Institute of Mining, Far East Branch, Russian Academy of Sciences, Khabarovsk, Russia:

Rasskazov I. Yu., Director, Doctor of Engineering Sciences, rasskazov@igd.khv.ru
Shkabarnya N. G., Head of Laboratory, Doctor of Engineering Sciences
Litvintsev V. S., Chief Researcher, Doctor of Engineering Sciences

Far Eastern Federal University, Vladivostok, Russia:
Shkabarnya G. N., Senior Researcher, Candidate of Engineering Sciences

In spotlight of the discussion are the geological structure details of the Bolotisty Stream placer field located in the south-east of the Khabarovsk Territory, within the Sooli-Tormasin ore zone. The Lower Bolotisty block of the deposit is studied using the electrical tomography method. The section of the studied block is composed of the bottom tuffogenous silty sandstone with rock fragments surrounding a bowl overlaid by the Cenozoic clays and tuffogenous conglomerate and topped by the Quaternary alluvium. After the interpretation of the electrical tomography data from 6 survey profiles, the geoelectric and geological sections show a structure composed of four–five layers. The principal finding is the layer represented by low-Ohm clays and clay-cemented rock fragments surrounding the Cenozoic erosion tectonic bowl and underlaid by tuffogenous agglomerated breccias underlayer. The thickness of the clay and tuffogenous breccias layers reaches 30 m. Judged by the low electrical resistivity as per the electrical tomography survey data, the clay layer may contain sulfide minerals, which makes it interesting from the viewpoint of alluvial gold occurrence at the depth down to 50 m.

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