Magnetic survey

equipment: Magnetometers G-859AS with a proton base G-856 by Geometrics

The use of a magnetometer with optical pumping allows you to perform magnetic research in the form of measuring the total magnetic field of the Earth, as well as the vertical and horizontal gradients. The speed and accuracy of measurement with this type of magnetometer also allows to keep a very small measurement step (even a dozen centimeters), which allows detecting even slight disturbances of the magnetic field.

  1. Metallic minerals deposit prospecting

The magnetic method is one of the main geophysical methods used for the exploration of deposits of metallic minerals with good magnetic susceptibility. An increase in the accuracy of the instruments used nowadays makes it possible to search for and document deposits of useful minerals with very weak magnetic properties (siderites, bauxites). This method, thanks to the development of research equipment, gives the possibility of searching for igneous rocks, useful as aggregate for road construction (e. g. basalts), as well as identification of sedimentary rock structures occurring in anticlinal forms, within which oil or gas-bearing layers may be located.

  1. Landslide monitoring

The basis of monitoring is the temporary tracking of changes in the position of artificial magnetic sources placed in main body of a landslide. The undeniable advantage of this method is that it allows you to track the speed of landslides of different layers, as well as locate the depth of its surface of rupture. This is possible due to that magnetic sources can be placed at various depths.

  1. UXO detection

The more spectacular applications of the magnetic method can include the opportunities it offers in the search for and localization of unexploded ordnance in areas already no longer used militarily, and managed for non-military purposes. High accuracy of modern magnetometers allows locating smaller and smaller objects, thus increasing people’s safety.

  1. Archaeological prospection

The magnetic method works very well in search, with high resolution, for archaeological sources and recognition of archaeological sites. This allows to narrow down the area of archaeological works, thanks to which these works can be carried out in accordance with archaeological art, which in the case of rescue research significantly reduces the need to choose: precisely or quickly.

  1. Location of underground facilities (pipes, reservoirs, old water and sewage infrastructure)

In order to develop local development plans correctly, it is necessary to know the old infrastructure: water and sewage, construction infrastructure (e. g. underground reservoirs, old buildings), or underground energy infrastructure. The use of high accuracy magnetometers allows to locate such objects.

  1. Location of fissures and cracks in solid substrate for the design of retention reservoirs

Seemingly solid ground in the area of the designed retention reservoir may have fissures and cracks that are difficult to detect. Iron oxides are deposited in these cracks as a result of water activity. Thanks to their strong magnetic properties, magnetic gradient measurements, carried out with a suitably small step, allow for the detection of fractures.

  1. Detection of covered rubbish dumps

The magnetic method is effective in searching for rubbish dumps invisible on the surface. Based on the size of the observed magnetic anomalies and their distribution, the type of stored waste can be determined. Analysis of the magnetic field distribution allows to determine whether the landfill contains only municipal waste or whether there are also industrial waste. They can be used to locate landfills for tanks with hazardous and poisonous waste, as they were usually placed in steel tanks and barrels.