Navoi Mining and Metallurgical Combinat, Navoi, Republic of Uzbekistan:

K. Sanakulov, General Director, Doctor of Technical Sciences, Professor, e-mail: info@ngmk.uz
I. O. Khamroev, Deputy Chief Geologist, Candidate of Geological and Mineralogical Sciences

What are the prospects for development of the mineral resource base of processing complexes in the world, in addition to the traditional discovery and development of new gold deposits? The practice of development of gold ore deposits shows that along with macro- and micro-gold in ores there is gold of high dispersion up to nanoscale size. The possibility of its extraction by upto-day technologies is limited. The extreme fineness and complexity of forms of gold presence create significant difficulties in analytical determination and development of technologies for their extraction. The concept of the metallurgical approach to extraction of non-recoverable nanogold in the processing of gold-bearing ores requires consideration of the inseparable chain of geology, mining and metallurgy. Chemical transformations accompany gold in the first and third stages. The development of advanced technology for extraction of ultrafine nanogold should be conducted from nanogeochemistry and nanomineralogy to nanometallurgy. It was found that melting temperatures during heat treatment of fine nanogold in gold-bearing ores on different genetic types (low-, medium-, high-temperature hydrothermal, gold-scarn) are different, and the thermal effect magnitude is proportional to the formation temperature. Factors of technological complexity of low extraction of dispersed gold during cyanidation are determined. Typing of ores according to geological and technological properties of exploited deposits of Uzbekistan with ultrafine (nano) gold has been carried out. The classification of natural gold with nanogold aggregation, modern and possible methods of separation of primary gold were developed.

1. Evans L., Collins S. E., Cox J. J., Krutzelmann H. Technical report on the Goldstrike mine, Eureca and Elco counties, Nevada USA. № 43-101 Report. Toronto, on Canada. April 25, 2017. 212 p.
2. Petrovskaya N. V. Native gold. Moscow : Nauka, 1973. 218 p.
3. Shumilova L. V. Geological and technological classification of gold-bearing ores with dispersed forms of metal. Gorny informatsionny analiticheskiy byulleten. 2009. No. 4. pp. 215–219.
4. Novgorodova М. I. Nanocrystals of native gold and their intergrowth. Novye dannye o mineralakh. 2004. Iss. 39. pp. 83–93.
5. Koneev R. I. Nanomineralogy of gold of epitermal deposits of Chatkal-Kuramin region (Uzbekistan). Saint-Petersburg, 2006. 127 p.
6. Matvienko V. N., Nenakhov V. М., Kalashnikov Yu. D., Levin V. L. The role of precious metals natural clusters as a source of ore in formation of deposits. Vestnki VGU. Seriya: Geologiya. 2018. No. 3. pp. 36–49.
7. Hanszen K.-J. Theoretische untersuchungen uber den schmelzpunkt kleiner kugelchen. Ztschr. Phys. Bd. 1960. Vol. 157. No. 5. pp. 523–553.
8. Osovetskiy B. М. Natural nanogold: monograph. Perm, 2013. 175 p.
9. Meretukov М. А., Sanakulov К. S., Zimina А. V., Arastumyan М. А. Gold: chemistry for metallurgists and concentrators. Moscow : “Ore & Metals” Publishing house, 2014. 387 p.
10. Gimeno M., Laguna A. Comprehensive coordination chemistry. ed. Mc. Cleverty, T. Meyer. N.Y. : Elsevier, 2009. pp. 911–1145.
11. Askhabov А. М., Yushkin I. P. Quaternary mechanism of nanostructures genesis. Micro- and nanodisperse structures of mineral matter. Syktyvkar : Geoprint, 1999. pp. 28–33.
12. Byvaltsev А. V. Features of processing of sorption-active carbonaceous gold-bearing ores. Zolotodobycha. 2019. No. 3 (244). pp. 18–23.
13. Sanakulov К. S., Khamroev I. О. Study of the influence of natural types of orebearing rocks with dispersed gold and organic carbon on gold recovery at the Kokpatas and Daugyztau deposits. Gorny vestnik Uzbekistana. 2015. No. 3. pp. 7–11.
14. Sanakulov К. S., Vorobyev А. Е., Norov Yu. D. The beginning of industrial application of nanotechnology in subsoil use. Tashkent : Izd. “FAN” AN RUZ, 2017. 493 p.
15. Bektay Е. К., Turysbekova G. S., Meretukov М. А., Bektaev М. Е. Natural nanoparticles and nanostructures. Almaty, 2018. 600 p.
16. Matushkina А. N. Development and testing of processes for preparation and enrichment of products containing fine gold. Dissertation … of Candidate of Engineering Sciences. Yekaterinburg, 2016.
17. Reich M., Utsunomia S., Kesler S. E. , Wang L. et al. Thermal behavior of metal nanoparticles in geologic materials. Geology. 2006. Vol. 34. pp. 1033–1036.
18. Khamroev I. О. Features of localization of industrial concentrations of Amantaitau deposit gold ore formations. Gorny vestnik Uzbekistana. 2019. No. 2. pp. 20–24.