Purpose. The assessment of options for opening and mining the upper tier of Oleniy Ruchey apatite nepheline deposits and technological solutions development taking into account geomechanical calculations of open pit slopes and benches stability, both on the marginal contour and when changing the design values of the slope parameters, open pit benches and the stability safety factor to establish the marginal maximum accepted under the condition of the values stability.
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Nemova et al. (2020) studied this question.
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