Abstract
Purpose. Scientific substantiation of the expedient depth of mining the non-metallic deposits of rocky minerals on the basis of mathematical and statistical methods, which will ensure resource-saving and rational use of natural resources. Methods. To solve the purpose set, the following methods are used: graphical-analytical – when optimizing the maximum depth of mining the deposits of building materials, and the method of mathematical modeling – for determining the maximum depth of mining the non-metallic deposits with internal dumping. By means of statistical processing according to systematized types of deposits, the patterns of a change in the maximum depth of mining the basic deposits, depending on the main parameters of the quarry field, have been studied. Findings. A new methodology, which is distinguished by taking into account in-pit dumping, has been developed for calculating the maximum depth of granite quarries, which most of all influences the efficiency of mining operations and the value of economic indicators while ensuring the maximum economic effect with the achievement of a rational maximum depth of mining the deposit. A new, theoretically substantiated methodology has been created for determining the maximum depth of mining the mineral deposits for the production of crushed-stone products while providing the resource- and land-saving during the quarry operation. Originality. For the first time for these deposits, the dependence of their maximum mining depth on the main parameters of the quarry field and the place of internal dumping of overburden rocks has been determined. This has become a determining factor in the appropriate mining of deep non-metallic deposits of building materials with internal dumping, which provides a minimal land disturbance. Practical implications. The research results have been tested and implemented in working projects for mining the Liubymivske, Chaplynske, Pervomaiske, Mykytivske, Trykratske and Novoukrainske granite deposits; as a result of additional mining of mineral reserves, their additional increment in the volume from 1 to 48 million m3 is possible, which will ensure 5-40 years of sustainable operation of the mining enterprise.
Highlights
In the practice of designing the indicated deposits of py-Ukraine is one of the leading places in the world in terms of reserves of rocky non-metallic raw materials suitable for the production of building materials
Rogenetic and metamorphic rocks, their maximum mining depth is limited by many parameters: the depth of the explored mineral reserves; increased groundwater inflow at a great depth, which leads to a sharp increase in the cost of water-removing and drainage; built-up area adjacent to the quarry fields, which limits their spatial dimensions; possible increase in radioactivity of minerals with depth; small transverse dimensions of igneous rock deposits [4]-[6]
It can be concluded that the depth of internal dumping to the greatest extent influences on the maximum depth of mining the quarries with low and medium thickness of overburden rocks
Summary
In the practice of designing the indicated deposits of py-Ukraine is one of the leading places in the world in terms of reserves of rocky non-metallic raw materials suitable for the production of building materials. Most fields of sedimentary building materials are mined to a depth of 80-120 m to the deposit bottom using the technology with internal dumping. Rogenetic and metamorphic rocks, their maximum mining depth is limited by many parameters: the depth of the explored mineral reserves; increased groundwater inflow at a great depth, which leads to a sharp increase in the cost of water-removing and drainage; built-up area adjacent to the quarry fields, which limits their spatial dimensions; possible increase in radioactivity of minerals with depth; small transverse dimensions of igneous rock deposits [4]-[6]. A significant number of more than 300 quarries of igneous rocks in Ukraine have reached their design depth. There is no possibility to expand the quarry field boundaries
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