MINERALOGICAL COMPOSITION OF THE ORES OF THE UTANAKH OCCURRENCE, VERKHNE-TIMPTON GOLD ORE DISTRICT (ALDAN-STANOVOY SHIELD)

Data on the material composition of the ores of the Utanakh occurrence of the Skabeltsinsky ore field and its flanks are presented. There are four stages of mineral formation: metamorphogenic, metasomatic, hydrothermal and supergene. The metamorphogenic stage is represented by two phases: pyrrhotite-chalcopyrite-magnetite and pyrite-ilmenite-titanite; metasomatic stage is represented by pyrite-quartz phase; hydrothermal stage is represented by pyrite-carbonate-quartz and gold-polysulfide-quartz phases; supergene stage is represented by bornite-goethite phase. It has been established that the gold-polysulfide-quartz phase of the hydrothermal stage of ore formation is productive, wherein native gold is in close paragenetic association with chalcopyrite of the second generation and quartz of the third generation. The fineness of native gold is within the range from 633.1 to 948 ‰, with silver being the primary admixture.