Transient Electromagtenic (TEM)
The transient electromagnetic method (TEM) studies the response of the subsurface to the propagation of an electromagnetic field, allowing the detection of high electrical conductivity (or very low resistivity) bodies, although insulating bodies with disseminated high conductivity materials are also detectable.
The acquisition method consists in transmitting an electrical current by a square loop in the ground which will energize the conductive bodies at depth; the energized bodies will in turn emit an electromagnetic field that will be measured by a receiving instrument on the surface. The recording of different time windows of the electromagnetic response allows to obtain measurements at different depths.
Through analysis, 1D/2D modeling and interpretation, the method allows the detection of conductive bodies such as massive sulfide mineralization and the detection of contacts by resistivity contrast up to a maximum depth of 700m.