Page 266 - Geochemical Anomaly and Mineral Prospectivity Mapping in GIS

Data-Driven Modeling of Mineral Prospectivity 269

Fig. 8-8. Coherent and non-coherent locations of epithermal Au deposits and their immediate
surroundings (proxy deposit-type locations), Aroroy district (Philippines) per analysis using set 1
of randomly-selected non-deposit locations (Figs. 8-4 and 8-7A). Polygon outlined in grey is area
of stream sample catchment basins (see Fig. 4-11). See text for further explanation.

to result in predictor maps with weaker predictive strengths than using only coherent
deposit-type locations.
The usefulness of coherent deposit-type locations (Carranza et al., 2008b) and the
advantage of coherent proxy deposit-type locations over all proxy deposit-type locations
(Stensgaard et al., 2006) in GIS-based data-driven modeling of mineral prospectivity are
further demonstrated in this volume (see below). We now turn to discuss strategies for
the cross-validation of data-driven models of mineral prospectivity.