The article is devoted to the problem of reducing the dilution of metal ore by overlapping and enclosing rock in the production process in underground mining. Some information is given about the state of knowledge of production quality management processes under the development systems with a collapse of ore under the overlapping rocks. Development results are introduced of a complex field structure under a flexible tree-rope and steel cable overlappings. The practice in the application of overlappings of different structures depending on the conditions of development in the uranium-mining industry is described. Overlappings strength determination methods are systematized and typified. For the conditions of polymetallic deposit, economic-mathematical comparison of alternatives with the collapse of the core technology and under the overlapping is fulfilled. The problem of improving the quality indicators of the produced ore are formulated through the separation of ore and rock by the overlappings, including the substantiation of the separation efficiency, optimization of overlappings design for each type differentially, the release of lost ore under the overlappings effectiveness determination, and overlappings structure development. The article systematizes the engineering methods of reducing dilution magnitude with the release of the previously lost ore which are applied in ore mining, also by means of load-bearing and separating overlappings application. It is predicted that the prospects of the direction include bridges cost-cutting through the development of new composite materials. It is shown that improving the quality of previously lost produced ore and ore extracted with overlappings is an essential element of expanding raw-mineral base and mining enterprises economic rehabilitation. The results of the study are of interest to some existing mining enterprises and some mining enterprises under construction.
The purpose of the given work is to substantiate the possibilities of strengthening the potential of depressed mining enterprises during metals underground mining by the example of the North Caucasian region. The methodology of the given work synthesizes theory and practice of the use of technologies, experiments on metals leaching, and economic estimation of technologies efficiency by means of comparing mineral recovery rate factor using alternative techniques. The article substantiates the priority of combining technologies of poor ores leaching and traditional technologies of rich ore mining. The analysis is fulfilled of mixed technologies application underground mine for commercial ore production, which is the first of a kind in the world practice. The basis for combining traditional and new technologies of ore recovery is examined by means of combining technologies within the limits of a single process. The model of identifying ecological and economic efficiency of deposits exploitation is suggested; the account of the recovered resources completeness lies at the heart of the model. The article introduces the example of determining recurrent extraction ratio when using mixed technologies. Results field of application includes formerly subsidized mining enterprises, which develop metal ore deposits using underground method. Revitalization of profitable metal production at depressed mining enterprises is possible on the basis of traditional and new leaching technologies combination.