Electromagnetic Geophysics: Electromagnetic Surveys are Cost-Effective Surveys in Geophysical Exploration and Aid in Mineral Prospecting

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Electromagnetic GeophysicsElectromagnetic geophysical surveys are conducted both from the air and on ground. These surveys are used to search for metallic conductors and to provide a comprehensive assessment of the environment in which we live.
 
It has been proven, that our physical environments can pose dangers to the safety of their populations, completely unbeknownst. As such, electromagnetic surveys are used as a means of testing the electromagnetic fields of the places the population conducts their lives.
 
Electromagnetic surveys also aid in prospecting regions for minable commodities that may be present under significant bedrock formations.
 
As the level of electromagnetic fields in a particular spot have a direct effect on the health of those occupying these spaces, it is of crucial importance that electromagnetic surveys are conducted with the highest level of accuracy and precision possible. In addition, the uncovering of valuable minerals is also of pressing matter.
 
Airborne electromagnetic surveys (AEM) enable a quick assessment of the electromagnetic fields present in one particular area. While airborne electromagnetic surveys can be applied to most regions, data is difficult to acquire in spots that have high levels of country rock that are particularly conductive.
 
There are seven orders of magnitude in the conductivities of geological materials. Electromagnetic surveys receive the most intense responses from massive sulphides.
 
The main principles of conducting an electromagnetic geophysical survey are that an alternating electric current (frequency and magnitude are noted) will traverse through a sending coil. This will create a magnetic field that will surround the coil above and underground.
 
Underground, an eddy current is generated and will instigate a secondary current. There is a phase lag that enables survey takers to distinguish between the primary and secondary currents. Eddy currents will be stronger if the source and receiver are close to a zone that is conductive.
 
Airborne magnetic surveys are commonly employed by companies in the geophysical industry and are used to collect both data regarding electromagnetic currents and to develop maps.
 
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