Abstract
The Transient Electromagnetic (TEM) method is being increasingly used for the detection of metalliferous orebodies, but there are relatively few aids available to assist the design and interpretation of TEM surveys. A first order numerical approximation has been used to investigate the late-time geometric response characteristics of the inline and broadside prospecting techniques, when profiling over a thin finite conductor embedded in a resistive host rock. The study compares the interpretational and operational attributes of the two configurations for differing target-loop geometries, including changes in conductor dip, strike, depth, traverse off-set and loop separation. It is shown that the little-used broadside geometry offers some interpretational advantages, but the inline configuration has a greater depth of investigation, and is more suited to routine applications.
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