Abstract
On the basis of detailed fieldwork and analytical procedures (microprobe, X-ray diffraction, chemical analysis, etc.), ores and altered wall-rock rocks of the Khadatkanda and Etyrko deposits in the Kodar-Udokan mineragenic zone were studied. Economic concentrations of gold and some other accompanying metals have been established in ore of the Khadatkanda uranium deposit in the Syul’ban uranium district. REE-U lodes with brannerite-uraninite have been found at the Etyrko Fe-Ti-V deposit related to the Chinei layered pluton in the Udokan mining district. The outlook for the discovery of new types of economic uranium deposits is substantiated with respect to the known hydrothermal uranium ore objects and nontraditional setting related to the layered mafic-ultramafic intrusions.
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