Exploration Methods: Electromagnetic
A prospective technique which involves applying a varying current to induce an electromagnetic field to the subsurface. It is one of the most commonly used survey techniques in mining or reconnaissance surveys and involves a high complexity in the management of the induced electromagnetic field. Its data acquisition may be on land and airborne, and are widely used in mining studies.
The interaction of the electromagnetic field and the subsurface generates set of measurements, vector modules and angles associated with spatial decomposition of the field, this led in the twentieth century to a diverse family of application modes of the method. Currently its implementation is grouped according to the type of measures to control the induced and observed field, the time domain and the frequency domain electromagnetic method.