Geologically Constrained Fuzzy Mapping of Gold Mineralization Potential,Baguio District,Philippines |
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| Authors: | Carranza Emmanuel John M Hale Martin |
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| Institution: | (1) Regional Office No. 5, Mines and Geosciences Bureau (MGB), Philippines;(2) International Institute for Aerospace Surveys and Earth Sciences (ITC), Hengelostraat 99, P.O. Box 6, 7500 AA Enschede, The Netherlands |
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| Abstract: | An application of the theory of fuzzy sets to the mapping of gold mineralization potential in the Baguio gold mining district of the Philippines is described. Proximity to geological features is translated into fuzzy membership functions based upon qualitative and quantitative knowledge of spatial associations between known gold occurrences and geological features in the area. Fuzzy sets of favorable distances to geological features and favorable lithologic formations are combined using fuzzy logic as the inference engine. The data capture, map operations, and spatial data analyses are carried out using a geographic information system. The fuzzy predictive maps delineate at least 68% of the known gold occurrences that are used to generate the model. The fuzzy predictive maps delineate at least 76% of the  unknown gold occurrences that are not used to generate the model. The results are highly comparable with the results of previous stream-sediment geochemical survey in the area. The results demonstrate the usefulness of a geologically constrained fuzzy set approach to map mineral potential and to redirect surficial exploration work in the search for yet undiscovered gold mineralization in the mining district. The method described is applicable to other mining districts elsewhere. |
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| Keywords: | Mineral potential mapping fuzzy sets fuzzy logic model validation spatial association Baguio gold district (Philippines) |
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