Abstract

Almost all post exploitation open pit mines in the world are shaped as a final reservoir intended to be filled with water. In Europe, the creation of water lakes is the most common way of reclaiming post open pit mines. The safety and the security of mine lakes is one of the priorities of mine regions. One of the main hazards identified is the slope stability of lake banks. To develop a reliability methodology for assessing the long-term stability of flooded open pit mines, a large-scale numerical model of the lake was carried out and was applied on Lake Most, which is one of the largest mining lakes in Europe (Czech Republic). The large-scale numerical model was built, based on the site observations, large scale LiDAR data and geotechnical data. The results highlighted the reliability of the methodology to combine the geometric model with the geological model to create a large-scale numerical model, and to identify local and potentially instable zones.

Highlights

  • Introduction and ObjectiveAlmost all post exploitation open pit mines in Europe and in the world are shaped as a final reservoir intended to be filled with water

  • The results of the 2D and 3D numerical modelling were analyzed as large scale by calculating global and local safety factors

  • The results highlighted the reliability of the methodology to combine the geometric, geological and hydraulic models to create a large-scale numerical model, and to identify local and potentially instable zones

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Summary

Introduction and Objective

Almost all post exploitation open pit mines in Europe and in the world are shaped as a final reservoir intended to be filled with water. These artificial lakes are currently (and in the future) dedicated to recreational purposes including energy installation purposes (SUMAD RFCS project). Slope instability is the major long-term hazard. The stability of pit lake slopes after flooding remains an area of uncertainty. Lake Most (located below the hill Hnevín) was formed on the site of the former royal town of Most, which had to give way to brown coal mining in the second half of the 20th century.

Long-Term Slope Stability
Hydraulic Data
Conclusions

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