Abstract
An airborne electromagnetic device, designed to measure electromagnetic anomalies in a manner that readily lends itself to the interpretation of conductivity and type‐body, led to the Aero‐Newmont vertical coaxial coil EM system. This mining prospecting device, applicable chiefly in Canadian‐type mineral environment, is rigidly mounted on an S-55 helicopter. Continued studies in the theory of interpretation for such a device, plus an accumulation of over five years of field experience, have provided a knowledge of the limitations which compliment the interpretation procedure to produce a surprisingly accurate and useful exploration tool.

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