## 2 Materials and Methods  
### Case Study  
The studied case was located on the territory of Siberia in the permafrost zone (Figure 1). The case was the tailing of the processing plant, where waste is stored after diamond mining. The work site was located in the area where the protective dam and the left side of the tailing dump adjoined. According to engineering and geological surveys carried out in 1985-1986 [16], the geological structure of the territory includes deposits of the Upper and Middle Carboniferous of the Kat Formation (C\({}_{2+3}\) kt); the Landoverian of the Lower Silurian (S\({}_{1}\) In); Ordovician deposits of the lower and middle sections of the Sokhsoolokh (O\({}_{1}\) ss) and Kylakh (O\({}_{2}\) kt) suites, overlain by a cover of Quaternary deposits of lacustrine marsh, eluvial-delnuial, alluvial and eluvial genesis. Geomorphologically, the territory of the tailing dump is located in the trough-shaped valley of the Fossil Creek. The absolute elevations of the surface vary on the starboard side from 602.24 to 503.05 m. On the left side, they vary from 609.52 to 503.05 m. The elevation difference was 99.19 and 106.47 m, respectively [16]. In geocryological terms, the study area was located in the area of distribution of permafrost of the merging type with rock temperatures from \(-2.6\) to \(-6.6\)\({}^{\circ}\)C and a thickness of 200 to 600 m. At the time of surveys in 1985, the presence of a buried ice and ice-rich soils. Based on the results of the survey, physical and geological processes and phenomena unfavorable for construction were established, such as kurum, frost heaving, heavily icy soils and buried ice, waterlogging, and tectonic disturbances [16]. Within the site of the enclosing dam, 6 zones of discontinuous faults of various thicknesses were identified. The strike of the zones was 150-160\({}^{\circ}\), the dip was east at an angle of 60-70\({}^{\circ}\). The tailing dump is a hydraulic engineering structure of the I class of solidity, according to the location--beam, according to the method of filling--alluvial. The tailings storage capacity at the final level of 605.0 was 230.2 million m\({}^{3}\). The tailing dump of the processing plant was put into operation in 1996. This concentrating plant processes are mined from the diamond pipe. The design capacity of plant was 10 million tons of ore per year. Tailing dump design parameters:  
* The design length of the enclosing dam at the final filling level was up to 2500 m (1900 m in 2018);
* The design height was 105 m (97 m in 2018). The protecting dam was thawed alluvial. The tailing dump was drainless, full-circulation, with the accumulation of circulating water for the entire period of operation. Studies within the sites of the planned construction of the enclosing and pioneer dams in the right and left sides of the valley of the Fossil Creek revealed zones of tectonic disturbances (crushing). Strike zones were 150-160\({}^{\circ}\), dip 60-75\({}^{\circ}\). The thickness of the zones reached 160-180 m. Figure 1 shows the results of the interpretation of the observed processes of suffusion and zones of tectonic faults, identified as a result of previous geophysical studies and the engineering-geological survey of 1986, carried out by specialists from the mine surveying, geological and hydrogeological services. Figure 1: Satellite image of the study area (the tailings dump is highlighted in a red frame). Analysis of engineering-geological surveys, schemes of tectonic disturbances (Figure 2), allowed us to draw the following conclusions:  
There are fault systems in the base rocks;  
There are several fault crossing nodes in the left bank junction;  
When the fixed suftosion processes and tectonic disturbances are superimposed, a fairly clear correlation can be traced;  
Downstream on the port side, groundwater is currently being discharged;  
The unloading area is located at the intersection of the general and feathering fault zones.