Cherniaiev O. Substantiating the depth of mining the non-metallic hard-rock fields with internal dumping

The thesis on competition of a scientific degree of candidate of technical Sciences in the specialty 05.15.03 – “Surface Mining” (184 – Production and Technology). Dnipro University of Technology, Dnipro, 2021. The paper provides an overview of existing non-metallic quarries extracting raw materials for the production of crushed stone products, as well as an analysis of natural, technological and social factors influencing the depth of mining the granite and other non-metallic hard-rock building materials. The criteria for optimizing the maximum depth of mining the non-metallic fields of hard-rock minerals with internal dumping of overburden rocks have been substantiated. The methodology for calculating the maximum depth has been improved, which is distinguished by taking into account mining-and-geological parameters that most of all influence on the efficiency of mining operations and the value of economic indicators while ensuring the maximum economic effect with the achievement of a rational depth of mining the deposit. The parameters of 117 non-metallic fields of magmatic and metamorphic origin have been analyzed with the purpose of their systematization. When developing the systematization, the area of fields and the thickness of the overburden rocks are accepted as the main classification criteria. Taking this into account, three main groups of quarries are identified by the area of fields: large, medium and small area. When analyzing the indicators of the overburden rock thickness, three main types are identified, which differ in the average thickness of the overburden rocks: low, medium and high thickness. The use of the proposed basic quarries of granite and stone raw materials made it possible to conduct research with a high degree of correlation between theoretical and practical results. This is important when using resource-saving technologies at existing mining enterprises producing building materials.