This paper proposes a methodology to determine a practical Selective Mining Unit (SMU) for resource and reserve modelling within the context of an operating mine. This practical SMU is intended to represent operational selectivity based on specific mine plans and mine equipment.The practical SMU is derived from the theoretical SMU, which is optimal in the sense that it provides the most value if the operation was entirely flexible (free selection). In the approach proposed here, this optimal SMU is modified by considering the existing operational dilution; areas where this operational dilution can be improved upon; and areas where there is unavoidable dilution or loss of selectivity. The resulting practical SMU can be represented in the resource and reserve models such that mine plans derived from them will better reflect expected grades and tonnages delivered to the plant. In this paper a case study will be used to illustrate the approach.
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