Szukana fraza: [Abstract = "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."]

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