Determinatives of the conceptual reconsideration of mine planning principles considering market dynamics and the imbalance between ore extraction and waste rock removal

Abstract

Purpose of the article is to analyze the reasons for the decrease in the efficiency of open-pitdesign due to changes in the mining and metallurgical industry and to justify adaptation measures for dynamic design. The research methodology isbasedonasystematicanalysisofthefunctioningofsuchcomplexandlarge-scalefacilitiesas mining and processing plants and complexes, comparative assessments of the efficiency of their productive activities, as well as causal analysis to determine the root causes of the identified discrepancies and their avoidance. Findings. The main technical and economic indicators of the mining and processing plants of the Kryvyi Rih iron ore basin were considered and analyzed, taking into account dynamic changes, on the basis of which characteristic patterns of trends and fluctuations in the volume of ore and overburden production by plants and individual open-pits were identified; the main reasons that determine them; and also – adjustments to the design concept were proposed, taking into account the temporal factor in its dynamics. The originality. Systemic features and emergence of mining complexes have been identified, which is manifested in the regular alternation of fluctuations in the productivity of open-pits and the dependence of their reaction on internal changes and external factors. On this basis, a new approach to determining the limiting overburden ratio has been proposed and a model for optimizing the production volumes of iron ore products of mining and processing plants has been developed. Practical implementation. The study is devoted to the development of a methodology for determining deviations in overburden operations when changing the productivity of the open-pit for ore and planning mining operations under conditions of fluctuations in demand for iron ore products. The difference of the methodology lies in the ability to quickly adjust the key parameters of the open-pit, taking into account the relationship between the width of the working platform and the length of the active front of the works, which provides a regulatory reserve of ore ready for extraction.