Gold–Telluride Mineralization in Pb–Zn–Fe Ores of the Aktash Skarn Deposit (Western Karamazar, Tajikistan)

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Abstract The article describes magnetite–sulfide assemblages of minerals containing native gold and tellurides in the Pb–Zn–Fe ores of the Aktash skarn deposit in Western Karamazar (Tajikistan). Gold–silver–telluride mineralization is represented by products of a multistage ore process. It has been established that native gold is concentrated both in magnetite and in association with sulfide minerals. A decrease in the fineness of native gold from its early to late varieties was revealed: 725–905‰ in magnetite → 656–699‰ in pyrite-pyrrhotite ores → up to 290‰ in association with galena and bismuth-bearing minerals. The regular decrease in the fineness of native gold and paragenetic relationship with various bismuth minerals (native bismuth, bismuthite, aikinite, Ag–bearing aikinite, uytenbogaardtite, Ag–Au–Bi–S phases) reflect a decrease in temperature and sulfur fugacity of mineral-forming fluids. Tellurides are found in magnetite-chalcopyrite-pyrite-pyrrhotite ores and are represented by tsumoite, pilsenite, hessite and stützite. Electron backscatter diffraction (EBSD) patterns of tsumoite and pilsenite confirmed the predominant presence of tsumoite in the ores.

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