Parameters of blast throw of rocks to mined-out void of open pit

The article reports the studies on the parameters of blast throw of rocks to the minedout void of an open pit during large-scale blasting. The instrumental monitoring of the blast throw volume is low-effective (almost impossible) on blocks located near the mined-out void because of the long drop and, consequently, the large area of dispersion of blasted rocks. The indirect methods find out that a substantial influence is exerted on the blast throw volume by the value of the slope angle. For instance, for a 15 m-high slope with the slope angle greater than 60 deg, the blast throw volume grows and reaches 90–130 m3/m. The highest blast throw volume for the test open pit should be assumed as 180 m3/m (given that the following conditions are fulfilled: the slope angle is greater than 80 deg; no additional delay in the first blast holes in a row along the slope edge). A blast throw is mostly formed by the blast holes in the 1st and 2nd rows at the slope edge. The studies show that in case of the longer delays in these rows, with the blast action directed off the mined-out void, the blast throw volume drops to 50–90 m3/m.

Marinin M. A., Ilyukhin D. A., Rakhmanov R. A., Alenichev I. A. Parameters of blast throw of rocks to mined-out void of open pit. MIAB. Mining Inf. Anal. Bull. 2025;(1):66-79. [In Russ]. DOI: 10.25018/0236_1493_2025_1_0_66.

M.A. Marinin¹, Cand. Sci. (Eng.), Head of Chair, e-mail: Marinin_MA@pers.spmi.ru, ORCID ID: 0000-0002-5575-9343,
D.A. Ilyukhin¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: Ilyukhin_DA@pers.spmi.ru, ORCID ID: 0000-0001-8469-334X,
R.A. Rakhmanov, Cand. Sci. (Eng.), Researcher, Institute of Comprehensive Exploitation of Mineral Resources Russian Academy of Sciences, 111020, Moscow, Russia, e-mail: ipkon-dir@ipkonran.ru, ORCID ID: 0000-0002-5341-2274,
I.A. Alenichev, Cand. Sci. (Eng.), UK Polyus, 123056, Moscow, Russia, e-mail: info@polyus.com, ORCID ID: 0000-0003-3359-4450,
¹ Empress Catherine II Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

D.A. Ilyukhin, e-mail: Ilyukhin_DA@pers.spmi.ru.

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