Nikolay Bortnikov

Institute of Geology of Ore Deposits. Petrography. Mineralogy and Geochemistry. Russian Academy of Sciences · Department of Mineralogy

The economic importance of gold deposits in the modern world is very great. While in the last century the Witwatersrand basin, with its gold-bearing conglomerates, which provided more than a third of all recorded Au production of humanity, stood out sharply as the largest supplier of gold (Cairncross, 2021), a greater contribution now comes from nu...

In the process of the formation of classical lateritic bauxites in the Futa Jallon-Mandingo province, due to a complex of two-three-stage genesis, different lithological and genetic types of bauxites were formed in external characteristics, color, texture, structure. The proposed genetic typification of bauxite, based on the textural and structural...

The Republic of Guinea has outstanding mineral resources. An analysis of current data has shown that in the near future this country will maintain its leading position in the world in the extraction and export of bauxite, as well as increase the production and export of alumina. Guinea has significant potential to develop large and rich iron ore de...

The large Zun-Kholba deposit, belonging to a numerous group of orogenic-type gold deposits, is in the Eastern Sayan (Russia) – a segment of the Altai-Sayan fold system of the Central Asian Orogenic Belt. The paper discusses the results of mineralogical, geochemical, geochronological and Pb-isotopic studies of gold mineralization, the purpose of whi...

An Erratum to this paper has been published: https://doi.org/10.1134/S1028334X23070036

An Erratum to this paper has been published: https://doi.org/10.1134/S1028334X23070358

An Erratum to this paper has been published: https://doi.org/10.1134/S1028334X23070255

An Erratum to this paper has been published: https://doi.org/10.1134/S1028334X23070334

An Erratum to this paper has been published: https://doi.org/10.1134/S1028334X23070140

Placer deposits had (and for a number of components still have) an important role in providing strategic types of mineral resource base for both Russia and the world as a whole. Placers have a number of advantages that make them in demand by the mining industry: relatively shallow (often accessible for open-pit mining) occurrence, disintegrated sta...

An Erratum to this paper has been published: https://doi.org/10.1134/S1028334X23060090

For the large Svetlinsk gold deposit (South Urals) evidences of partial melting of minerals and possible participation of polymetallic melts in the concentration and redistribution of gold and other metals are given. Finding of bismuth and antimony minerals in ores, among which there are gold minerals new to the deposit (pampaloite, montbrayite and...

The Tatar bauxite deposit on the territory of the Russian Federation was formed as a result of sedimentation in contact-karst depressions of the products of denudation of lateritic weathering crusts of amphibolites. Detailed mineralogical studies of bauxites made it possible to reliably reconstruct the conditions for their formation. As it turned o...

This article considers the issue of Russia’s self-sufficiency in import-dependent types (including critical ones) of strategic mineral raw materials. It is shown that, in recent years, the Government of Russia has been paying much attention to the development of the mineral-resource base (MRB) of strategic raw materials: in 2018, the “Strategy for...

The paper presents new isotopic U–Pb zircon data (LA–ICP–MS method) on the intrusive rocks from the Chinorsai massif, which is spatially and probably genetically related to the large Jilau tungsten-gold deposit. This deposit, together with the other large Au deposits (Muruntau, Zarmitan, Kumtor, etc.) is part of the largest Au (Au–W) metallogenic b...

The Tatarka bauxite deposit on the territory of the Russian Federation was formed as a result of sedimentation of the products of denudated lateritic weathering crusts of amphibolites in contact-karst depressions. Detailed mineralogical studies of bauxites made it possible to reconstruct reliably the conditions for their formation. As it turned out...

Fahlore crystals and aggregates from the Darasun gold deposit show complex rhythmic-oscillatory chemical zoning resulting from crystal growth and coupled dissolution-reprecipitation reactions. Formation temperatures of these zonal fahlores were determined using the Raabe & Sack (1984) geothermometer and results of ~2780 microprobe analyses. Fahlore...

An Erratum to this paper has been published: https://doi.org/10.1134/S1075701523360023

A rare gold–telluride montbrayite from the large Svetlinsk gold–telluride deposit (South Urals, Russia) was comprehensively studied using optical microscopy, scanning electron microscopy, electron microprobe analysis, reflectance measurements, electron backscatter diffraction, and Raman spectroscopy. Significant variations in the composition of the...

Special issue: The Mineral-Resource for High-Tech Industry of Russia: Key Problems for Development. Edited by N. Bortnikov (1) Problems of the Development of the Mineral and Raw-Material Base of High-Tech Industry in Russia N. S. Bortnikov, A. V. Volkov, A. L. Galyamov, I. V. Vikentiev, A. V. Lalomov, and K. Yu. Murashov (2) Mineral and Raw-Materia...

