## 3 Results  
### Interpretation of Resistivity Distribution Maps  
Based on the results of 1-D inversion of the data of areal electromagnetic soundings, maps of the distribution of electrical resistivity of rocks at depths of 20, 30, 50, 65, 75, 100, 125 and 150 m were built. On the resistivity distribution map at a depth of 20 m, technogenic deposits were distinguished by a vast area with a resistance of 9-15 Ohm\(\cdot\)m in the central part of the study area. In the left-bank junction along the coast, a linear zone of low resistivity with a width of 70-130 m appeared. In the area of the enclosing dam, the linear anomaly merged with the areal anomaly of low resistivity from technogenic flooded soils. The linear anomaly of low resistivity was interpreted as a zone of fractures, along which bypass filtration of water occurred in the left bank junction. It was clearly seen that the zone of formation of cracks on the left bank fell on the boundary between low and high resistivity rocks. On the right-bank junction, a linear anomaly of low resistivity appeared fragmentarily along the coastline, along which bypass filtration was likely to develop. In 2019, there was an outflow of water in the downstream on the starboard side at 533 and 531 m.  
At a depth of 30 m, linear filtration zones in the landfalls were more pronounced. A depth of 30 m corresponded to a height of 565 m, at which a crack formed in the downstream at the junction of the dam to the left bank. In addition to the pronounced linear zones of low resistivity, local anomalies of low resistivity (less than 100 Ohm\(\cdot\)m) against the background of reduced electrical resistivity of rocks (250-300 Ohm\(\cdot\)m) stood out in the study area in the tailings contour. The existence of local anomalies was explained by uneven thawing of icy soils at the base of the tailings. At a depth of 50 m, the linear zone of no resistivity in the left bank junction shifted to the northeast, which was caused by its northeast dip. On the right bank of the tailing dump, the linear anomaly of low resistivity remained within the boundaries of the selected contour, which meant its vertical drop. In the central part of the area, there was an area of low resistivity associated with technogenic deposits. It was clearly seen that the rocks along the enclosing dam also had a low resistivity (20-50 Ohm\(\cdot\)m), which was explained by their water saturation below the level of the depression curve. Figure 8 shows the resistivity map at a depth of 65 m. This depth corresponded to a height mark of 530 m, at which a crack formed in the downstream on the left side and groundwater was discharged. Water outcrops were recorded at 520-526 m. At 530 m along the port side, there was a linear zone of low resistivity, probably associated with bypass filtration along fractured rocks. On the right-bank junction at the level of 530 m, local low-resistance anomalies were distinguished, which conditionally formed a linear  
Figure 7: Geoelectric section along profile No. 1 with interpretation elements (1—item TEM and its number; 2—technogenic deposits (tailings); 3—carbonate rocks; 4—fault axes according to TEM data; 5—permafrost boundary according to TEM data; 6—relief surface before the start of filling the tailings). zone. On resistivity maps at depths of 75-150 m, the pronounced linear character of low-resistance anomalies in landfalls gradually disappeared. In the central part of the study area, under the tailings deposits, a low resistivity area was identified, probably associated with a deep talk at the base of the hydraulic structure. The distribution of resistivity over the area acquired a mosaic character, which can be associated both with uneven thawing at the base of the tailing dump, and with interpretation errors, when the influence of the three-dimensionality of the medium was expressed in the appearance of a false underlying layer of high resistivity in a one-dimensional model.