Fig.1. Distributions of geophysical data in relation to the ore field and sites of ore occurencesComplex airborne survey (aero-TEM, airborne gamma-ray spectrometry, airborne magnetic survey) has been conducted in August-September, 2008 with use of the MI-8MTV helicopter. The total area of the survey – 500 sq.km. Scale of the survey – 1:10 000.
The Dukat gold-silver field in the Magadan region is localized in intrusive dome uplift of about 35 sq.km area, limited around by disjunctive dislocations.
On U - K correlation distribution near the Dukat ore field the compact abnormal halo is distinctly occured (Fig.1) which can be identified as paleo-volcanic structure (VTS) that doesn't contradict geological and petrographic and structural data.
In the central part of the structure an abnormal Th – K halo is located, directly to which, to its near-contact zone, the ore field is linked. On the internal perimeter of VTS, mainly in a northeast half, intensive halos of abnormally high conductivity in relation to which the ore field is localized in exocontact zone are occured. The ore nature of VTS is confirmed by the numerous gold-silver occurences and occurences of tin which are spread within all the structure, but obviously tending to its border.
The results of complex airborne geophysical survey, meaning airborne TEM and gamma-ray in this case, show, on the example of the Dukat ore field, highly reliable search criteria of localization of the large-scale gold-silver occurence to the border areas of abnormal halos of elements correlations