Localised Indicator Kriging

摘要

Localised indicator kriging was developed following a similar approach used by Marat Abzalov (2006)rnin his paper titled ‘Localised uniform conditioning (LUC): A new approach for direct modelling ofrnsmall blocks’. Abzalov introduced the idea of mapping panel distributions from uniform conditioningrnonto selective mining unit-sized blocks that were created using ordinary kriging. This concept ofrnremapping panel distributions was applied to multiple indicator kriging histograms.rnAt Newmont a program was developed that made the remapping of MIK histograms to SMU sizedrnblocks extremely effi cient and was subsequently tested on several gold deposits. The results havernbeen encouraging as the localised indicator kriging (LIK) method has eliminated many issues thatrnhave plagued both ordinary kriging and multiple indicator kriging. Use of localised indicator krigingrnmethodology limits the smearing of high-grade and the over-smoothing of grade that is common andrndiffi cult to control in OK but retains the ability for localising grades. LIK also simplifi es change-ofsupportrncorrections, eliminates un-mineable slivers of low or high-grade when dealing with smallrntonnages, and allows for the mapping of linear and non-linear estimates into the same block.