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гравитационная аномалия

Geotechnical Engineering and Engineering Geology
  • Date submitted
    2023-09-08
  • Date accepted
    2024-06-03
  • Date published
    2024-12-25

Modern approaches to barium ore benefication

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Barite is one of the critically important minerals in several industries, including the fuel and energy, nuclear, and medical sectors. For decades, its extraction did not require any complex techniques; however, with the depletion of rich barite-bearing veins around the world, the circumstances have changed. While the demand for barite is growing widely, it is necessary to optimize and improve the existing methods for benefication of barite and barite-containing ores, and create new approaches to extracting this mineral, as well as develop technogenic barite deposits accumulated in large quantities during the previous ore production. Dumps and tailings often demonstrate high barite content, while new mining technologies make its extraction cost-efficient. Russian and foreign papers of the last 14 years provide data on the current state of primary and technogenic deposits, areas of barite use and the approaches employed for its benefication. Considering the expansion of the range of barite applications, the growing need for the mineral in the oil and gas industry and the difficulties in developing new barite deposits in Russia, the importance of new approaches to the enrichment of ore tailings in polymetallic deposits is revealed.

How to cite: Yurkevich N.V., Grosheva T.V., Edelev A.V., Gureev V.N., Mazov N.A. Modern approaches to barium ore benefication // Journal of Mining Institute. 2024. Vol. 270 . p. 977-993. EDN RZNPBK
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2022-06-25
  • Date accepted
    2023-06-20
  • Date published
    2024-02-29

Determination of the accuracy of leveling route based on GNSS/leveling and Earth gravitational model data SGG-UGM-2 at some typical regions in Vietnam

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This paper presents the accuracy of leveling routes determined by using GNSS/leveling at three grades and Earth gravitational model data SGG-UGM-2 in four regions of Vietnam by calculating the difference between the measured height anomalies and the model of pairs of points. The calculation is made based on the total points of three grades for four regions (99 in the Northwest, 34 in the Red River Delta, 130 in the Central Highlands, and 96 in the Mekong River Delta) with the leveling routes, connected between pair of points in each region are 189, 92, 294, and 203. The calculated results of the percentage of accuracy of the leveling routes of the four regions have shown that most of the leveling routes are satisfactory (grades I-IV, and technical leveling). The determination of the accuracy of the leveling route is completely applicable to other areas when the points have simultaneous ellipsoid and leveling heights and it also helps managers and surveyors to predict the accuracy of the height points when the above-mentioned leveling routes are connected and to take reasonable measures when implementing the project.

How to cite: Tham B.T.H., Thanh P.T. Determination of the accuracy of leveling route based on GNSS/leveling and Earth gravitational model data SGG-UGM-2 at some typical regions in Vietnam // Journal of Mining Institute. 2024. Vol. 265 . p. 34-44. EDN UGMFEW
Metallurgy and concentration
  • Date submitted
    2022-05-17
  • Date accepted
    2022-09-06
  • Date published
    2022-11-03

Methodological substantiation of the choice for optimal modes of equipment operation during the stage-wise concentrate removal in iron ores beneficiation

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The urgent task of improving the quality of iron ore concentrates was studied. We propose to use the stage-wise removal of the concentrate by combining fine screening, regrinding, and magnetic-gravity separation. Exemplified by magnetite ore from the Stoilensky GOK, a scientific and methodological approach to the search for optimal separation parameters and modes was substantiated. It includes several stages: studying the particle size distribution and release of useful components in the feed product to select classification parameters; a series of experiments on grinding oversize products to diverse sizes; beneficiation of the obtained products by MG separation. To select the optimal parameters of ore preparation, an analysis of the beneficiation efficiency was used, which is calculated according to the Hancock – Luyken criterion. The results of the research are experimental dependences that connect the process parameters of beneficiation with those of fine vibratory screening. For the studied ferruginous quartzite ore processed at the Stoilensky GOK, the obtained dependences can be described by a second-order polynomial with a high accuracy of approximation. The best performance is achieved with a particle size of 0.1 mm: Fe tot content in the concentrate is 69.7 %, recovery is 85 %, classification efficiency is 80.4 %. The top size of the product in this case is 0.076 mm, which corresponds to 70-73 % grinding size of –0.045 class.

