Aeromagnetic Surveys Reveal Magnetic Field Data and Are Used to Create Maps and Mining Information

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Aeromagnetic Surveys Reveal Magnetic Field DataThe acquisition of Airborne magnetic data is the first step in the exploration process, providing geologists with detailed mapping of magnetic field and anomalies. The magnetic data is then interpreted by Geophysical consultants to further pinpoint areas of interest to continue the exploration process.
Aeromagnetic surveys acquire the data necessary to create geophysical maps, and are the preliminary research phase of mineral exploration. Just as a standard magnetic survey demonstrates how abundant magnetic minerals are spaced over a specific geographical area, an aeromagnetic survey enables wider geographical spaces to be surveyed in order to create accurate geological maps, as well as to determine economical and profitable locations to commence exploration in the mining industry.
Aeromagnetic surveys utilize specially modified aircraft in order to gain an extended overview of the land. Magnetometers are typically housed in "pods” on each wingtip of the aircraft and at the tip of a "Stinger” behind the aircraft.
How Do Aeromagnetic Surveys Work?
The aircraft strategically flies grid patterns at precise intervals using GPS technology over a predetermined survey area. The magnetometers measure the slight variations existent in the environment's magnetic field.
The variations of the Earth's magnetic field are a result of the level of concentration of magnetic minerals in different areas of the Earth's crust, but are also affected by the varying effects of solar wind and diurnal variations. On account of this, ambient magnetic fields are in constant flux, outlining the necessity for base station monitoring to avoid flying in periods of high diurnal activity, and to correct for  these effects.
While aeromagnetic surveys are extremely helpful for mining companies as a means of pinpointing highly concentrated deposits of magnetic minerals such as iron ore, they are most commonly employed as a means of creating detailed topographical maps employed by a wide range of industries.
Companies specializing in aeromagnetic surveys are capable of acquiring important geoscientific and geographical data using a range of advanced technological devices. Aeromagnetic surveying will be completed most precisely when it is done with the developed application of airborne magnetic data acquisition equipment and an experienced crew.
As accuracy is of upmost importance when acquiring the data, there are certain features that data acquisition systems should have. The following are some characteristics that should be present in an optimal data acquisition system:
  • Real time graphical display and flight path following
  • Numerous differential analog inputs
  • Adaptive signal processing techniques, simplified calibration features
  • Immediate quality control
  • Adjustable vertical and horizontal view scales
  • Data is recorded exactly as acquired
The above are just a few of the characteristics that should be looked for when selecting a data acquisition system prior to any aeromagnetic survey. Radiometric systems should also be given proper consideration as they offer important data in an airborne survey.
In short, many industries rely on aeromagnetic surveys. The quality of operation and equipment used is of upmost importance in order to secure optimal and precise data.
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