A brief description of the ore deposits occurring in Ukraine is presented. The iron-ore deposits of minerals which are extracted by underground mining method are highlighted, with emphasis on two specific deposits with deep mineral formation, and the main part of the lecture is based on these deposits. General information about these deposits and technologies of ore extraction are provided. Companies selected for analysis are as follows: JSC “Kryvyi Rih Iron Ore Integrated Plant” (KRIOIP), Kryvyi Rih, Ukraine, which includes the mines “Ternovska” (shaft depth 1441 m), “Hvardeyska” (shaft depth 1310 m), “Oktyabrska” (shaft depth 1524 m) and “Rodina” (shaft depth 1580 m); PJSC «Zaporozhskiy Iron-Ore Combine», Dniprorudne, Ukraine (ZIOC), which includes mine “Eksplutaatsiyna” (shaft depth 970 m). On the example of these enterprises and their mines, the specific features of mineral deposits occurrence are considered, as well as extraction rate, specific features of the mining method and the rate of development automation. A brief analysis of commonly known features of ore deposits development (mining and geological and technological features, rate of automation) is given and their connection with deposits mentioned above. Mining-geological and technological features of iron ore development are described in detail. We are going consider the rate of automation only in methods of drilling wells involved in the stoping works. In this connection, modern drilling equipment is being used, which is used for the stoping works, globally, and for the specified conditions in particular. Typical specification of drilling work and its constituent elements are considered: wells layout, their quantity, type and consumption of explosive substance, method of well loading and explosion initiating, etc. Special attention is focused on the description of explosion by means of wells ring. Information on blasting operations is provided, including the way the charges are initiated, their structure, charging method and composition of explosives, indicating the economic indexes of these works. We suggest watching a brief video on blasting related to the above mentioned material. Next, we consider ways of selecting and substantiating the mining methods, their parameters, the dependence of the choice of a mining method on the aggregated list of criteria (mining and geological conditions, ore grade, mining depth, etc.). The choice of rational parameters of the ore deposit mining method is considered, and the mining method (drawings and description) that are adopted and used in the ZIOC and KRIOIP are provided. We suggest getting acquainted with the ore grade, depending on the type of minerals, and defining the commercial value of ore deposits (with students), as described above. The index of extraction of ores is taken into account in the total amount of stocks, and brief information on the extraction of related minerals in the development of iron ores is given.
LECTURER: Dmytro Maltsev (Dnipro University of Technology, former National Mining University, Ukraine)