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Book Chapter

Well Logging and Borehole Geophysics in Mineral Exploration

By
William E. Glenn
William E. Glenn
Chevron Exploration Corporation, P. O. Box W2107, Perth, Western Australia 6001, Australia
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Gerald W. Hohmann
Gerald W. Hohmann
Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112
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Published:
January 01, 1981

Abstract

Both well logging and borehole geophysics are assuming greater importance in mineral exploration and development as targets become deeper, as drilling costs increase, and as solution mining becomes necessary. Resistivity and induced polarization are the most important logs in base metal applications because they can be used to estimate sulfide content and to aid interpretation of surface surveys. Natural gamma-ray logs are used extensively to estimate uranium content; a recently developed cryogenic logging tool measures an early daughter product of uranium in order to avoid disequilibrium problems. Other logging tools, usually used in combination, provide information on physical properties such as fracturing, density, and porosity, which are important for solution mining, and on potassium, magnetite, sulfide, and chemically bound water content. Borehole assaying with neutron activation is a promising area of current research. Borehole geophysical techniques such as mise a la masse, induced polarization, resistivity, and electromagnetics greatly increase, at little additional cost, the amount of information derived from a drill hole.

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Contents

Economic Geology Publishing Company

Seventy-Fifth Anniversary Volume

Brian J. Skinner
Brian J. Skinner
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Society of Economic Geologists
ISBN electronic:
9781934969533
Publication date:
January 01, 1981

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