Abstract
This paper presents the results of applying geophysical methods in the study of placers of various genetic types in the Khabarovsk Territory. The main research methods are vertical electrical and remote induction sounding. Geophysical studies of alluvial placers were carried out along river valleys, at watersheds and small streams of the Turchik lode-and-placer gold cluster. The main tasks to be solved include the search for potential structural gold traps (paleoriverbeds and ravines), assessment of the bedrock surface, and determination of the thickness of overlying loose deposits. The work we performed makes it possible to identify a prospecting indicator for placer gold in a given area, i.e., lower electrical resistivity values in the presence of a local positive magnetic anomaly. The coastal–sea placer was studied on the Nikolai Bay coast (Sea of Okhotsk). The study was focused on the lithological subdivision of a geologic section in terms of physical properties. According to the study results, electrical conductivity is drastically different in the bedrock at the section base, sea sediments, and continental deposits. The application of electrometry methods is supported by the fact that rocks differ very distinctly in electrical properties. This fact is confirmed by placer mining activities at the technogenic deposits of the Verkhnyaya Uda River and the Sofiisky mine. Mining and geological factors that complicate dredging operations, such as permafrost and bouldery debris, were studied at legacy placers by induction methods. According to the research results, boulders or frozen rocks are manifested in the same way in electrical readings, in particular, as a sharp increase in electrical resistivity. Hence, abnormally high-resistivity zones make it possible to identify hazardous areas for a passing dredger. Based on these findings, the application of electrical exploration technologies is highly efficient in the study of different types of placer gold deposits.
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ACKNOWLEDGMENTS
We are grateful to our colleague: geophysicist Vladimir Pavlovich Bakaev, the main enthusiast of our joint Far East expeditions.
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Davydov, V.A. The Use of Electrometry in the Study of Gold Placer Deposits in the Khabarovsk Territory. Russ. J. of Pac. Geol. 17, 228–239 (2023). https://doi.org/10.1134/S181971402303003X
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DOI: https://doi.org/10.1134/S181971402303003X