Environmental and economic assessment of the possibilities to increase the land preservation level in terms of open-pit miningYevheniy Babets, Yevheniy Terekhov, Taras Mormul, Iryna Melnikova and Vitalina KomirnaE3S Web Conf., 280 (2021) 11002DOI: https://doi.org/10.1051/e3sconf/202128011002