Abstract
Own Se minerals, first established in primary ores of VMS deposits of the Urals, are described. Instrumental neutron activation analysis of bulk ore samples, mineral monofractions and local methods of analysis: LA-ICP- MS, electron probe microanalysis and analytical electron microscopy were used. CSe in ores of the Urals to 977 g/t. Significant positive correlation of Se with Te, S, Fe, Co, Mo, Hg, Bi is characteristic. Selenium is con- centrated in the main sulfides, mainly in pyrite (73 g/t), chalcopyrite 49 g/t, pyrrhotite 48 g/t; in sphalerite usually <10 g/t. High Se content (up to 1–3 wt.%) occurs in the minor and rare minerals from massive sulfide ores (mainly compounds of Pb, Te, Bi): tetradymite, galena, tellurobismuthite, altaite, wittichenite. Own Se minerals in ores are represented by kawazulite, clausthalite, galena-clausthalite Pb(Se,S), micron inclusions composition (Ag, Cu)2(Se, S), (Ag, Pb)3(Te, Se)S, (Ag, Pb)2(S, Se).
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