Abstract
Ore resource estimation based on radial based functions - Case study on União Luiz and Morro do Carrapato Gold Deposits (Alta Floresta Gold Province)
Highlights
Geostatistics has been accepted as a mining industry standard for mineral resource estimation, and ordinary kriging is the estimation technique used by geoestatisticians to compute mineral resources
Multiquadric equations were used as an alternative method to compute ore resources
The gold 3D model showed the vertical structure for the highest gold grades, representing the main mineralization and suggesting a structural conditioning to gold mineralization
Summary
Geostatistics has been accepted as a mining industry standard for mineral resource estimation, and ordinary kriging is the estimation technique used by geoestatisticians to compute mineral resources. This technique depends on the spatial correlation model given by the variogram. There are some cases where the variogram cannot be calculated, such as: when the direction of mineralization or spatial phenomenon is unknown, the distribution is random, or due to poor sampling. In these cases, an alternative method should be used to replace ordinary kriging. The inverse of distance has been adopted as an alternative method, but a method based on the radial based function method, a method very similar to ordinary kriging, has been suggested by Yamamoto (2002)
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