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INFLUENCE OF INTENSITY OF ORE DRAWING ON LOSSES IN SUBLEVEL CAVING IN PERMAFROST ZONE



Underground mining of ore deposits in the north-east of Russia currently features high costs, which affects profitability of ore production. Application of sublevel caving systems enables reduction in costs of ore haulage and ground control as well as considerable improvement of safety and productivity of mine personnel. At the same time, mining in permafrost zone requires taking into account possible adfreezing of broken ore in stopes, which complicates operation. The influence of adfreezing on ore losses was studied at various intensity of drawing and moisture content of ore during sublevel caving. Physical simulation of adfreezing-inclined ore drawing was executed on laboratory test bench, in a cryo-cell reproducing temperature conditions of underground mining in the Nezhdaninsky gold deposit. Ore drawing was carried out from single stope at the temperature of 5–7 ˚С below zero, which conformed with temperature conditions in stopes in permafrost zone. Intensity of ore drawing was varied by increasing quantity of discharge. The experimental drawing was continued until the limiting dilution of 50% per draw batch. The broken ore loss was determined as the difference between the discharged ore quantity and its mass in the test bench. The experimental studies find that under conditions of negative temperatures and varying moisture content of ore from 0 to 1.0%, the increase in the ore draw batch (intensity) by 2 times (from 150 to 300 t/shift) reduces the ore loss due to adfreezing by 14% (from 33 to 19%). Undoubtedly, the research findings are only valid for the specific test conditions. At the same time, they make it possible to estimate qualitatively the change in ore loss in adfreezing in stopes as function of ore drawing intensity in underground mining in permafrost zone. The resultant qualitative dependences of ore drawing intensity and ore loss in adfreezing in stopes will be used in recommendations on improvement of sublevel stoping efficiency in the conditions of permafrost zone.


For citation:  Zubkov V. P., Petrov D. N. Influence of intensity of ore drawing on losses in sublevel caving in permafrost zone. MIAB. Mining Inf. Anal. Bull. 2019;(8):5-13. [In Russ]. DOI: 10.25018/02361493-2019-08-0-5-13.



: 8
2019
ISBN: 0236-1493
УДК: 622.34:658[551.34]:622.831.3
DOI: 10.25018/0236-1493-2019-08-0-5-13
Authors: Zubkov V. P., Petrov D. N.

Authors' Information:
V.P. Zubkov, Cand. Sci. (Eng.), Senior Researcher,
Deputy Director for Science, e-mail: zubkov @ igds.ysn.ru,
D.N. Petrov, Cand. Sci. (Eng.), Head of Laboratory, e-mail: petrovdn74@mail.ru,
Federal Research Centre The Yakut Scientific Centre,
Chersky Mining Institute of the North, Siberian Branch,
Russian Academy of Sciences,
677980, Yakutsk, Republic of Sakha (Yakutia), Russia.
Corresponding author: D.N. Petrov, e-mail: petrovdn74@mail.ru.

Key words:
Underground mining, ore deposits, permafrost zone, sublevel caving, ore drawing, intensity, adfreezing, losses.

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