Abstract
For effective commercial development of deposits, an increase in the information content of operational exploration is required. In recent years, the range of methods used to obtain complete and reliable information about the structure and properties of the rock mass of a developed field include remote methods of high-frequency electrical prospecting, in particular, the ground penetrating radar (GPR) method. The paper presents a methodological experience in the interpretation of GPR data of sandy river sediments based on the identification of radar facies. In the considered area, four types of radar facies have been identified that characterize the structure of sandy deposits and the morphology of the river bed. The criteria for identifying radar facies were used to analyze wave patterns of loose sediments in a sand and gravel pit and a placer gold deposit. Experimental GPR investigations are presented by data from a sandy-gravel pit (Warsaw, Poland) and from a placer gold deposit (Yakutia, Russia). As an example, a GPR section along the Paplin quarry and its interpretation, with the identification of GPR facies, is presented. A cross-sectional GPR profile of the dredging landfill is considered for the placer gold deposit. The analysis of the wave pattern was carried out, geological boundaries were highlighted. Based on the interpretation results, the characteristics of the rocks were given. It was noted that according to the GPR data, it is possible to identify zones of uplift of bedrock, which can affect the course of the dredge. As a result of using GPR in a swampy area where drilling was impossible, a deep three-layer section was obtained. The presented results of the successful use of GPR investigations and methodological approaches in the interpretation of data, show the promise of using the GPR method in assessing mining and geological conditions, in particular, placer deposits. At the same time, the efficiency of obtaining data can further contribute to the optimization of technology and increase the efficiency of field development.
Highlights
A significant part of gold is mined from placer deposits in the Far East region
High-frequency electrical prospecting methods have been included in the set of methods used to detail the mining and geological conditions of the developed field
Experiments on the use of ground penetrating radar in the conditions of the developed massif showed the method promising for studying the structure of loose deposits
Summary
A significant part of gold is mined from placer deposits in the Far East region In this area, mining operations are associated with permafrost and difficult mining and geological conditions. At the stage of actual mining, the most significant are the form and internal structure of mineral deposits These indicators to a large extent determine the choice of the scheme and method of stripping and preparation for stope excavation, the parameters of development systems and production processes, and safe mining. The most effective of them for studying the upper part of a geological structure is the GPR method [1,2,3] The advantages of this method are high performance and resolution, the ability to work at different conditions. The variability of the properties and condition of the rock mass during mining requires active scientific and methodological research to adapt and improve the GPR technology for studying the mining and geological conditions of deposits being mined [4, 5]
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