Geophysical research: article

V. Minaev1,2
S. Ustinov1,3
I. Nafigin1
V. Petrov4
V. Poluektov1
I. Fokin5
N. Egorov5
1 Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences
2 Institute of Complex Exploitation of Mineral Resources, Russian Academy of Sciences
3 Sergo Ordzhonikidze Russian State Geological Prospecting University
4 D. Mendeleev University of Chemical Technology of Russia
5 Schmidt Institute of Physics of the Earth, Russian Academy of Sciences
Journal: Geophysical research
Tome: 21
Number: 3
Year: 2020
Pages: 34-49
UDK: 550.83.04:550.812:553.078
DOI: 10.21455/gr2020.3-3
Full text
Keywords: geomechanics, petrophysics, uranium deposit, ultrasound
Аnnotation: By 2023, it is planned to begin development of the Argunskoe deposit, which includes in its bowels up to 35 % of the uranium reserves of the Streltsovskoe ore field in East Transbaikalia. The complex geological and structural structure of the Argunskoe deposit and the exceptional heterogeneity of the host rock stratum, represented by granitoids, gneisses, crystalline schists, syenite-porphyry, marbled limestones, basalts and others, necessitate the identification of the physicomechanical properties of the host rocks to ensure safety and optimization of mining operations, as well as identifying patterns of localization of ore bodies. Significantly complicates the picture is a wide range of post-magmatic, hydrothermal-metasomatic and deformational transformations of rocks of various genesis. Samples of the host rocks of the Argunskoye deposit massif located near the ore bodies were taken. Their porosity and density properties were determined, elastic parameters were studied, and geomechanical tests were carried out in conjunction with mineralogical and petrographic study of rocks. In particular, the nature and intensity of mineral and deformation (structural-petrological) transformations are determined. Differences in the composition and properties of the host rocks were identified, petrophysical characteristics of the rocks, which may be important for the further exploitation of the Argunskoe deposit, were recorded. The research results suggested that dolomitic limestones, which are in maximum contrast with granites and gneisses, can act as a geochemical barrier to the filtration of ore-bearing solutions, contributing to the deposition of ore components. The influence of the nature and intensity of mineral and deformation (structural-petrological) transformations of rocks on their physical properties is shown.