. 1. pp. 190–194.
8. Litvintsev V. S. Basic directions of the strategy of mastering of anthropogenic ore and placer deposits of noble metals. Eurasian mining. 2014. No. 1. pp. 7–11.
9. Instruction for regulation of technological losses of gold during the washing of gold-bearing sands in washing units. Magadan : Kordis, 2004.
10. Zamyatin O. V., Kavchik B. K. Calculation of gold losses with lixiviations of washing tools according to the screen analysis data. Zolotodobycha. 2008. No. 2 (111). 16 p.
11. Fomenko T. G. Gravitation processes of mineral concentration. Moscow : Nedra, 1966. 332 p.
12. Seryy R. S. Gold losses decrease in sluice washing devices during the development of difficult alluvial deposits. Marksheyderiya i nedropolzovanie. 2014. No. 6 (74). pp. 20–22.
13. Sas P. P. Experimental investigations of placer gold losses on ПГШ-II-50 tool (PGSh-II-50). Zolotodobycha. 2014. No. 10 (191). pp. 18–21.
14. Vaysberg L. A., Kartavyy A. N., Korovnikov A. N. Screening surfaces of screens. Saint Petersburg : VSEGEI, 2005. 252 p.
15. Seryy R. S. Drag carpet. Patent RF, No. 129428, IPC V 03 V 5/70. Applied: 10.12.2012. Published: 27.06.2013. Bulletin No. 18.
16. Seryy R. S., Alekseev V. S., Sas P. P. Assessment of efficiency of operation of sluice washing units during the fine and disk-shaped gold deposit mining. Zoloto i tekhnologiya. 2015. No. 1 (27). pp. 104–107.