Introduction There are a lot of medium and large gold-silver epithermal deposits concentrated in the Far East of Russia. As a rule, the richest ores belong to LS-type, with dominance of quartz-vein ore [Hedenquist, J.W. Arribas, A.R. and Gonzalez-Urien E., 2000]. Separate ore veins with the thickness of several meters can have up to 1 km in length and consist of 10-15 tons of gold. If these veins are satellites of the large already workable deposits, their exploration can be economically justified even in case of their being covered by more than 100 meters of volcanic rocks. The prospecting of such objects (3 meters thickness vein on the 100 meters of depth) is a complicated geological-prospecting task and, at the first sight, none of separate geophysical method can cope with it.

The individual abstracts for this session are available to read in the PDF.

In recent years the 5-component audiomagnetotellurics method (AMT) became very popular for mining exploration and geological mapping. This method actually combines two electroprospecting methods based on the use of the Earth’s natural electromagnetic (EM) field: audiomagnetotellurics (AMT) and magnetovariational profiling (MVP). The first method is highly sensitive to the behavior of the sub-horizontal layers, and the second to subvertical boundaries or bodies. The MVP method, besides being a perfect complement to the AMT, can be used independently for mapping tectonic elements, as well as for exploration of conductive bodies with different shapes. The MVP method allows carrying out cost-effective, environmentally friendly, year-around surveys on any terrain since there is no grounding requirement, as well as the application of 3-component precision field tripods for the accurate and quick installation of induction magnetic sensors. Any 3or 5component fifth generation AMT/MT equipment be used for the application of the method in the field. However, the most cost effective would be 4 or 8 channel multifunction EM receivers Gepard with the MVP method incorporated in the design. The method of express estimation of conductive body parameters (shape, position, depth, inclination and conductivity) based on the MVP data provides unique opportunity to target drilling of the subsurface objects immediately during the MVP field survey.