Substantiation of field of application of combined (traditional and physicaland-chemical) geotechnologies for the development of gravel and secondary gold depositsArtur Sekisov, Anna Rasskazova, Alexandr Lavrov and Roman BogomyakovE3S Web Conf., 56 (2018) 03011DOI: https://doi.org/10.1051/e3sconf/20185603011