How to cite: Opalev A.S., Alekseeva S.A. Methodological substantiation of the choice for optimal modes of equipment operation during the stage-wise concentrate removal in iron ores beneficiation // Journal of Mining Institute. 2022. Vol. 256 . p. 593-602. DOI: 10.31897/PMI.2022.80
Geology
  • Date submitted
    2022-05-04
  • Date accepted
    2022-06-15
  • Date published
    2022-07-26

Prospecting models of primary diamond deposits of the north of the East European Platform

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As a result of a comprehensive study of the geological structure and diamond presense of the northern part of the East European Platform, generalization of the data accumulated by various organizations in the USSR, the Russian Federation, and other states, three main prospecting models of primary diamond deposits have been identified and characterized: Karelian, Finnish, and Arkhangelsk. Geological, structural, mineralogical, and petrographic criteria of local prediction, as well as the features of the response of kimberlite and lamproite bodies in dispersion haloes and geophysical fields, are considered using known examples, including data on the developed M.V.Lomonosov and V.P.Grib mines. It is shown that the most complicated prospecting environments occur in the covered areas of the Russian Plate, where, in some cases, the primary diamond-bearing rocks are similar in their petrophysical properties to the host formations. The buried dispersion haloes of kimberlite minerals in the continental Carboniferous and Quaternary deposits are traced at a short distance from the sources. Differences in the prospecting features of magnesian (Lomonosov mine) and ferromagnesian (Grib mine) kimberlites are also shown. Conclusions about the diamond potential of the model objects of various types are given in this paper.

How to cite: Ustinov V.N., Mikoev I.I., Piven G.F. Prospecting models of primary diamond deposits of the north of the East European Platform // Journal of Mining Institute. 2022. Vol. 255 . p. 299-318. DOI: 10.31897/PMI.2022.49
Geology
  • Date submitted
    2020-06-13
  • Date accepted
    2020-06-14
  • Date published
    2020-06-30

Deep structure and geodynamic conditions of granitoid magmatism in the Eastern Russia

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We investigated the deep structure of the lithosphere and the geodynamic conditions of granitoid magmatism in the Eastern Russia within the borders of the Far Eastern Federal District. The relevance of the work is determined by the need to establish the geotectonic and geodynamic conditions of the granitoids petrogenesis and ore genesis in the Russian sector of the Pacific Ore Belt. The purpose of the article is to study the deep structure of the lithosphere and determine the geodynamic conditions of granitoid magmatism in the East of Russia. The author's data on the magmatism of ore regions, regional granitoids correlations, archive and published State Geological Map data, survey mapping, deep seismic sounding of the earth's crust, gravimetric survey, geothermal exploration, and other geophysical data obtained along geotraverses. The magma-controlling concentric geostructures of the region are distinguished and their deep structure is studied. The connection of plume magmatism with deep structures is traced. The chain of concentric geostructures of Eastern Russia controls the trans-regional zone of leucocratization of the earth's crust with a width of more than 1000 km, which includes the Far Eastern zone of Li-F granites. Magmacontrolling concentric geostructures are concentrated in three granitoid provinces: Novosibirsk-Chukotka, Yano-Kolyma, and Sikhote-Alin. The driving force of geodynamic processes and granitoid magmatism was mantle heat fluxes in the reduced zones of the lithospheric slab. The distribution of slab windows along the Pacific mobile belt's strike determines the location of concentric geostructures and the magnitude of granitoid magmatism in the regional provinces. Mantle diapirs are the cores of granitoid ore-magmatic systems. The location of the most important ore regions of the Eastern Russia in concentric geostructures surrounded by annuli of negative gravity anomalies is the most important regional metallogenic pattern reflecting the correlation between ore content and deep structure of the earth's crust.

How to cite: Alekseev V.I. Deep structure and geodynamic conditions of granitoid magmatism in the Eastern Russia // Journal of Mining Institute. 2020. Vol. 243 . p. 259-265. DOI: 10.31897/PMI.2020.3.259