The economic efficiency of the enterprise and the length of its operation, the full utilization of mineral reserves and the total cost of operation depend on the selected depth and boundaries of opencast mining. In such conditions of the deposits' development it is necessary to evaluate the capabilities of the raw material base for the further development of the mining enterprise. The basis for determining of the border overburden ratio is on the condition that the price of manufactured marketable output of the designed enterprise should not exceed the price of the same marketable output in the world market. The realization of this condition is achieved analytically. This takes into account the impact of the rate of return on the final depth of the designed open pit. A new method of determining of the border overburden ratio is developed, which ensures the competitiveness of iron ore concentrate in the world market. The value of the border overburden ratio is developed for the Pershotravnevij open pit of the Northern mining and processing plant, depending on the situation of the iron-containing products' prices, which ensures the competitiveness of marketable iron-ore output in the domestic and world markets.

Further development of the open mining works on the domestic enterprises will be accompanied by the worsening of mining-geological conditions and declining of the quality of iron ore raw materials. In the same time, the accumulated mining wastes, that can make the technogenic deposits, pass into one of the important sources of the mineral raw materials. Taking into account this thing, the development and implementation of the modern technological circuits of the technogenic deposit development is an actual calling for mining industry, and determination and optimization of process conditions of the technogenic deposit development -is the scientific task of this publication. The obtained results of studies of the optimum step value of the ore chute transfer during the technogenic deposit development can be used by design organizations and mining enterprises for designing works. The obtained methodology and the proposed mathematical dependencies will reduce the cost of mining of the technogenic deposit due to the reasonable timely transfer of the open ore chute.

The article considers the determination of the final contours of the open pits. One of the problems of development of iron ore deposits at the present stage of development of opencast mining is described, which consists in the fact that in most open pits their working contours on the surface have reached final position. In these conditions, it is necessary to reevaluate the capabilities of the raw material base for further operation of mining enterprises. The analysis of scientific achievements in the decision of the final definition of the open pits` contours is executed. The well-known principle of determining the boundaries of opencast mining, the principle of which is to determine the boundaries based on a comparison of the allowable cost of ore production with the expected for the designed open pit. On the example of the open pits, which reflect the characteristic features of the development of steep-dipping deposits of Ukraine, the influence of current overburden ratio of the existing open pits on the economic overburden ratio, which serves as the main criterion in determining the boundaries of opencast mining for the designed open pits. A method for determining the boundaries of the open pits has been developed, which provides for the use of the economic overburden ratio of opening as a value not constant but variable over time, and one that depends on the change of current coefficients of opening in open pits-competitors. As a result, the theory in the field of determining the final contours of the open pits is improved. The new method differs from the known ones by taking into account the change in the economic overburden ratio over time, as well as determining the impact of technological indicators of open pits - competitors on the final depth of the designed open pit.

Purpose. The state of open-pit mining, formed at Ukrainian enterprises, as well as the state of the mineral raw materials market require the search for new, more economically feasible approaches to open mining operations. Such a solution is the widespread use of cyclical-streaming technology. The aim of the paper is to research the interconnection between the main technological parameters of cyclical-streaming technology. Scientific novelty. In the paper relationships are established and the rational values of the parameters of the cyclical-streaming technology are determined, which contributes to improving the economic indicators of deposit development. Practical significance. The mathematical modelling of the main parameters of the cyclical-streaming technology is fulfilled. The obtained results of studies of the main parameters of the cyclical-streaming technology can be used by project organisations and mining enterprises in the design. Research results. The comparison of optimal indicators of operation of the excavator-automobile complex and cyclical-streaming technology is performed, as a result of which the economic expediency of the latter was confirmed. It has been established that increasing the carrying capacity of more than 136 tons at the current level of development of machinery and technology in iron ore open-pits in most cases is not appropriate. At the same time, the influence of the efficiency of the excavator unit on the performance of the cyclical-streaming technology in general was investigated. As a result, it was established that the best technical and economic indicators will be reached using the EKG-10 excavator. In this case, the geometric capacity of the dump truck body must correspond to the capacity of the bucket, and the load capacity is up to 130 tons. Thus, the study confirms the technological parameters of the cyclical-streaming technology that have been developed in the open-pits of the mining and processing plants of Kryvbas region.

The aim: The current states of open mining works at domestic enterprises, as well as the situation in the market of mineral resources require the search for new approaches to open mining works. This approach is a comprehensive development of mineral resources, which contributes to the improvement of technical and economic performance indicators for the mining enterprises. Purposeful formation of manmade deposits with the necessary parameters and their further development is one of the main directions of complex development, and the definition of these parameters and the study of their relationships is the scientific task of this publication. Methods: The methods of patent search, analysis of literary sources were used to study the technology of formation and development man-made deposit, regression analysis and mathematical modeling of the main parameters of man-made deposits. Object of research: man-made deposits of bulk type Subject of research: the relationship of the parameters of man-made deposits Scientific novelty. The dependences of the optimum values of the capacity and production capacity of the man-made deposit, which provide the best technical and economic indicators of the formation and development of the man-made deposit, are investigated in the work. It is proved that the specific cost of formation and development of man-made deposit are directly dependent on its capacity and inverse-on the production capacity. It was found that the capacity of the man-made deposit has a greater influence on the specific cost of formation and development of the man-made deposit, than its production capacity. Mathematical modeling of the main parameters of the man-made deposit was performed. Practical significance. The results of studies of the main parameters of manmade deposits can be used by design organizations and mining enterprises in the design. Mathematical dependencies will allow to determine more fundamentally the main parameters of man-made deposit and will increase the accuracy of technical decisions of design institutes.