The resistivity method is useful for the investigation of horizontal and vertical variations in the electrical properties of the subsurface. This method does utilise either the take in hand current or a low frequency alternate current. This method is creature primarily utilised in arena water exploration, mineral exploration, oil exploration, and waste site exploration.
In the resistivity method, current is driven through a pair of electrodes and the potential customary in the subsurface by this current can be measured by the second pair of electrodes similar to a voltmeter. Based as regards the responses, enliven or apparent resistivity of can be evaluated. In-homogenous layers within the subsurface can be interpreted by the fact that they deflect the current and distort the in the works to times-fortunate values of potentials. The electrical potentials can in addition to be developed within the subsurface by electrochemical reactions, from any outdoor source, telluric currents, etc. The resistivity methods can be useful to believe to be the intensity as without mystery as the touch of several types of ore bodies.
The resistance offered by any try to the current flow can be expressed in terms of resistivity. The electrode configurations can be of several types such as Wenner’s, Schlumberger’s, dipole-dipole, etc.
The igneous rocks are the most resistant. The sedimentary rocks are the most conductive. The teenage volcanic rocks lead possess lesser resistivity taking into account compared to the primordial volcanic rocks. The resistivity of the rocks depends upon several factors such as porosity, saturation, content of clay, etc.
The metallic sulfide deposits are often be termed as the zones of anomalously low resistance.
Potentials, currents, and electromagnetic fields can be measured by using several electrical methods of geophysical prospecting. These methods reach flexibility the best results in the upper few hundred meters of the surface and in the zones containing flourishing un-weathered stone bodies.
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The induced polarisation method is the and no-one else geophysical method which is gifted of detecting concealed and disseminated sulphide deposits. This method is based upon the fact that the earth materials release after the applied current is switched off. When the applied primary current is switched off, the decay of the additional voltage can be detected and thus provides the measurement of the size and the incline of the chargeable stone body. This method does utilise the electrochemical effects produced by currents, which adding through the disseminated sulphide metal deposits. The flow of electric current in any stone body may make parts of it to be electrically polarised. This effect is mostly seen in metallic sulphides and graphite deposits.