Geophysical characteristics of the Belaya Gora gold deposit (Khabarovsk Krai, Russia)
https://doi.org/10.24930/1681-9004-2022-22-1-118-134
Abstract
Research subject. SThe geophysical fields and physical properties of altered gold-bearing rocks within the Belogorskoye ore field and the Belaya Gora gold deposit located in the Khabarovsk Krai.
Materials and methods. Magnetic field and the distribution of electrical resistivity and polarisability obtained during land-based surveys as well as magnetic susceptibility, apparent electrical resistivity and polarisability of the samples from trenches and drilling cores have been studied. The analysis of the spatial correlation of the features of geophysical fields and gold mineralisation has been carried out. The physical properties of rocks are analysed depending on the intensity and type of superimposed hydrothermal alterations and gold content.
Results. A significant decrease of magnetic susceptibility for all types of altered rock is indicated. Differences in electrical resistivity and polarisability are observed for hydrothermally altered rocks of the pre-ore stage and ore-bearing metasomatites. The former, with a relatively increased electrical resistance, have the highest polarisability (within the ore field), while the latter are characterised by an even higher resistance, but with the significant decrease in polarisability, which remains slightly elevated relative to unaltered rocks. These patterns also determine the geophysical characteristics of the ore field and deposit. The gold ore field is characterised by a significant decrease in the magnetic field intensity, an areal anomaly of increased polarisability, and, in general, an increased apparent electrical resistance. The deposit itself, as an area covering ore bodies, is generally characterised by an even more intensive increase in apparent electrical resistivity and a relative decrease in polarisability against its generally high background.
Conclusions. Based on the performed research, a geophysical model of the Belaya Gora gold deposit is proposed, which may be used as a reference during the planning of geophysical works and the interpretation of geophysical data during the exploration works for epithermal gold mineralisation within the volcanic-tectonic structures in the Nizhne-Amursky region.
Supporting agencies: The authors are grateful to the management of the Belaya Gora LLC and RDM LLC for agreeing to use some of their materials, and to V.V. Kosyatov for his support during the work.
About the Authors
M. Yu. Nosyrev
Institute of Tectonics and Geophysics of Far East Branch of Russian Academy of Science
Russian Federation
Russian Federation
65 Kim Yu Chen st, Khabarovsk 680000
A. Yu. Yurchuk
Institute of Tectonics and Geophysics of Far East Branch of Russian Academy of Science
Russian Federation
Russian Federation
65 Kim Yu Chen st, Khabarovsk 680000
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Review
For citations:
Nosyrev M.Yu., Yurchuk A.Yu. Geophysical characteristics of the Belaya Gora gold deposit (Khabarovsk Krai, Russia). LITHOSPHERE (Russia). 2022;22(1):118-134. (In Russ.) https://doi.org/10.24930/1681-9004-2022-22-1-118-134
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