Optimization of position of the cyclical-and-continuous method complexes when cleaning-up the deep iron ore quarries

Abstract

Purpose. An algorithm development for calculating the optimum depth for cyclical-and-continuous method schemes introduction when cleaning-up the deep iron ore quarries.Methods. When developing an algorithm for calculating the optimum depth for cyclical-and-continuous method schemes introduction under the conditions of the Kacharsky mine, abstraction and analytical techniques were used to distinguish the parameters that most significantly influence on the depth value of the cyclical-and-continuous method schemes introduction. The developed algorithm has been applied when constructing a mathematical model based on mining-engineering parameters for cleaning-up the Kacharsky Iron Ore Mine.Findings. An algorithm is presented for calculating the optimum depth to put into operation the railway transport and a conveyor hoister in the cyclical-and-continuous method schemes, taking into account the mining-engineering and economic parameters for cleaning-up the deep quarries in surface mining. It has been substantiated that the transition from a combined automobile-railway to a combined automobile-conveyor-railway mode of transport is economically viable and will expand the limits of the effective use of surface mining of iron ore deposits. It is recommended to restrict the depth of commissioning the railway transport to 149 m, and the conveyor hoister -to 344 m into the cyclical-and-continuous method schemes using automobile-conveyor and automobile-railway modes of transport.Originality. Based on the constructed mathematical model, the dependences have been obtained of the prime costs for transporting the total volume of rocks mined on the depth of the cyclical-and-continuous method schemes introduction under the conditions of the Kacharsky Iron Ore Mine. Practical implications.For the conditions of cleaning-up the Kacharsky Iron Ore Mine, the optimum parameters have been set for the mining-transport scheme of the cyclical-and-continuous method, which ensure the minimum prime costs of the rock mass transportation.

Determining conditions of using draglines in single-tier internal dump formation

“…It is effective in 200 m dumps with flooding of not less than 100 m, in 300 m dumps with flooding of not less than 190 m, i. e. the thickness of nonflooded part is no more than 100-110 m. The procedure of filling the minedout space of an open pit with a depth of more than 150-200 m is proposed as fol lows. To install a dragline excavator on the rocks, on the re loading horizon of the combined internal open pit transport (for automobilerailway transport 150-200 m [19] and auto mobileconveyor transport 270-350 m [20]) which is used to start formation of the internal dump. The movement of the dragline excavator to the new surface working should be car ried out after reaching the level of tier flooding, which will pro vide the stability sufficient for effective use of the equipment.…”

Justification of the hydro-mechanical systems operating modes, used for restoring accumulation capacity of tailings storages

“…Due to the long length of the hydrotransport lines and significant differences in geodetic heights, the use of paste thickeners in the mining and processing plants (MPP) of Kryvbas is impossible. These technologies are implemented at new TSF where waste is placed in the first tier [4][5][6][7]. Intensification of wastewater treatment process in clarifiers by adding chemical agents significantly accelerate sedimentation process, however, deteriorates the sediment properties.…”

“…Therefore, all Kryvbas MPPs are forced to use a single well-known technology for increasing the accumulation capacity -to raise the embankment. This approach increases the number of waste tanks, but reduces the size of clarification pool, and threatens the impossibility of proper clarification of recycled water [5][6][7][8][9][10]. In the near future, their extensive development relying on using additional volumes of recycled water, expansion of areas and building of new TSF, will become impossible.…”

Mine planning subject to prepared ore reserves rationing

“…On the open mining operations example in solving the block planning task, the approach based on dividing the pit mining into separate stages with establishment for each stage of its optimal contours using the algorithm proposed by Lerchs and Grossman (1965) [4] is preferred. In the subsequent improvements and many interpretations of this method from various authors modified the optimization classical problem with different variants and combinations of constraints and variables to solve the planning problem [5][6][7][8][9][10][11][12]. The resulting tasks are solved using standard integer programming IP algorithms.…”