Ground magnetic survey
Ground magnetic survey is one of the most productive methods of ground geophysics. The method is based on the study of the Earth's magnetic field and the distribution of rocks with different magnetic susceptibility. The accuracy of modern proton magnetometers and magnetometers on the Overhauser effect allows to conduct a survey with an error much less than 0.5 nT, which makes it possible to apply magneto-prospecting for a wide range of tasks. The accuracy of potassium and quantum magnetometers is orders of magnitude higher. At least two devices are required when conducting a survey. One magnetometer (magnetovariation station) is constantly in one place, the others perform measurements on ordinary pickets. At the beginning of the working day and at the end, it is necessary to carry out measurements at reference points.
Magnet prospecting is used in regional studies, solves a wide range of prospecting and exploration tasks, is used for archaeological and engineering research, etc.