Problem statement. Geophysical studies of the ground dam body and base at the Kangalassky coal mine were carried out as part of monitoring related to the dam’s destruction, propagation of flank release fractures parallel to the ledge, and water seepage into the open pit. The main function of the ground dam is to protect the mining site from the inflow of surface water and preserve frozen rocks of the geological base. The mine workings of the coal mine are watered due to precipitation in the summer, snow melting and frozen rock thawing in the spring. Research objective is to assess the permafrost-ground conditions of the site according to geophysical methods and establish the boundaries of seepage flows that seep through the body and base of the ground dam. Methods of research. Electrical sounding at the dam site were performed by the electrical resistivity tomography method. The research was carried out with the Omega-48 equipment. Ground Penetrating Radar (GPR) study was carried out with a georadar of the OKO-2 series (AB-250M, central frequency 250 MHz). Georeferencing for comparative analysis of GPR parameters and positioning was carried out by the Geobox Fora Smart high-precision (geodetic) GNSS receiver. The cryogenic condition of rock was determined from the drilling data and FLIR SC660 thermal imaging camera data (device by the Shared core facilities of the Federal Research Center “Yakutsk Science Center SB RAS”, grant no. 13.TsKP.21.0016). Results. The results of GPR studies by the method of multi-season measurements in spring and autumn made it possible to objectively assess open pit permafrost conditions that reflect rock mass condition features (frozen or thawed rocks) and the position of the weakness zones (seepage areas and the presence of waterlogged soils). The analysis of geoelectric sections has identified anomalous areas with reduced electrical resistivity interpreted as zones of suprapermafrost surface water penetration into the embankment body with further dam base soil erosion. Possible surface waters migration routes and frozen rock degradation areas have also been identified. Scope of results. The described technique can be used at the enterprises of the mining complex in the North of Russia for engineering-geological and geocryological monitoring of mining and engineering structures.