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 The magnetic survey technique is based on mapping localised variations in the Earth’s magnetic field caused sub-surface magnetic materials, which range from naturally occurring magnetic minerals to man-made ferrous objects.
From where a wide range of missions:

Archaeological research
Mine-clearing<Click here  
Or study regional geological trends or mineralization.

Magnetic surveys are carried out using a man-portable instrument with readings taken on a regular grid or along selected traverse lines.

GEMSOL UK Ltd is an expert in Magnetics method deployment and Magnetics Survey

GEMSOL UK Ltd IS able to assist you in your project of: Archaeological research, engineering Mine clearing, Study regional geological trends or mineralization  

How does it work
The equipment functions by measuring the Earth’s magnetic field to a very high precision at each survey station. Ferrous materials in the subsurface have an induced magnetic field that is superimposed on the Earth’s field at that location creating a magnetic anomaly. The spacing of survey stations depends on the width of the expected anomaly, which broadens with the size, and depth of burial of the targeted feature. Continuous profiling methods may be used for a high-resolution dataset.

Treatment and results
The results of the magnetic survey are usually presented as total field and analytical signal plots . The total field data may be used to observe the general character of the magnetic field across the survey area while the peak values  displayed on the analytical signal plot indicate the source positions for dipole type magnetic anomalies.
In general terms, the interpretation of a magnetic anomaly is based on observing the type (pole/dipole), amplitude and wavelength of the anomalous features.