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Aleksandr N. Evdokimov
Aleksandr N. Evdokimov
Professor, Ph.D., Dr.Sci., Professor
Saint Petersburg Mining University
Professor, Ph.D., Dr.Sci., Professor
Saint Petersburg Mining University
Saint Petersburg
Russia
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Articles

Geology
  • Date submitted
    2020-08-20
  • Date accepted
    2021-04-01
  • Date published
    2021-05-25

Features of the mineral and chemical composition of the Northwest manganese ore occurrence in the Highveld region, South Africa

The Northwest manganese ore mineralisation is located at a relative distance from traditionally known manganese mining areas in a new manganese-bearing region (Highveld) in the Northwest Province, Republic of South Africa. The ore occurrence was studied on farms: Buchansvale 61 IQ, Weltevreden 517 JQ, Rhenosterhoek 343 JP and Kafferskraal 306 JP. The data obtained from studying the geology of the area pointed out to interests regarding the development criterias for search of similar ore mineralisations in the northwest region of South Africa. The ore occurs predominantly in the form of powdered manganese wad, manganese nodules and crusts, confined to the karstic structures of the upper section of the dolomites. X-ray powder diffraction (XRD), Scanning electron microscopy with energy dispersive link (SEM-EDS) and X-ray fluorescence were utilized to unveil the mineral and chemical composition of the ore samples. The present study therefore presents the results on both chemical and mineral composition of manganese ores, and their depth and longitudinal distribution. Karstic areas causing an increased local thickness of the ore body were identified. The geochemical and microspcopic study of the ores indicates their supergene nature. The main ore minerals includes cryptomelane, lithiophorite, purolusite, hollandite and romanechite associated with impurity components of Ba, Ce, Co, La, Cr, Zn and V.

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Aleksandr N. Evdokimov, Benedict L. Pharoe (2021) Features of the mineral and chemical composition of the Northwest manganese ore occurrence in the Highveld region, South Africa. Journal of Mining Institute. Vol 248. p. 195-208. DOI: 10.31897/PMI.2021.2.4
Geology
  • Date submitted
    2016-10-06
  • Date published
    2016-01-01

Geochemical features and prospects of ore content in black slates in Tajmyr-Severnaya zem-lya gold formation

Gold content, at least twice higher than the gold percentage abundance in Earth’s crust, has been discovered in a number of black slates formations in Tajmyr-Severnaya Zemlya gold province. The article shows the measurement data on organic carbon and ore elements concentrations in carbonaceous sediments, with pyrite, being their constituent, in the region. The dependence of ore elements availability, including gold, on sulphidisation degree in rocks has been identified in an ore bundle of Golyshevskaja strata. The comparison of gold concentrations in sampled monocrystals and pyrite aggregates has been carried out. It has been empirically supported that the content of gold, lead, molybdenum, cobalt, nickel and copper normally grows with the increase of sulphides quantity. Concentrations of chromium, manganese, tin, vanadium decrease respectively; however, titanium and zinc content remains unchanged.

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A. N. Evdokimov, V. I. Fokin, N. K. Shanurenko (2016) Geochemical features and prospects of ore content in black slates in Tajmyr-Severnaya zem-lya gold formation. Journal of Mining Institute. Vol 217. p. 13.
Geology
  • Date submitted
    2016-10-11
  • Date published
    2015-06-01

Mineral resources in arctic islands of Russia

There is an increased interest in the Arctic regions of the planet in recent years. Russia has the longest Arctic shelf with great prospects for hydrocarbons under its jurisdiction. So, the Arctic Islands will play a major role as an infrastructural base for development of oil and gas resources on the shelf in the Arctic Ocean in the near future. Minerals of major islands and archipelagos of the Russian Arctic: Novaya Zemlya, Franz-Josef Land, Severnaya Zemlya, the New Siberian Islands and the Wrangel Island as well as the Spitsbergen archipelago (Norway) where Russia has its own territory formally enshrined for the extraction of coal and other minerals are considered in the article.