The article considers the problem of self-sufficiency of Russia with import-dependent types (including critical) of strategic mineral raw materials (SMRM). It is shown that in recent years, the Russian Government has been paying much attention to the development of the mineral resource base (MSB) of SMRM: in 2018, the Strategy for the Development o...

The paper presents the first data of the isotopic zircon U–Pb study (LA–ICP–MS method) on the granodiorite-granite from the Sardara (Sarykty) pluton in the district of the giant Muruntau Au deposit in the Western Tien Shan (Uzbekistan). In a single sample, three age groups of zircon crystals identified, with their concordant U–Pb age being 322.0 ±...

For the first time, a new noble-metal (Pt–Au–Pd) Vasilinovskoe ore occurrence discovered near the village of Kharp in the Yamalo-Nenets Autonomous Okrug is described. It is associated with amphibolized gabbroids and subordinate pyroxenites of the Kershor complex, dated mainly to the Late Ordovician. In these rocks, mineralization zones with an appa...

A new concept of the formation of glauconite from the Paleocene deposits of the sedimentary cover of the southwestern part of the Near-Volga monocline is presented – it was formed as a result of halmyrolysis of ash material in lake conditions. Glauconitization is confined to the Paleogene thermal maximum and the periphery of active volcanism along...

In this work, a crystal chemical analysis of the known experimentally deciphered crystal structures of tetrahedrite group minerals was carried out in order to reveal the relationships between the occupancies of anion crystallographic sites in the structures, their effective sizes and unit cell parameters. To achieve this aim, we analyzed the effect...

Представлена новая концепция образования глауконита из палеоценовых отложений осадочного чехла юго-западной части Приволжской моноклинали, сформированных в результате гальмироли- за пеплового материала в озерных условиях. Глауконитизация приурочена к палеогеновому терми- ческому максимуму и периферии действующего вулканизма по всему подвижному пояс...

For the first time, a granulometric analysis of lateritic soils was carried out and the sources of the substance involved in the formation of the degradation zone in the bauxite-bearing laterite profile of the bauxite-bearing province of Futa Jallon-Mandingo were identified. Throughout the province, on the stony rocks of the lateritic covers, the s...

The LA–ICP–MS U–Pb age was determined for the first time for zircon from granodiorites–granites of the Sardara (Sarykty) intrusive in area of the giant Muruntau gold deposit in Western Tien Shan (Uzbekistan). Three crystal groups were identified in a combined sample: their concordant U–Pb age is 322.0 ± 3.7 (four grains), 301.6 ± 2.1 (11 grains), a...

For the first time, a granulometric analysis of lateritic soils was carried out and the sources of the substance involved in the formation of the degradation zone in the bauxite-bearing laterite profile of the bauxite-bearing province of Futa Jallon-Mandingo were identified. Throughout the province, on the stony rocks of the lateritic covers, the s...

The results of detailed exploration and year-round observations of the hydrogeological regime at large deposits, as well as special hydrochemical studies of various types of water and changes in the gas composition of the underground atmosphere in the lateritic weathering crust, of the very large bauxite-bearing province, Fouta Djallon–Mandingo, th...

The paper is devoted to founder of the Theory of Prospecting and Exploration of Mineral Deposits V.M. Kreiter

The crystal structure of the rare mineral caryochroite is determined for the first time using X-ray diffractometry and electron microdiffraction data. The new idealized crystal formula of the mineral is [Na(Sr 0.5 Ca 0.5 )Mg] 3 [Fe $$_{8}^{{3 + }}$$ Mn( $${\text{Fe}}_{{0.5}}^{{2 + }}{{\square }_{{0.5}}}$$ )] 10 (Ti 2 Si 12 )O 37 (OH) 14 (Н 2 О) 3 ....

The crystal structure of rare titanosilicate cariochroite was deternined using X-ray powder and srlected area diffraction data. The crystallochemical formula proposed – [Na(Sr0.5Ca0.5)Mg]3[Fe\(_{8}^{{3 + }}\)Mn(\({\text{Fe}}_{{0.5}}^{{2 + }}{\kern 1pt} {{\square }_{{{\text{0}}{\text{.5}}}}}\))]10(Ti2Si12)O37(OH)14(Н2О)3. Monoclinic unit cell parame...

The correlation between the crystal morphological peculiarities of gibbsite and its position in a bauxite-bearing weathering profile is revealed from the example of the Tsentral’noe deposit of the Chadobets Uplift. The free space favorable for the growth of gibbsite increases from bottom to top in various parts of the profile as a result of infiltr...

The problem of provision of the Russian high-tech industry with critical minerals is becoming more drastic every year due to the steady reduction of rich and relatively accessible deposits in technical and economic terms and the instability of its import delivery from producer countries due to political instability in the world. Domestic and global...

