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Hydrogeological features of the quaternary sediments lies in different assumption for the emergence of freatic accumulations of groundwater and the ability to power or, conversely, to some extent seal underlying aquifers. Effect of the opencast mining on activities of quaternary sediments is significant and consists primarily in a drainage effect. In places, where the overburden works crossed saturated parts of the quaternary cover, there is a sudden drainage of aquifers. This water vents are regularly cause unres...