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Several borehole geophysical techniques have been developed in recent years. Assaying technique development has been concentrated on nuclear methods, with some progress being made on using electrical and magnetic properties for mineral identification. Adaptation of conventional surface geophysical techniques to the borehole for locating near-misses of mineralized zones has led to the development of borehole resistivity, electromagnetic (EM), gravity and magnetic methods to the borehole environment. This paper discusses some of the applications and pitfalls of these new techniques.
Additional Publication Details
TRENDS IN BOREHOLE GEOPHYSICS FOR MINERAL EXPLORATION: ASSAYING AND REMOTE DETECTION.