Energy-based concept for calculating explosive weight in open pit mining given variable physical and mechanical properties of rocks

In the conditions of reduction of cut-off grades and complication of geological conditions, it is required to undertake optimization of mining process. Emphasis should be paid to drilling and blasting as their cost reaches 30–35% of overall mining expenses. It is known that drilling and blasting designs in the conditions of rock mass of a complex geological structure include either maximal or averaged data on the strength properties of rocks, which results in the overstated consumption of explosives per blast. An advanced approach to the in-situ determination of rock strength is the MWD technology. However, the variable parameter of drilling and blasting in this technology is only the explosive energy. The value of the explosive energy at a deposit of a complex geological structure, including zones of seasonal and ever frozen subsoil, depends on the energy taken by fragmentation of each layer of different-strength rocks. The authors carried out the research work at mineral deposits in Yakutia and obtained a linear dependence between the reference energy inputs spent for rock fragmentation by blasting and the hardness factor of rocks. The algorithm is proposed for calculating explosive weight for blasting blocks composed of rocks having different physical and mechanical properties. The algorithm provides calculation of such explosive weight that ensures the optimized fragmentation for the overall production benefit.

Vinogradov Yu. I., Khokhlov S. V., Zigangirov R. R. Energy-based concept for calculating explosive weight in open pit mining given variable physical and mechanical properties of rocks. MIAB. Mining Inf. Anal. Bull. 2024;(6):50-68. [In Russ]. DOI: 10.25018/0236_ 1493_2024_6_0_50.

Yu.I. Vinogradov¹, Cand. Sci. (Eng.), Assistant Professor, Senior Researcher, ORCID ID: 0000-0001-9468-2214,
S.V. Khokhlov¹, Cand. Sci. (Eng.), Assistant Professor, Assistant Professor, ORCID ID: 0000-0003-1040-8328,
R.R. Zigangirov¹, Graduate Student, e-mail: s215070@stud.spmi.ru, ORCID ID: 0000-0003-4876-3456,
¹ Empress Catherine II Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

R.R. Zigangirov, e-mail: s215070@stud.spmi.ru.

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