Abstract
Telluric and magnetotelluric surveys utilizing natural 8‐hz electromagnetic fields have detected resistivity variations associated with some proven sulfide deposits. From an operational point of view the telluric method is preferred to magnetotellurics. Either method, however, can detect a conducting dike, providing that its width is greater than its depth of burial. For surveys where the telluric field is measured in a direction perpendicular to the strike of the conductor, theoretical profiles derived from two‐dimensional conductivity structures agree well with the field results. For this polarization, it is thus possible to use a general model as an aid to the interpretation of survey data.
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