Article
Article name Mineralogical and Geochemical Features of the Gold-Containing Ores of the Pakrut Deposit (Central Tajikistan) As the Basis of Gravity Enrichment
Authors Kholov K.I. Candidate of Technical Sciences, Senior Researcher, Kholmahmad90@mail.ru
Niyozov A.S. Candidate of Geological and Mineralogical Sciences, Associate Professor, Mining and Technical Management department, aniyozov@bk.ru
Juraqulov S.R. Applicant for Scientific Degree, Sherzod_89@mail.ru
Samikhov S.R. Doctor of Technical Sciences, Leading Researcher, samikhov72@mail.ru
Bibliographic description Kholov Kh. I., Niyozov A. S., Juraqulov Sh. R., Samikhov Sh. R. Mineralogical and Geochemical Features of the Gold-Containing Ores of the Pakrut Deposit (Central Tajikistan) as the Basis of Gravity Enrichment // Transbaikal State University Journal. 2024. Vol. 30, no. 2. P. 82–92. DOI: 10.21209/2227-9245-2024-30-2-82-92.
Category Subsoil Use, Mining Sciences
DOI 54.06:669.213.1
DOI 10.21209/2227-9245-2024-30-2-82-92
Article type
Annotation The mining sector, in particular gold mining, plays an important role in the economy of Tajikistan. Today, the issue of optimizing gold mining mechanisms, increasing its efficiency and expanding the resource base is of topical importance. The depletion of easily accessible gold deposits is stimulating the development of methods for extracting gold from refractory and low-grade ores. One of the promising methods of pre-treatment of such ores is gravity enrichment. The aim of the study is to characterize the Pakrut gold deposit, to determine its mineralogical and chemical composition, and to develop an optimal gravity enrichment scheme for gold recovery. Research objectives are as follows: to study the mineralogical composition and geochemical characteristics of gold-bearing ores, and then to develop a technique for their gravitational enrichment. The object of the study is the gold-bearing ores of the Pakrut deposit (Central Tajikistan). Materials and methods of research: analytical work and enrichment in laboratory conditions were carried out in the chemical laboratory of the Pakrut Joint Venture, the ore enrichment laboratory of the V. I. Nikitin Institute of Chemistry of NANT, the Central Committee of the Main Geological Directorate under the Government of the Republic of Tajikistan. It is found that gold in the Pakrut ores is mainly represented by native gold and electrum. The main gold-bearing minerals are pyrite, arsenopyrite, sphalerite, galena, jamesonite and some vein minerals. The gold content in the ore is about 6 g/t. The granulometric composition of gold is extremely uneven. Most of the gold particles are less than 10 μm in size and are coated with gold-bearing minerals, which hindered their release during grinding. In accordance with the characteristics of the gold deposit, gravity enrichment method has been used to extract the liberated coarse gold. Studies have shown that the gravity separation process is used for the primary processing of ore to recover coarse gold particles. The gold content and recovery in the gravity separation concentrates are 46.58 g/t and 44.59 %, respectively.
Key words Tajikistan, Pakrut gold deposit, electrum, pyrite, arsenopyrite, mineralogy, geochemistry, grinding, shaking table, extraction, gravity enrichment
Article information
References 1. Zvereva N. V., Myazin V. P. Increasing the level of gold recovery during the combined processing of gold containing lead-zinc ores. Transbaikal State University Journal, vol. 28, no. 10, pp. 6–14, 2022. (In Rus.) 2. Zinchenko Z. A., Samikhov S. R. Processing of molten gold-bearing ores of Tajikistan. Mining Journal, no. 4, pp. 97–98, 2014. (In Rus.) 3. Kamkin R. I., Alexandrov P. V., Frolov V. S. BASF reagents for heap leaching of gold-bearing ores. Gold and Technologies, no. 1, pp. 70–71, 2018. (In Rus.) 4. Komogortsev B. V., Varenichev A. A. The problems of processing poor and insistent gold bearing ores. Mining Informational and Analytical Bulletin (Scientific and Technical Journal), no. 2, pp. 204–218, 2016. (In Rus.) 5. Ushakov A. R., Romanov S. A., Onalbayev E. R., Dzhumaniyazov D. I. Sarmientization is an important prospecting feature of the gold deposits of the Southern Tien Shan. Issues of geology and integrated development of natural resources in East Asia: IV All-Russian Scientific Conference: sat. dokl. Blagoveshchensk: IGiP FEB RAS, 2016. Pp. 73–78. (In Rus.) 6. Mamadvafoev M. M., Genievsky I. P. Geology and forecast resources of the Ukobhoninsky gold field (Central Tajikistan). Mining Journal, no. 4, pp. 14–18, 2013. (In Rus.) 7. Mamadvafoev M. M., Niyozov A. S., Khasanov A. H., Krivoshchekova N. I. The geological and geochemical properties of formation of dykes and localization of the Pakrut gold-ore deposit (Central Tajikistan), Moscow: Nedra, 2008. 