The article entitled Natural and Anthropogenic Conditions of the Chemical Composition of Pit Lake Waters (Based on Example Pit Lakes from Central Europe) by T. Molenda and J. Kidawa, demonstrates how the properties of the catchment (natural and anthropogenic) affect the chemical composition of the water in post-exploitation pit lakes. A classification of the pit lakes investigated in this study is also presented relative to the hydrochemical water type. Although these reservoirs do not have a natural origin, from the moment they are built (flooding the excavation) they begin to undergo the same natural processes as natural lakes. The chemical composition of the water of pit lakes depends on several factors, the most important of which is geogenic, i.e. the type of rocks in which the pit lake basin is located.
The multidimensional clustering of reservoirs due the chemical composition of their waters