THE FORECAST OF THE HYDRODYNAMIC AND HYDROGEOCHEMICAL MODES UNDER CONDITIONS OF DESIGNED TAILING CONSTRUCTION AND OPERATION
DOI:
https://doi.org/10.32782/tnv-tech.2023.4.26Keywords:
Irshansk mining and processing plant, tailings, containment structures, hydrodynamic mode, groundwater flow, transportAbstract
The research was conducted to assess the conditions of the planned construction of the tailings dump of the Irshansk mining complex and its impact on the hydrodynamic and hydrogeochemical modes of the aquifers in the adjacent territory. The subject of the study is the groundwater flow and transport processes in the soil massif and in the enclosing structures at the site of the planned construction of the Irshansky tailings dump. The purpose of the study is to predict changes in the hydrodynamic and hydrogeochemical modes of the tailing’s storage facility construction site in terms of its operation. The analysis and generalization of data on geological-hydrogeological and geotechnical conditions of the tailings section territory of the Irshansk mining and processing plant were performed, numerical groundwater flow and transport models of the territory were developed using Modflow software. The forecast of changes in the hydrodynamic and hydrogeochemical modes on the area of tailing containment structures was performed under the conditions of its operation. In the case of the filling the tailing dump to the level of 190.0 m with the height of the surrounding embankments of 10.5 m, the groundwater level will rise up to 2.0 m or more, directly around the tailing dump, and as a result, will lead to flooding and inundation of the adjacent area at a distance of 500 to 1000 m. The estimated changes in the hydrogeochemical state of the adjacent territory are characterized by the development of groundwater zones with high salinity and sulfate ion concentration, resulting in the advancement of their contours towards the river system mainly within the fractured zone of crystalline rocks. At the same time, the total content of dissolved solids and sulfate ion along the contour of the Dobrynka and Trostianytsia rivers as well as the Rihta river’s right tributary is below, 500.0 and 300.0 mg/l, respectively.
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