U.S. Geological Survey

Quantifying Favorableness for
Occurrence of a
Mineral Deposit Type
Using Fuzzy Logic
An Example from Arizona

By Mark E. Gettings and Mark W. Bultman

U.S. Geological Survey Open-File Report 93-0392

This publication applies the quantitative theory of possibility to
the existence of silver-lead vein-type deposits in southeastern Arizona
using fuzzy set techniques. The methods of fuzzy logic are used to produce
a map of favorableness estimation for this deposit type, which can be used
to help in mineral resource estimations.

Originally published in 1993, this report is presented here in
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For more information about this report contact William D. Heran at wheran@usgs.gov