The composition of inclusions in osmium minerals as an indicator of the formation conditions of the Gule ultrabasic massif

The geological survey (scale 1:20000), prospectingand thematic works carried out in 1985–1995 allowed us to obtain new original data on the geology, mineralogy, and geochemistry of the ultra mafics of the world’s largest clinopyroxenite–dunite massif and related PGMplacers [1, 2, etc.]. Analysis of the obtained data allowsus to re-estimate the metal logenic potential of the Mai-mecha–Kotui province [3] located at the northern Siberian Platform. Osmium is a major PGM-forming element in the placers of the Ingarinda, Gule, and Sabydarivers within the Gule massif. In terms of the significant prognostic resources of a PGE (about 15 t), this massif is comparable with the unique gold and uranium placer deposits of Witwatersrand (Republic of South Africa),where, from 1921 to the present day, about 10 t Os andIr was mined.