Aerial low-Frequency Complex

System features

The basis of the complex is the EM-4H multi-frequency aeroelectro-prospecting system, which implements a modification of the inductive dipole profiling method. The transmitter loop is mounted on an aircraft (airplane or helicopter), or towed behind it (helicopter) together with the receiver in a gondola.

Processing of the obtained data includes the conversion of the output parameters of the system into effective resistance (conductivity) taking into account changes in flight altitude and the offset of the receiver relative to the transmitter.

A mandatory element of this complex is a high-precision aeromagnetometer, the sensor of which is located in the same exhaust nacelle as the induction sensor.

As a navigation system, the combined GPS-GLONASS system is used.

Depending on the tasks to be solved and the specific geological and geophysical situation, a gamma-ray spectrometer may be included in the complex.

Geological problems solved by the EM-4H system:

1. Isolation and mapping of different-rank zones of discontinuous faults, permeable zones of fracture and crushing, expressed by linear conduction zones.
2. The study of the internal structure of areal destructive zones.
3. Tracking ore-controlling and ore-locating tectonic zones within known ore fields.
4. Isolation of local conductivity anomalies, promising for the detection of ore deposits.
5. Isolation and mapping of buried paleodolines in order to predict placer deposits.
6. Identification of coal seams.
7. Identification of buried weathering crusts and associated mineral deposits.
8. Mapping of geological bodies with contrasting electrical properties.
9. Mapping the boundaries of permafrost.