科研之友
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摘要
In several mineral deposits, the distribution of grades in the transitions between adjacent geologic units is normally sharp or heterogeneous, creating a strong zoning effect. In these cases, the evaluation of reserves and the local estimation of grades must take into account the existence of this zoning effect. Herein is presented a methodology for the geostatistical estimation of reserves, which takes into account the spatial zoning effect of the grades, and leads to sharp transitions between distinct geologic units. Although the development of this methodology is presented for two geologic phases, the generalization for a situation of more units, simultaneously is straightforward. This methodology is illustrated in the evaluation of diamond reserves in an alluvial deposit, involving the estimation of accumulation and thickness within two distinct geologic units (diamond grades higher than zero and grades equals to zero).
- 出版日期2010-9
