Stream sediment geochemical analyses from 140 mining company exploration surveys of the Coromandel, Northwest
Nelson, Marlborough and Westland regions of New Zealand have been compiled from open file reports and entered on a
database called REGCHEM (for Regional Exploration GeoCHEMistry). REGCHEM is supported by GEOEXPL, a
custom-written computer software application which operates under the Microsoft Access relational database mangement
system on a PC-type computer. The data are plotted as maps using the Maplnfo geographic information system (GIS)
package. Thesholds separating anomolous values from background values are determined using the PROBPLOT
univariant statistical package, which enables the descrimination and modelling of several populations. Relevant
REGCHEM data are being incorporated into a GIS for the Coromandel region as part of ongoing studies to sevelop
mineral deposit and metallogenic models for the region, and to assess regional prospectivity.]