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The gold-bearing veins of the North Urals contain rare mineral selenium phases such as kawazulite, clausthalite, bohdanowiczite, volynskite, soucekite, naumannite, and eucairite, new for this region. They are largely observed as the finest inclusions in copper sulfides and closely associate with bismuth and tellurium minerals. Selenides were formed at the final oregenesis stages. Selenium was likely taken from the host rocks in the course of hydrothermal metasomatic processes initiated by granite intrusions. [ABSTRACT FROM AUTHOR]

The article focuses on the thematic investigations carried out by a geological group of the Institute of Geology, Komi Science Center, Ural Division, Russian Academy of Sciences concerning the lithochemistry of the Upper Precambrian deposits of the Manitanyrd Ridge, the Polar Urals in Russia. The investigation includes the collected 85 samples in the section along Goluboi Brook and five samples collected on neighboring Bezymyannyi Brook. It presents six conclusions based on the materials described including that in spite of quite diverse petrographic signs of igneous, stable chemical composition is an Ariadnes's thread in determination of their genesis.