Co and Ni minerals are described in ores of the Mikheevskoe porphyry copper deposit (South Urals, Russia). Minerals of the cobaltite–gersdorfte series (CoAsS–NiAsS), violarite (FeNi2S4), millerite (NiS), pentlandite (Ni5.5Fe3.4)8.9S8.0 and melonite (NiTe2) are identifed. They overgrow pyrite, chalcopyrite and bornite and belong to late low-temperature assemblages. Cobalt and Ni are also incorporated in pyrite. The latter, being the most widespread mineral of the deposit, is a major carrier of these metals. The variability of Co and Ni minerals is determined by the presence of serpentinites, which replaced ultramafc rocks.

Keywords: Urals, porphyry copper deposits, Mikheevskoe, cobalt, nickel, mineralogy

Funding. This work is supported by state contract of the Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry RAS.

Acknowledgements. The authors thank А.N. Nekrasov and N.N Koshlyakova for EDS analyses and D.A. Chistyakova for help with data processing. The authors are also thankful to an anonymous reviewer for constructive comments.

Confict of interest. The authors declare that there are no conficts of interest related to this manuscript.

Author contribution. O.Yu. Plotinskaya – conceptualization, investigation, writing; E.V. Kovalchuk – analytical work. All the authors approved the fnal version of the manuscript prior to publication.
For citation: Plotinskaya O.Yu., Kovalchuk E.V. Co and Тi minerals in ores of the Mikheevskoe porphyry Cu deposit (South Urals). Mineralogy, 2025, 11(1), 17–27. DOI: 10.35597/2313-545X-2025-11-1-2

Received 11.11.2024, revised 05.12.2024, accepted 15.01.2025

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

E.V. Kovalchuk, Sergo Ordzhonikidze Russian State University for Geological Prospecting (MGRI), Moscow,  Russia

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