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A. N. Evdokimov, A. N. Smirnov, V. I. Fokin (2015) Mineral resources in arctic islands of Russia. Journal of Mining Institute. Vol 216. p. 5.
Geology and metallogeny
  • Date submitted
    2016-11-10
  • Date published
    2013-01-01

Late paleozoic alkaline-ultramaphic magmatism in Spitsbergen archipelagoes

Findings in the northwest of Spitsbergen of the hypabyssal intrusions of maphic and ultramaphic compositions with the increased content of alkalis and accessory minerals of kimberlite gave base for the more thorough studies of the region of their propagation, determination of laws governing the arrangement in the zone of the deep submeridional breaking zone  Breybogen, study of the physical composition, enriched by xenolites of the mantle level: lherzolites and wehrlites. The Late Paleozoic age, which coincides with the age of kimberlite of Arkhangel'sk region and the mineral-petrographical composition of these species testify about the significant similarity to the pyropic subfacies of kimberlitic magmatism.

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A. N. Evdokimova, A. N. Sirotkin, V. S. Chebaevskii (2013) Late paleozoic alkaline-ultramaphic magmatism in Spitsbergen archipelagoes. Journal of Mining Institute. Vol 200. p. 201.
Geotechnology for development of solid mining fields
  • Date submitted
    2016-11-14
  • Date published
    2012-05-01

Historical analysis of the system of estimation and expert’s examination of explored ore reserves in Russia

Acting in Russia methodology of estimation and expert’s examination of calculated mineral reserves has been organized in the Soviet period, during development of the rigidly centralized system of the state planning and management. Since, 20 years there isn’t in the country any state monopoly (and financing) in the mining brunch and geological exploration. The new approaches are needed in procedure of estimating mineral reserves explored by the private enterprises. Anyway, functions, which the State Commission on mineral reserves (SCR) used to carry out in the Soviet time, remain nearly the same at present. Its full-scale authority, obligatory specifications are in clear contradiction with real economic relationship in the country.  Computer modeling of ore bodies, composed on the base of geostatistical analysis of the exploration data, determines their natural contours and the ore grade distribution far more precisely than the formal index of the reserve’s category. There isn’t any necessity to approve in the SCR the so called group of the ore deposit complexity, nor the Technical-economic validation of limiting conditions. The mere procedure of the state approval of explored ore reserves ought to have the record keeping character.

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A. V. Kozlov, V. A. Stepanov, I. G. Kir'yakova, A. N. Evdokimov (2012) Historical analysis of the system of estimation and expert’s examination of explored ore reserves in Russia. Journal of Mining Institute. Vol 199. p. 211.
Geology
  • Date submitted
    2016-12-29
  • Date published
    2016-06-01

Composition, age and tectonic meaning of granite boulders in the devonian conglomerates of the north-west part of Spitzbergen

Identifying complexes of the early Proterozoic age in the composition of crystal foundation is a key task in studying pre-Cambrian formations of the whole of Spitzbergen and its northwestern part in particular. The territory of that region is formed by three deeply metamorphosed complexes that underwent the processes of migmatization and granitization in mid-Rifey and were broken through by granitoids of mid-Rifey and mid-Paleozoic. In their turn, the outbursts of the foundation are overlayed by terrigene rocks of the Devonian graben of Spitzbergen, conglomerates forming a large share among them. In the course of petrographic and chemical studies of such compositions, as well as isotopic characteristics of zircons from the boulders of basal conglomerates of Red Bay (D 1 ) series, the suite of Wolfberget at Cape Conglomeratodden the presence was identified of reddish (meat-red) granites of isotopic age of 1631±19 Mil years, which is comparable to late Karelian processes manifested actively across the archipelago. It is also proven that transformations of these rocks within the range of 380±42 Mil years are well associated with mid-paleozoic events, considerable restructuring of the foundation associated with them. The age range we defined is another proof of manifestation of early pre-Cambrian (late Karelian) processes in the northwestern Spitzbergen.

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A. N. Sirotkin, A. N. Evdokimov (2016) Composition, age and tectonic meaning of granite boulders in the devonian conglomerates of the north-west part of Spitzbergen. Journal of Mining Institute. Vol 222. p. 789. DOI: 10.18454/pmi.2016.6.789