Substantiation of ways to reclaim the space of the previously mined-out quarries for the recreational purposesTursyn Kalybekov, Manarbek Sandibekov, Kanay Rysbekov and Yryszhan ZhakypbekE3S Web Conf., 123 (2019) 01004DOI: https://doi.org/10.1051/e3sconf/201912301004