Geomechanical assessment of safe technologies for underground mining beneath open pit mines

In many mineral mining regions, against the background of persistently elevating labor and money input, there is a trend of complication of mining conditions and depletion of ore reserves at shallow depths and in unfavorable geological conditions. Specific emphasis is laid on the geomechanics and geodynamics in the earth crust areas susceptible to dynamic events induced by confining pressure, which greatly affect mining safety and economic performance. The cost reduction and productivity boosting in ore mining requires adjustment of accessing and extraction flow charts. In this regard, at gold-bearing deposits Pioner and Malomyr which are intended for further operation with transition to underground mining using various roomand-pillar systems proposed, the integrated stress–strain behavior assessment was implemented in the mine and adjacent rock mass with identification of increased stress concentrations zones toward improved geodynamic safety of mining. The studies show that at the great depth of Quartzite Site, given the ore body thickness up to 4.5 m, the use of the room-and-pillar mining system can result in failure of the edge area of rock mass after extraction of 50% of ore reserves from a sublevel stoping block, while in Andreevskaya and SV-Bakhmut Sites at a shallower depth, all mine structures preserve stability at all stages of mining.

Potapchuk M. I., Rasskazov I. Yu., Sidlyar A. V., Lomov M. A., Rasskazov M. I. Geomechanical assessment of safe technologies for underground mining beneath open pit mines. MIAB. Mining Inf. Anal. Bull. 2022;(1):84-96. [In Russ]. DOI: 10.25018/0236_1493_ 2022_1_0_84.

The study was assisted by the Shared-Use Center for Scientific Data Processing and Storage, Far East Branch, Russian Academy of Sciences, and supported by the Ministry of Science and Education of Russia, Agreement No. 075-15-2021-663.

M.I. Potapchuk¹, Cand. Sci. (Eng.), Leading Researcher, e-mail: potapchuk-igd@mail.ru,
I.Yu. Rasskazov, Dr. Sci. (Eng.), Corresponding Member of Russian Academy of Sciences, Acting Director, Khabarovsk Federal Research Center of Far Eastern branch of Russian Academy of Sciences, 680000, Khabarovsk, Russia, e-mail: adm@igd.khv.ru,
A.V. Sidlyar¹, Researcher, e-mail: sidlyar.alex@gmail.com,
M.A. Lomov¹, Junior Researcher, e-mail: 9241515400@mail.ru,
M.I. Rasskazov¹, Researcher, e-mail: rasm.max@mail.ru,
¹ Mining Institute, Far Eastern Branch of Russian Academy of Sciences, 680000, Khabarovsk, Russia.

M.I. Potapchuk, e-mail: potapchuk-igd@mail.ru.

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