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The paper discusses the impact of post-mining workings of natural aggregates on hydrographic conditions, including the volume of groundwater resources. The predicted effects of the liquidation of open pits were characterized by two sand deposits located in the river valleys of San and Wis?oka in south-eastern Poland. There are no elements of the natural environment that require special protection against the effects of their exploitation in the deposits area and in their immediate vicinity. In addition, there are ...