Mineralogical-geochemical features and ore content of black schists, Middle Timan

Basic information on the mineralogical, geochemical, isotope-geochemical peculiarities and ore content of the black schists of the Paunsky suite of the Upper Riphean Tsilemsky and Vorykvinsko-Svetlinsky regions is given, and carbon-bearing schists of the Lunvozh suite of the Middle Riphean Kyvvozhsky region in Middle Timan were studied. It is shown that black schists are characterized by the sulfide mineralization of wide development. Along with pyrite, there are galenite, chalcopyrite, sphalerite, gersdorffite, cobaltite, and rare-earth minerals - xenotime and monazite. With regard to ore content, black schists of the Vorykvinsko-Svetlinsky region are of the greatest interest, characterized by a high content of gold, elements of the platinum group, rare and rare-earth elements. The increased gold content is also noted in black schists of the Tsilemsky region. In carbon-bearing schists of the Lunvozh suite of the Kyvvozhsky region, no significant gold and platinoid contents were found. However, due to the presence of close wash-down gold-bearing placers in this region and the problem of searching for native ore occurrences, a more detailed study of the rocks themselves and the zones of overlapping sulfide mineralization is necessary.