Porwal, Alok 
  
5 SUMMARY AND CONCLUSIONS 
A GIS-based fuzzy model was developed and tested for predictive mapping of basemetal deposits in the Aravalli 
province. The membership values for the input evidential maps were derived using subjectively assigned weights and 
were combined using a fuzzy gamma operator with different values of y. The resulting favourability maps predicted 
most of the known basemetal occurrences in the study area. However, very low and very high values of y yield 
unrealistic favourability maps. Moderate values of (about 0.5) are most suitable for combining maps using fuzzy 
gamma operator. The model also predicted new areas that can be possible targets for further exploration in the area. 
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1184 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000.