Substantiation of mining systems for steeply dipping low-thickness ore bodies with controlled continuous stope extraction

Abstract

Purpose. The solution to one of the important problems of the underground mining method is to substantiate cost-effective, technologically feasible and safe variants for mining steeply dipping low-thickness ore bodies. Methods. Mining systems are substantiated on the basis of a detailed analysis of the developed and existing experiential variants for mining steeply dipping ore bodies, identifying production and economic disadvantages, as well as their causes. Findings.As a result of the research, the pillar raise performance in the mining system with ore shrinkage has been substantiated. The main parameters of the proposed variants for mining systems with ore shrinkage, intended for expansion-type supports and borehole breaking, have been substantiated. A design has been developed of fastening the material-running raises (MRR) and ventilating raises (VR) on the working and ventilation horizons to ensure their performance in the mining system with ore shrinkage. Originality. For the first time, dependences of dilution and labour productivity on the ore body thickness and the type of ore breaking for blast-hole stoping and borehole breaking for a single and “twinned block” have been obtained. In addition, a certain dependence of the loading and delivery performance on the average fractional composition, as well as on the delivery distance, has been obtained. Practical implications. The research is characterized by scientific innovations created for the first time, which are able to ensure the efficiency and safety of mining operations, while creating the ability to manage the loss of minerals and dilution in the block, as well as reaching their calculated optimal ratio in order to achieve the most cost-effective production rate.

Results of research on the stability of mine workings, fixed by arched supports made of composite materials, in the conditions of the Pokrovske Mine Administration

“…Moreover, at great depths (H > 1000 m), the stress intensity can increase up to 200-250 MPa, and more will be inexpedient. The results obtained do not contradict numerous geomechanical studies [47][48][49][50][51]. This confirms that the models correspond to the real conditions for conducting mine workings in coal mines.…”

Substantiating the operating parameters for an underground gas generator as a basic segment of the mining energy-chemical complex

“…The development and implementation of resource-saving technological processes, which save not only living, but also materialized labor, is an important factor in the development of production at this stage [36][37][38][39]. At the same time, a very important condition is the reduction of total expenses and social production expenses, which are reflected in an integrated form in the cost price of final products [40,41].…”

Simulation of Leaching Processes of Polymetallic Ores Using the Similarity Theorem

“…-investigate the regularities of volumes of mineral extraction from the rock mass. In the process of extraction, the technological parameters are individual for each case (Sala and Bieda, 2019) and have a wide range, so their exact definition significantly affects the cost of the product (Sdvyzhkova et al, 2020;Kalybekov et al, 2020;Rysbekov et al, 2022;Pysmennyi et al, 2022). Finding the values of the technological parameters of leaching is reduced to the successive execution of the following steps:…”