104 p. (In Rus.) 8. Rakhmanov O. B., Aksenov A. V., Mineev G. G., Solikhov M. M., Shomurodov H. R. Search for a rational technology for processing stubborn gold-bearing ores with finely impregnated gold from the Ikkizhelon deposit (Northern Tajikistan). iPolytech Journal, vol. 21, no. 6, pp. 119–127, 2017. (In Rus.) 9. Safonov Y. G. Topical issues of the theory of gold deposit formation. Geology of Ore Deposits, vol. 52, no. 6, pp. 487–511, 2010. (In Rus.) 10. Seisembaev R. S., Kozhakhmetov S. M., Kvyatkovsky S. A., Semenova A. S. Extraction of gold from refractory gold-bearing ores by means of reducing pyrometallurgical selection. Metallurg, no. 8, pp. 49–55, 2020. (In Rus.) 11. Surimbaev B. N., Channels E. S., Bolotova L. S., Shalgimbaev S. T. Assessment of gravitational enrichment of gold–bearing ore-GRG. Mining Science and Technology, vol. 5, no. 2, pp. 92–103, 2020. (In Rus.) 12. Fayziev A. R., Nabiev N. F. Genesis of the Pakrut gold deposit (Central Tajikistan). Geodynamics, Substance, Ore Genesis of the East European Platform and Its Folded Frame, 2017. Pp. 225–227. (In Rus.) 13. Khasanov A. H., Mamadvafoev M. M., Efimenko V. N., Kuznetsov N. N., Sladkov N. I. New data on the geology and age of the quartz-gold ore occurrence of the Gissar ridge. Proceeding of the Academy of Sciences of the Tajik SSR, dep. of phys.-math. and geol.-chem. sciences, no. 4, pp. 78–85, 1978. (In Rus.) 14. Kholov K. I., Sharifboev N. T., Samikhov S. R., Dzhurakulov S. R., Zarifova M. S. Gold leaching by various solutions, alternative of cyanide and their prospects in the future. Journal of Siberian Federal University. Engineering & Technologies, vol. 14, no. 4, pp. 433–447, 2021. DOI: 10.17516/1999-494X-0324. (In Rus.) 15. Kholov Kh. I., Samikhov Sh. R., Niyozov A. S. Characteristics of geology, mineralogical and chemical composition of ores of the Dzhizhikrut deposit. Eurasian Scientific Union, no. 6, pp. 413–416, 2018. (In Rus.) 16. Shadchinev A. S., Bakhtdavlatov R. D. Geological structure and minerals of the Phanerozoic of Kuhistan (Central Tajikistan). Dushanbe, 2008. 406 p. (In Rus.) 17. Scherbakov Y. G. Distribution and conditions of gold concentration in ore provinces. Moscow: Nauka, 1967. 270 p. (In Rus.) 18. Yurgenson G. The first data from Uytenbogaardite in the ore of the taseyevskoye gold-silver deposit in Eastern Transbaikalia (Russia). Transbaikal State University Journal, vol. 28, no. 6, pp. 26–36. 2022. DOI: 10.21209/2227-9245-2022-28-6-26-36. (In Rus.) 19. Ali D. Advanced Analytics for Mineral Processing. Advanced Analytics in Mining Engineering: Leverage Advanced Analytics in Mining Industry to Make Better Business Decisions. Cham: Springer International Publishing, 2022. Pp. 495–522. (In Eng.) 20. Aylmore M. G. Alternative lixiviants to cyanide for leaching gold ores. Gold Ore Processing. Elsevier, 2016. Pp. 447–484. (In Eng.) 21. Burt R. O. Gravity concentration methods. Mineral processing design. Springer, pp. 106–137, 1987. (In Eng.) 22. De Michelis I., Olivieri A., Ubaldini S., Ferella F., Beolchini F., Veglio F. Roasting and chlorine leaching of gold-bearing refractory concentrate: Experimental and process analysis. International Journal of Mining Science and Technology, vol. 23, no. 5, pp. 709–715, 2013. (In Eng.) 23. Dominy S. C., O’Connor L., Glass H. J., Xie Y. Geometallurgical study of a gravity recoverable gold orebody. Minerals, vol. 8, no. 5, pp. 186–190, 2018. (In Eng.) 24. Kononova O. N., Kholmogorov A. G., Kononov Y. S., Pashkov G. L., Kachin S. V., Zotova S. V. Sorption recovery of gold from thiosulphate solutions after leaching of products of chemical preparation of hard concentrates. Hydrometallurgy, vol. 59, no. 1, pp. 115–123, 2001. (In Eng.) 25. Murthy D. S. R., Kumar V., Rao K. V. Extraction of gold from an Indian low-grade refractory gold ore through physical beneficiation and thiourea leaching. Hydrometallurgy, vol. 68, no. 1–3, pp. 125–130, 2003. (In Eng.) 26. Samadov A. U., Nosirov N. I., Umirzoqov A. A. Overview of the concepts of gold recovery from stale tailings of a gold recovery plant // Barqarorlik Va Yetakchi Tadqiqotlar Onlayn Ilmiy Jurnali, vol. 2, no. 1, pp. 3–8, 2022. (In Eng.) 27. Stange F., Helle S., Collao S. Exploratory Potential for Gold Placer Deposits in the Coastal Range, BioBío Region, South-Central Chile. International Journal of Geosciences, vol. 9, no. 11, pp. 635–657, 2018. (In Eng.)
Full articleMineralogical and Geochemical Features of the Gold-Containing Ores of the Pakrut Deposit (Central Tajikistan) As the Basis of Gravity Enrichment