Estimation of Iron Ore Resources Integrating Diamond and Percussion Drillholes

APCOM 2009
Marius Strydom,
Abstract The technology of percussion drilling is well mastered, even if significant differences in assays analyses are observed in comparison to diamond drilling. Statistical studies on twin drillholes show that diamond and percussion assays cannot be put together in a traditional kriging approach. Then the question arises on the possibility to use both type of data to get a reliable estimate of resources. For the same budget more drillholes can then be drilled with cheaper percussion technology still improving the estimation quality.To take into account the lesser reliability of the percussion assays, a noise characterized by a variance is added to these data. The methodology consists in two steps: 1. Cokriging at the percussion assays locations of the equivalent diamond value. 2. Block kriging using diamond assays and equivalent diamond values calculated previously adding to these data a noise whose variance is the cokriging variance of step 1. This particular way of achieving kriging is called kriging with variance of measurement error. The paper illustrates this innovative methodology with an application on an iron deposit. The results of that method are compared to block kriging using only diamond assays and the gain in precision is quantified. An extension of that approach to multi-element cokriging is also presented.
Keywords: Resource estimation, Integrating drillholes types, (Co)Kriging with variance of measurement error, Optimization of drilling budget, Integrating drillholes types, Optimization of drilling budget, Integrating drillholes types, Resource estimation, Optimization of drilling budget, Integrating drillholes types, Resource estimation, (Co)Kriging with variance of measurement error, Resource estimation, (Co)Kriging with variance of measurement error, (Co)Kriging with variance of measurement error, Resource estimation, Optimization of drilling budget, Integrating drillholes types, Optimization of drilling budget, Integrating drillholes types, Optimization of drilling budget, Resource estimation, (Co)Kriging with variance of measurement error, Integrating drillholes types, Optimization of drilling budget, (Co)Kriging with variance of measurement error, (Co)Kriging with variance of measurement error, (Co)Kriging with variance of measurement error, Integrating drillholes types, Integrating drillholes types, Resource estimation, Resource estimation, Optimization of drilling budget, Optimization of drilling budget, Resource estimation, (Co)Kriging with variance of measurement error
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