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Teck has 13 mines in Canada, the US, Chile and Peru, and actively explores for copper, zinc and gold across the globe. The data to model included bench maps, blastholes, reverse circulation (RC) and diamond drillholes (DDH). Quebrada Blanca had a conceptual model of the hypogene area of the deposit, which differed in some respects from the supergene zone. The aim was to test the new implicit modelling tools in Vulcan 10 to automatically produce solid models directly from the database. The user-defined variables were lithology, alteration and mineralised zones. Not all holes were fully mapped so DDH and RC drilling data was included, along with the blastholes and structural information. Blastholes and drillholes were displayed differently to weight data for ranking the interpretation. Continuity of the interpreted bodies could be reviewed before a final comparison and validation of the solids was obtained with implicit modelling. The synthetic database inherits the smoothness of the contacts between the interpreted polygons, and a low smoothing level was chosen to accurately represent the data. Between 4 and 16 samples were used to provide a more reliable estimate within the mesh composites and result in smoother edged solids. The orientation of the units was already implicit in the interpretation. The horizontal search radius was set at 80m, covering the maximum distance between the composites. A vertical radius of 15m was set to coincide with the interpreted spacing of the plans. It did require a drillhole database with previously reviewed sections and compositing data, as well as the definition of preferential directions of ellipsoids for model calculation. Sections andor plans can be used in conjunction with the drilling database. The 3D solids are generated in minutes and are easy to use, auditable and reproducible. The speed leads to higher productivity, with more alternatives generated in less time. Implicit modelling incorporates geostatistical tools, including ordinary kriging and locally varying anisotropy to accurately account for trends. Teck Chile - Fernando Aguirre, Resources and Reserves Manager and Javier Miranda, Senior Resource Geologist. Users can combine various methods in a hybrid approach which best suits their deposit and achieves desired planning outcomes, commented General Manager Maptek South America Marcelo Arancibia. Uncertainty modelling allows multiple models of an orebody to be automatically generated from the same drillhole data.
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