Gold and silver mineralogy is studied in ores of the Yubileinoe porphyry gold deposit (Kazakhstan). Native gold is the major gold mineral. Its fneness varies from 970‰ in magnetite-hematite assemblage to 733–860‰ in pyrite-chalcopyrite assemblage. Silver occurs as admixture in native gold and, occasionally, as silver telluride. Native gold is associated with bi and Pb minerals: rucklidgeite, galenaclaustalite, and tetradymite-kawazulite. According to chlorite geothermometry, the Au, Ag and bi minerals precipitated at temperatures of 250-230 °С. These features are typical of the porphyry gold deposits worldwide.

Figures 5. Tables 3. References 17.

Key words: Urals, Kazakhstan, pophyry deposits, Yubileinoe deposit, mineralogy, gold, silver

O.Yu. Plotinskaya, Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry RAS, Staromonenty per. 35, Moscow, 119017 Russia; plotin@igem.ru

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