Effect of coal mining depth on drilling-and-blasting performance at Uralugol

It is proposed to determine the weighted average of a drilling-and-blasting bench as an arithmetic average of a bench of a certain height, including the volume of broken rock mass on each addend bench for which this average number is calculated. The found weighted average is correlated with the specific operating cost of rock preparation for blasting and with the yield of rock mass per one running meter, and is meant to facilitate justification of rational drilling-and-blasting parameters. The value of the weighted average grows with increasing depths of mining, as a rule. In calculation of the weighted average of a bench, a pit wall is conditionally depth-ward divided into the same height benches, and each bench is given an ordinal number starting from ground surface. An extraction block is attached to a bench number based on the elevation of the bottoms of the longest boreholes in the block. It follows from mining practice that the target position of mining operations by the end of a reporting period seldom coincides with the actual position. Such situation is often connected with organizational conditions. The drilling-and-blasting parameters and operating costs of first works change accordingly and mainly increase as mining depth grows. Incidentally, justification of stripping and actual mining costs becomes complicated. To help mining engineers and to facilitate correct justification of drilling-and-blasting parameters and cost, the weighted average of drilling-and-blasting bench is proposed to be used at deposits with linear dependence of properties of rocks on mining depth.

Galimyanov A. A., Sobolev A. A. Effect of coal mining depth on drilling-and-blasting performance at Uralugol. MIAB. Mining Inf. Anal. Bull. 2021;(12–1):69—75. [In Russ]. DOI: 10.25018/0236_1493_2021_121_0_69.

Galimyanov A. A.¹, Cand. Sci. (Eng.), senior researcher at the Laboratory of Geotechnology and Mining Thermophysics, azot–1977@mail.ru
Sobolev A. A.¹, Cand. Sci. (Eng.), head of the international department, sobolev@khfrc.ru;
¹ Mining Institute of the Far Eastern Branch of Russian Academy of Sciences, 51 Tufgenev str., Khabarovsk, 680000, Russia.

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