Gold-bearing copper ores of Voronov Bor deposit in Paleoproterozoic sediments of Karelia
Copper sulfide ore deposit Voronov Bor is located northward from Onega structure and occurs among Paleoproterozoic quartzite-sandstones. Formation of chalcopyrite-bornite ores was foregone by alkaline metasomatism including input of Na, K, Zr, Ti, P, Ba, and, subsequently, spreading in host rocks of microcline, albite, phengite, titanite, zircon, apatite, barite. Copper ores have the low-temperature hydrothermal genesis (270-100 °Ñ). They contain Cu, Mo, Co, Ag, Au, Pb, Se, U, and are composed of chalcopyrite, bornite, chalcocite, molybdenite and some more rare minerals. Chalcopyrite ores contain commonly molybdenite, the bornite ones are remarkable by presence of galena, Se-galena, clausthalite, naumannite, Ag-gold, electrum, küstelite, native silver, acanthite, rheniite, greenockite. Bornite ores are enriched in Au (2.4-3.7 ppm), and there was detected Cu-Os-rheniite, for the first time in Karelia.