Audio‐frequency magnetotelluric sounding—a case history at the Cavendish geophysical test range

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Abstract
The Cavendish geophysical test site in southern Ontario, a highly conducting massive sulfide zone, has been studied using a variety of different geophysical prospecting methods. We present the results of an audio‐frequency magnetotelluric (AMT) survey which indicate adequate lateral resolution of the conductors. The two main conductive zones are most clearly detected when the electric field sensor is oriented normal to the zones, a feature that is characteristic of narrow buried bodies. When the electric field sensors were parallel to a conductor, the detection of narrow buried zones was limited. There is a clear indication of a broad low‐resistivity zone at depth between the two narrow, highly conducting zones. This interpretation is in general agreement with other survey results in this area.

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