Evaluating the Influence of Underground Mining Sequence under an Open Pit Mine
T. K. M. Dintwe, T. Sasaoka, H. Shimada, A. Hamanaka, D. Moses
Department of Earth Resources Engineering, Kyushu University, Fukuoka, 819-0395 Japan
Keywords: Underground mining sequence, open pit-underground mine interaction, slope stability, numerical modeling
Abstract
For this study, as part of the underground operations, the underground mining sequence was explored for suitability in the Zuuntsagaan mine. Two mining sequences are considered; bottom-up (B-U) and top-bottom (T-B), and the instability of stopes and open pit slopes is evaluated in response to each sequence. For the present rock mass conditions and stress state, with reference to the underground section, the results revealed that T-B sequence has lower ground movements. On the open pit section, the effect of the two sequences is relatively the same while the difference is mainly observed in the underground section.
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