Selection of an aggregate quarry mining technology with variable depth and productivity based on cost price

Purpose. To determine an effective technological scheme for mining a quarry of building raw materials with variable productivity and depth of deposit development according to the production cost of crushed stone products. Methodology. The work used a set of research methods: analytical method ‒ to establish the dependence of the production cost of crushed stone products in a quarry of building raw materials on the depth of development and productivity of the enterprise; simulation modeling ‒ to determine the parameters of technological schemes using the necessary excavation, loading, and haulage equipment, as well as the location of the crushing and sorting complex. Findings. It was established that the minimum production cost of crushed stone products in a quarry with an annual productivity of 0.4‒1.6 million m3 is achieved by introducing into the production process a technological scheme using a crushing and sorting unit on the concentration horizon. When comparing two technological schemes using trucks and cyclic-flow technology for quarry development at a depth of 100 m and productivity up to 1.0 million m3/year, the haulage system scheme will be more effective, and with increasing productivity ‒ cyclic-flow technology. When mining a quarry 150 m deep using trucks and cyclic-flow technology, the first technology will be more effective with quarry productivity up to 1.2 million m3/year, and with further increasing productivity ‒ cyclic-flow technology. Originality. The dependence of the manufacturing cost of crushed stone products on the quarry depth and productivity when using three technological schemes has been established. The influence of the mining quarry depth on the cost of obtaining crushed stone products for a depth of 50‒150 m has been determined, which allows us to determine the most effective technological scheme using a mobile crushing and screening plant on the concentration horizon. It was established that when developing a quarry with a productivity of 1.6 million m3/year in the absence of a crushing and screening plant on the concentration horizon, with a quarry depth of up to 76 m, the haulage technology is more effective in terms of the production cost, and with a further increase in depth, the cyclic-flow technology is more efficient. Practical value. Recommendations have been developed for the selection of technological schemes in terms of the production cost of crushed stone products in quarries of construction raw materials, considering the depth of the deposit development and the productive capacity of the enterprise. The technical and economic indicators of technological schemes using haulage and cyclic-flow technology, as well as schemes with a crushing and screening plant on the concentration horizon of the quarry, which are necessary for further establishing the project’s investment attractiveness, have been established.