THE MAGNETIC INDUCED POLARIZATION (MIP) METHOD

The magnetic induced polarization (MIP) method derives information relating to the induced polarization characteristics of the earth through measurements of the magnetic fields associated with galvanic current flow. In the time domain, transient magnetic fields due to polarization current flow are measured. In the frequency domain, either the change in magnetic field with frequency or the phase shift of the magnetic field at a single frequency may be measured. The MIP method responds to regions of anomalous polarization, rather than providing physical property information. It tends to emphasize induced polarization effects in highly conducting bodies. It has special merit in certain problem areas, for example, where highly conducting overburden exists, or where the surface conditions render ground contact difficult. The results of field tests are presented where surveys using the MIP method have been carried out over “massive” and disseminated types of sulfide bodies or graphitic zones.