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The QMAP dataset and an example of its application in modelling gold prospectivity in New Zealand

The 1:250,000 QMAP Geological Map of New Zealand is being built by GNS Science utilising an ArcInfo® geographic information system (GIS). The project has involved the staggered completion of 21 map sheets since 1994 and much of the country has now been completed. Available GIS data are already being used for a wide range of geological resource and natural hazard research. Its application to derivative research is best suited at regional scales, comparable at which the data were captured (1:50,000) and simplified for production of hard-copy maps (1:250,000). There is increasing demand to use and improve the data for site-specific hazard and resource applications. This paper introduces the QMAP dataset and presents an example of its application using weights of evidence spatial modelling to determine gold prospectivity in New Zealand. The spatial modelling showcases available geoscientific data and a method of adding value to create derivative products to market New Zealand’s mineral estate internationally. Scale, conditional dependence and continuity of datasets are key factors in the quality of the spatial modelling and the conversion of geological GIS data into client-focussed derivative information.