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Risk assessment of open pit lake using in situ observations and advanced numerical modelling - application on Most lake

Renaud Vincent, Al Heib Marwan, Burda Jan

Górnictwo Odkrywkowe

2022

R. 63, nr 4

16--22

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 mine regions priorities. Several hazards related to mine activities should be assessed. Qualitative and quantitative approaches were suggested based on the existing data. 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 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 potentially instable zones..

Niemal wszystkie poeksploatacyjne wyrobiska odkrywkowe na świecie są ukształtowane jako wyrobiska końcowe przeznaczone do napełnienia wodą. W Europie tworzenie zbiorników wodnych jest najpowszechniejszym sposobem rekultywacji kopalń odkrywkowych. Bezpieczeństwo i ochrona jezior pokopalnianych jest jednym z priorytetów regionów górniczych. Należy dokonać oceny kilku zagrożeń związanych z działalnością górniczą. Na podstawie istniejących danych zaproponowano podejście jakościowe i ilościowe. Jednym z głównych zidentyfikowanych zagrożeń jest stabilność zboczy wzdłuż brzegów jezior. W celu opracowania metodologii długoterminowej oceny stabilności zalanych kopalń odkrywkowych wykonano wielkoskalowy model numeryczny jeziora i zastosowano go na jeziorze Most, które jest jednym z największych jezior pogórniczych w Europie (Czechy). W oparciu o obserwacje terenowe, wielkoskalowe dane LiDAR oraz dane geotechniczne zbudowano wielkoskalowy model numeryczny. Wyniki podkreśliły wiarygodność metodologii łączenia modelu geometrycznego z modelem geologicznym w celu stworzenia wielkoskalowego modelu numerycznego oraz identyfikacji lokalnych potencjalnie niestabilnych stref.

Erkenntnisse aus der sanierung von stark sauren und sulfathaltigen tagebauseen am beispiel des tagebausees gräbendorf

Koch R.

Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski

2007

nr 133 (13)

203-216

Conclusions from the restoration of heavily acid and sulphate-containing mining lakes using the Gräbendorf mining lake as an example. With Lusatia's 16 open-cast mines till the year 1990, groundwater lowering to a depth of approx. 100 m below ground level has had considerable impacts on the situation in Lusatia as far as water management is concerned. After the closing of the open-cast mines they filled again with groundwater. The water qualities of the existing mining lakes and of those that are still to be created are often characterised by low pH values and high iron and sulphate concentrations, which, if not treated, may lead to a number of subsequent ecological and economic problems. Therefore different restoration technologies are applied to improve water quality sustainably. With 425 hectares the lake Gräbendorfer See is a mining like of medium size in which the restoration procedure applied is flooding by water imported from the river Spree. Doing this, potentials and limits of flooding with imported water have been illustrated. Therefore for sustainable restoration subsequent measures are required. The results achieved and the measures required in the future are documented and prepared / analysed / processed in a German-Polish INTERREG III A project: Presentation and assessment of the application of restoration procedures for the improvement of the water quality in mining lakes as well as of the groundwater in the euro-region and the lebusa land, which have been influenced by mining". This project will be implemented as a mirror project, i.e. each party has selected an appropriate mining lake for it. Thus we can exchange experience and technologies and, on the basis of this feasibility study (qualified task), can also tackle the joint restoration of further mining lakes.