Looking at the Facts About Electromagnetic Surveys

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An electromagnetic survey is a specific type of geological survey that is used in geophysical exploration. Mining and mineral exploration companies use electromagnetic surveys to prospect for concentrations of different types of base metal sulphides and water underneath bedrock. Governments and other environmental safety organizations use electromagnetic surveys to determine the overall safety of populated areas which may have unsafe electromagnetic or radioactive fields.

Electromagnetic surveys use very low frequency currents which are introduced into the ground. This creates a secondary current underground which can be measured. The resultant measurements of that secondary current are very important to determine what types of conductive materials are present in the area.

Airborne electromagnetic surveys are effective ways to map larger areas of interest using less time and minimal manpower. They are a cost-effective method of geological mapping which offers rapid data acquisition and the ability to analyze remote and difficult areas to map.
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Facts About Electromagnetic Surveys

Electromagnetic surveys are a common type of geophysical survey to detect geophysical anomalies, which is an area where the earth has unique geophysical properties. The data acquired by an airborne electromagnetic survey is key to identifying the presence of conductive bodies. These surveys are most often used to identify large concentrations of base metal sulphides beneath bedrock without physically drilling into the ground.

How Is an Electromagnetic Survey Executed?

The basis of an electromagnetic survey involves introducing an alternating current (usually a very low frequency or VLF) into the ground. Airborne electromagnetic surveys are executed by an aircraft that has been equipped with either a "pulseā€ technique system or a very low frequency (VLF) system which uses marine signals as a primary source tool. . Direct contact with the ground is not a requirement in order to successfully conduct an electromagnetic survey. This makes it possible for airborne surveys to be executed over larger areas and for rapid, efficient, and economical data collection.
When the current enters the ground it creates a secondary current and a resulting electromagnetic field. The existence of conductive materials in this electromagnetic field will cause the current to intensify.  Electromagnetic surveys involve collecting data from these fields and using that data to determine the concentrations of specific elements or water in particular survey areas.  

Applications for Electromagnetic Surveys

The obvious applications of electromagnetic surveys are for prospecting activities in the mining and mineral exploration fields. Geologists and mineralogists use electromagnetic surveys for geophysical mappings of targeted areas. Governments and environmental agencies use electromagnetic surveys to acquire valuable data about potential safety concerns; surveys can be used to detect intense electromagnetic or radioactive fields which may be present in heavily-populated areas. 
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