Impact of blasthole blasting on pillars and enclosing rock mass during hybrid opencast/underground mining at the Jerui deposit

For the conditions of blasthole blasting during hybrid opencast/underground mining at a stockwork gold ore deposit, it is found how explosions influence propagation of induced damage zones in rock mass. During blasting, three zones are formed: I–disintegration (failure); II–induced fracturing; III–induced micro-fracturing. Propagation of disintegration zone I during blasting in underground mining is to be known to adjust drilling and blasting patterns and design—distances from perimeter blasthole to a project perimeter of a mine opening or distances between the main and slotting blasthole charges. Propagation of induced fracturing zone II is important for the assessment of impact exerted by an explosion on the stability of rock mass with induced fractures in opencast mining, particularly, at the ends of vertical and inclined blastholes from the viewpoint of the zone extent in the crown pillar, from the boundary of the maximal depth of an open cast. In underground mining, the propagation of zone II depthwise enclosing rock mass is also critical (integrity of rib pillars to be cut later is damaged). In zone III, induced micro-fractures improve poroperm properties of rock mass, permeability, flow of fluids, for instance, water, etc.

Chuprin K. E., Mansurov V. A., Babkin E. A., Eremenko V. A., Kosyreva M. A. Impact of blasthole blasting on pillars and enclosing rock mass during hybrid opencast/underground mining at the Jerui deposit. MIAB. Mining Inf. Anal. Bull. 2025;(7):5-23. [In Russ]. DOI: 10.25018/0236_1493_2025_7_0_5.

K.E. Chuprin¹, Deputy CEO on Production, e-mail: chuprin.ke@alliance-altyn.kg,
V.A. Mansurov¹, Dr. Sci. (Phys. Mathem.), Professor, Counsellor to CEO, e-mail: geomans43@gmail.com,
E.A. Babkin¹, Head of Geotechnical Engineering Service, e-mail: babkin.ea@alliance-altyn.kg,
V.A. Eremenko², Dr. Sci. (Eng.), Professor of the Russian Academy of Sciences, Director, Professor,
M.A. Kosyreva², Cand. Sci. (Eng.), Engineer, e-mail: marinkosyreva@gmail.com,
¹ Alliance Altyn LLC, Bishkek, Kirgizia,
² NUST MISIS, Research Center for Applied Geomechanics and Convergent Technologies in Mining, 119049, Moscow, Russia.

V.A. Eremenko, e-mail: prof.eremenko@gmail.com.

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