Substantiation of rational parameters for the formation of a filling mass of metallurgical slags on the basis of a complex of laboratory studies and physical modeling for the reclamation of technologically disturbed lands. An integrated methodological approach was used, including sampling, microscopic and X-ray fluorescence analyzes, particle size analysis, laboratory studies of the products of interaction between slags and water, physical modeling of the filling massif, laboratory determination of the physical properties of slags, and numerical modeling of the deformations of the filling massif.