(1) Classification of Polymetallic Ore-Forming Processes and Transitional VMS–SEDEX–MV-type: the Example of the Giant Ozernoe Deposit in Transbaikalia, Russia I. V. Vikentyev, B. B. Damdinov, O. R. Minina, A. V. Spirina, L. B. Damdinova (2) The World’s Largest Bauxite-Bearing Province, Fouta Djallon–Mandingo (West Africa). Part 4: a Zoning Mechani...

Obtained as a result of detailed exploration and year-round observations of the hydrogeological regime at large deposits, as well as special hydrochemical studies of various types of water and changes in the gas composition of the underground atmosphere in the lateritic weathering crust of the largest bauxite-bearing province FDM, thanks to a relia...

Using the example of the Central Chadobets uplift deposit, the relationship of the crystallomorphological features of gibbsite with its position in the bauxite-bearing profile of the weathering crust is revealed. From the down up, in various parts of the profile, as a result of infiltration metasomatosis and various physico-chemical conditions, the...

The distributions of trace elements in pyrite were studied in samples of high-grade gold ores from the Talatui, Teremkyn, and Darasun deposits. The paper presents LA-ICP-MS data on concentrations of trace elements in pyrite in gold ores from mineral deposits of the Darasun goldfield, which were produced by a single fluid–magmatic system at various...

Gold-bearing mineral associations of gold-quartz and gold-sulfide-quartz occurrences of the Taimyr-Severnaya Zemlya Orogen (Nizhnelitkenskoe on Bolshevik Island, Vidimoe, Nerpichye, Konechninskoe in the myogeoclinal zone of the western Taimyr and Yasnenskoe, Malinovskoe in the accretion zone in the northern part of the Central Taimyr) have been stu...

In the Polar Urals, there are few small granitoid intrusions (Yarkeu, Yayu and Pogurei complexes), which are usually associated with the Ural collision. Their Carboniferous-Early Permian age, in most cases, is based on methodologically outdated K/Ar dates, and is also assumed from field geological relationships. We have studied the monzonitoids of...

For the first time, based on the data of the study of fluid inclusions, the PTX parameters of the formation of gold mineralization of the Taimyr-Severozemelsky orogen were established. The temperature of formation of gold ores covers the range from 310 to 105°C, the pressure was not lower than 110–96 MPa. The ore-forming fluids were characterized b...

Gold concentration in natural pyrite from the high-grade sulfide ores of the Darasun gold district and pyrite synthesized from the solution saturated in gold has been studied using laser ablation inductively coupled plasma mass-spectrometry. Parameters and composition of the solution from which pyrite was grown were chosen according to the data obt...

Pampaloite AuSbTe, a rare gold-antimony telluride that was first described in 2019 from the Pampalo gold mine, Finland, was found in samples from the large Svetlinsk gold-telluride deposit, South Urals, Russia. Optical microscopy, scanning electron microscopy, electron microprobe analysis, reflectance measurements, electron backscatter diffraction...

Fahlores from the epithermal Mangazeyskoye Ag-Pb–Zn ore deposit (Sakha, Russia) typically occur in rhythmically zoned crystals. In contrast to typical (Ag,Cu)10(Fe,Zn)2Sb4S13 fahlores, up to about 2.6 of the 13 sulfur atoms in the formula unit may be vacant and many of them have Ag/(Ag + Cu) ratios substantially above those established for (Ag,Cu)1...

Zircon is a ubiquitous accessory phase that carries important isotopic and geochemical information. Experimental work indicates that zircon solubility in silicate melts increases exponentially with decreasing silica; accordingly, crystallizing mafic magmas would only precipitate zircon from the last drops of residual melts, likely of granophyric co...

Numerous epithermal Au–Ag deposits and ore occurrences of the Chukchi Peninsula are localized in the Cretaceous Okhotsk–Chukotka (OCVB) continent-marginal and Late Jurassic–Early Cretaceous Oloi (OVB) island arc volcanic belts and in Early Cretaceous postcollisional volcanic troughs. Volcanotectonic depressions, calderas, and volcanic domes control...

—We have studied the mineral composition of ores from the Pepenveem epithermal Au–Ag deposit, which is a promising new object of the Chukchi Peninsula. It has been found that the ore formation process was developed in the following sequence: Pyrite, arsenopyrite, and marcasite were deposited at the early stage, next were Pb, Zn, and Cu sulfides; at...

This paper synthesizes available and original U-Pb geochronological and hafnium and oxygen isotope data on zircon from gabbro and peridotites in the oceanic core complexes (OCC) of the Mid-Atlantic Ridge (MAR) extending for 2000 miles along its crest zone. We attempted to reproduce the evolution of MAR magmatism and to determine the geochemical and...

The study of lateritic bauxite by electron microscopy revealed abundant products of interaction between organic matter and minerals. Abundant biomineral films of different genesis and composition were found, including Al, Fe, Al-Fe, Al-Si, Al-Fe-Si, sorbed rare and rare-earth elements (REE). The evolution of these films from amorphous to crystalliz...