## 4 Discussion and Conclusions  
On the area of the tailings of the enrichment plant, areal soundings were carried out using the TEM method in order to obtain information about the engineering and geological conditions of the territory, sufficient to assess and predict changes in these conditions. The objectives of the research were to determine the position of fault zones under technogenic deposits and in lateral junctions, to identify the proposed filtration zones.  
As a result of the analysis of resistivity distribution maps, the following was established:  
1. In the left bank junction at depths of 20-50 m, a linear anomaly of low resistivity was revealed, which was interpreted as a zone of bypass filtration. Its width was 50-100 m, the dip was northeast, at an angle of 75-80\({}^{\circ}\). At a depth of 75-100 m, this zone was  
Figure 11: Layout of faults and filtration zones, as wells for injection of plugging composite. 1—wells; 2—dips (a) and cracks (b); 3—filtration zones in landfalls; 4—filtration zone at the base of the tailing dump and thawing depth; 5—faults; 6—recommended control wells; 7—wells for injection of plugging composite; blue line—contour of the tailings dump.  
distinguished fragmentarily. Beach subsidence and suffusion funnels formed along this zone in 2018.
2. In the right bank junction on the resistivity maps at depths of 20 and 30 m, a linear anomaly of low resistivity 50-100 m wide was also distinguished. At a depth of 50 m and below, this zone became fragmented. A slight shift in the position of the anomaly in plan at different depths showed that the dip of the zone was close to vertical or southwestern at a steep angle (85\({}^{\circ}\)).  
The resistivity of technogenic deposits at depths of 20-75 m varied from 9-18 Ohm\(\cdot\)m to 45-100 Ohm\(\cdot\)m. In the landfalls along the 605 m mark, the resistivity of the rocks reached 500-2000 Ohm\(\cdot\)m, which is a sign of their frozen state.  
In the places where dips formed in 2019 along the right bank, their direct connection with linear resistivity anomalies was not revealed. It was assumed that sinkholes were formed in places where ice-cement melts in the carbonate eluvium, as well as syngenetic massive ice in beach tailings. Well No. 1, drilled in the sinkhole, did not open a flooded fault, along which intensive water filtration and its discharge in the downstream were assumed. Therefore, the mechanism of water leakage is somewhat more complicated than previously thought. Probably, the thawed gravel eluvium played the role of drainage, through which water was filtered into the fault zones.  
A three-dimensional geoelectric model made it possible to form a holistic view of the structure of bypass filtration zones in the right and left bank junctions. A diagram of the location of faults and filtration zones, as well as the choice of injection sites for plugging compositions, compiled on the basis of engineering geophysical studies, was presented.  
Conceptualization, K.T. and N.Y. ([PERSON]); methodology, N.Y. ([PERSON]), N.S. and V.O.; validation, K.T., N.Y. ([PERSON]) and T.K.; formal analysis, N.Y. ([PERSON]); investigation, K.T., N.Y. ([PERSON]), T.K., N.S. and V.O.; resources, N.Y. and V.O.; data curation, K.T., N.Y. ([PERSON]) and T.K.; writing--original draft preparation, N.Y. ([PERSON]) and N.S.; writing--review and editing, K.T. and N.Y. ([PERSON]); visualization, K.T., N.Y. ([PERSON]) and V.O.; supervision, N.Y. ([PERSON]); project administration, N.Y. ([PERSON]); funding acquisition, N.Y. ([PERSON]). All authors have read and agreed to the published version of the manuscript.  
This research was funded by Ministry of Education and Science of Russian Federation, grant number FWZZ-2022-0029.  
Not applicable.  
Informed Consent Statement: Informed consent was obtained from all participants involved in the study.  
Data Availability Statement: Data are available upon request to the corresponding author.  
The authors declare no conflict of interest.