The use of a complex of methods FS and MTS on the Left-Berelekhsky prospective area, Magadan Region

In the summer of 2007, MSU-Geophysics LLC, upon request and in cooperation with specialists of Magadangeologiya OJSC, carried out research using electromagnetic methods within the Berelekhsky ore cluster.

The work was carried out to study the structure of Levo Berelehsky prospective area of the ore cluster and to determine the nature of the magnetic anomalies.

To solve the problems, a complex of methods FS, MTS was performed. Field work using magnetotellurics was performed using Phoenix equipment (PhoenixGeophysics, Ltd., Canada). The field work using the frequency sounding method was performed using the equipment of CHEMZ (OOO MSU-Geophysics, Russia).

The most striking feature of the results of electromagnetic soundings is the selection in the section of the study area of the sub-vertical zone of increased electrical conductivity. It is characteristic that, at depths of up to 1 km, the separation of the selected vertical zone into a system of smaller vertical conduction zones is noted. The exits to the surface of anomalous objects, characterized by high electrical conductivity, spatially coincide with local positive magnetic anomalies and are accompanied by secondary halos of gold scattering.

The nature of these zones of increased conductivity may be related to the area of distribution of bands of weakened, fractured and mineralized rocks that form into a single branched hydrothermal system of the site.

Fragments of the sub-vertical zone of increased electrical conductivity, at depths of 1-2 to 15-20 km, may be associated with discontinuous structures of the Chay-Yurya deep-seated fault, which may have served as a channel for the transit of potentially ore-bearing fluids.