Abstract

BAKHTAVAR, E.; ABDOLLAHISHARIF, J.  and  AMINZADEH, A.. A stochastic mathematical model for determination of transition time in the non-simultaneous case of surface and underground mining. J. S. Afr. Inst. Min. Metall. [online]. 2017, vol.117, n.12, pp.1145-1153. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2017/v117n12a9.

This research introduces a stochastic mathematical model that uses open pit long-term production planning on an integrated open pit and underground block model to determine the optimal time for transition from open pit to underground mining. In the model, ore grade is considered a random parameter in objective function and ore grade blending constraints. The objective function is modelled as the maximization of net present value in the mode of non-simultaneous combined open pit and underground mining. Moreover, the most important and conventional constraints in open pit long-term production planning are developed for non-simultaneous combined mining. Finally, information on an iron ore deposit is used to evaluate the results of the model.

Keywords : stochastic programming; transition time; non-simultaneous; combined mining.

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