To the mineralogy of some ore occurrences of Bolshevik Island

Abstract

The article presents the characteristics of some occurrences of Bolshevik Island. Quartz-pyrite veinlets with galena inclusions are noted in the black shales of the Golyshevskaya area. An admixture of Co and As is noted in the pyrite, and the manifestation of calcite graphitization and potassium metasomatism is noted in the shales. The content of Pb, As, Au in the veinlets corresponds to the ore level. Mineralization on Cape Mordovina is represented by cassiterite-sulfide-quartz veins in hornfelses. Sulfides of As, Cu, Zn, Pb, bismuth sulfotellurides, muscovite and pyrophyllite are diagnosed here. The presence of cassiterite, arsenopyrite, and bismuth minerals indicate a connection between hydrothermal formations and crustal granites. The contents of Cu, Zn, As, Cd, In, Sn, Ta, Ag, Pb, Bi, Au are related to the ore level. Galena, sphalerite, pyrite, and acanthite have been diagnosed in the sulfide-carbonate-quartz vein of the Norinsky site. The content of Zn, Ag, Cd, and Pb in it corresponds to the ore level, which allows it to be attributed to the silver-polymetallic association.