## 1 Introduction  
Wastes from mining and processing enterprises become sources of environmental pollution, including due to the oxidation of finely divided tailings of ore enrichment with air and water oxygen with the formation of mineralized drainage waters [1; 2; 3; 4]. In addition, the processes of interaction \"water-tails\" in the conditions of the Far North often lead to the thawing of permafrost soils, the formation of technogenic talks, and the leakage of technogenic waters, which, in the presence of fault zones, leads to the development of filtration channels [5]. During the operation of the processing plant of the diamond mining enterprise since 1996, the permafrost soils of the landfalls both on the left and on the right side of the tailing dump have thawed, through which, starting from the period 2000-2001, leakage of significant volumes of circulating water into the lower shunting tank was recorded. The development of filtration channels in the fractured tectonic zones that make up the near-edge mountain range does not stop [1; 2; 3; 4]. Prevention of a dangerous development of the situation at the tailing dump requires additional research, as well as the development of technological solutions for the maximum possible elimination of filtration channels [5; 6; 7; 8]. The solution of these problems will not only ensure the environmental safety of the tailings operation, but also reduce the costs of its operation, which are largely determined by the energy costs for the return of circulating water leaks from the shunting to the main tailings storage. Geophysical methods allow solving a wide range of problems. In particular, in geoe-ecology, geophysical methods are used to optimize the monitoring system of technogenic systems by reducing the number of samples taken for geochemical studies, assessing the resources of useful components, and delineating the distribution zones of underground drainage flows [9; 10]. To control the state of tailings and to prevent emergency situations, it is advisable to use geophysical research methods. Since Soviet times, geophysical methods were widely used in the construction and operation of hydraulic structures. As for regime geophysical observations, they are not carried out on the vast majority of hydraulic structures located in the northern and northeastern regions of Russia, where permafrost soils are widespread (\(\approx\)65% of the total territory of the country). An exception to the general rule is objects that are in the sphere of influence of PJSC (public joint-stock company) Alrosa and some foreign companies [11; 12]. This study explored the determination of filtration zones in soil dams by electromagnetic sounding method(TEM method). Main advantages of the TEM method--the absence of galvanic grounding, the possibility of working in winter, the locality of research, the absence of a shielding effect from the upper high-resistance frozen horizon [13; 14]. The criterion for distinguishing thawed rocks against the background of frozen ones is their low electrical resistivity. The resistivity of thawed rocks depends on the lithological composition, humidity and mineralization of pore moisture. The same parameters determine the resistivity of frozen rocks, but their temperature is the main factor [12]. In the study area, thawed technogenic soils (tailings) are widespread, which are represented by medium- and fine-grained sands, gravel, as well as alluvial sandy loams and weakly permeable, saline clays. The base of the tailings and landfalls are composed of carbonates--limestones and marts, the resistivity of which will depend on the degree of their fracturing, frozen or thawed state. According to the results of many years of research using the method of electrical tomography, within the boundary dam and the left bank junction, the resistivity of rocks varies in a wide range--from 10 to 10,000 Ohm-m [15].