Ecological vindication of the nonmetallic construction materials mining from river beds (the Pripyat River as a study case) by Aleksandr A. Volchek, Sergey I. Parfomuk, Nikolay N. Sheshko, Natalia N. Shpendik, Denis N. Dashkevich, Svetlana V. Sidak, Mikhail F. Kukharevich