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Evaluation of stability of slopes is an important part of open pit mines planning and design due to economic and safety considerations. Slope failure can cause disruption to mine operations, loss of lives and damage to equipments. The different kinds and origins of discontinuities play a dominant role in the failure of rocks and hence in mine slopes stabilities. In this paper, the effect of mechanical properties of discontinuities on these phenomena is investigated. Angouran lead-zinc open pit mine is situated app...