Rocks of different geological age tend to have different magnetic properties.

magnet tube if they come together to form a deposit, it is bound to the vicinity of the geomagnetic field interference, so that the geomagnetic field abnormal situation. According to this, in magnetic land, sea or air Geodetic, access geomagnetic map of the geomagnetic field anomaly diagram analysis and further exploration in the area,neodymium ring magnet it can often be found in the unknown mineral or special geological structure. Rocks of different geological age tend to have different magnetic properties.