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Typomorphic minerals oxidation zone of gold-copper porphyry ore of the Malmyzh deposit (Svoboda)

V.G. Kryukov, N.A. Lavrik, N.M. Litvinova, V.F. Stepanova

Original article

DOI https://doi.org/10.18599/grs.2019.3.91-98

91-98
rus.

open access

Under a Creative Commons license

The Malmyzh gold-copper porphyry deposit located in the central part of the Khabarovsk region has a rather developed oxidation zone. The object was identified during the exploration and evaluation work in the 70s, but received a negative assessment in terms of prospects for ore gold. LLC “Amur-Minerals” began to geological study of Malmyzh zone in 2005. Exploration work continues at the present time. The mineral composition of primary ore deposits is well studied. While the common minerals like a limonite and goethite are marked for the oxidation zone the most of minerals that may have a typomorphic meaning in solving genetic and other issues are beyond the purview of researchers. The study relevance of the mineral composition of the oxidation zone are due to the fact that its share and intensively oxidized ores account for up to 7% of gold and copper.
The authors carried out a mineralogical and technological composition research of the oxidation zone of one of the sites of the Malmyzh deposit using small technological samples. The main part of samples is kaolinized and limonitized diorite porphyrites. In the oxidized ores, there are: limonite, goethite, magnetite, pyrite, less often – arsenopyrite, galena, sphalerite, chalcopyrite, and developed on copper and iron sulfides, covelline, bornite, azurite and malachite. Visible grains (0,2-0,7 mm) were established using mineralogical analysis including instrumental. They are: native gold, platinum, platinum zirconium intermetallic, copper, aluminum, zinc; diamonds are typomorphic minerals of both practical and theoretical importance. Blast tube consisting magmatic-hydrothermal breccias was opened in the northwestern part of site.
Thus, the association of the listed minerals is unique and allows to restore the conditions of formation of the oxidation zone and the genesis of primary ores.

 

Malmyzh deposit, Svoboda site, porphyry ore, oxidation zone, mineralogical analysis, gold, platinum, diamonds

 

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Viktor G. Kryukov
Institute of Mining of the Far Eastern Branch of the Russian Academy of Sciences
51 Turgenev st., Khabarovsk, 680000, Russian Federation

Natalya A. Lavrik
Institute of Mining of the Far Eastern Branch of the Russian Academy of Sciences
51 Turgenev st., Khabarovsk, 680000, Russian Federation
E-mail: lavrik@igd.khv.ru

Natalya M. Litvinova
Institute of Mining of the Far Eastern Branch of the Russian Academy of Sciences
51 Turgenev st., Khabarovsk, 680000, Russian Federation

Valentina F. Stepanova
Institute of Mining of the Far Eastern Branch of the Russian Academy of Sciences
51 Turgenev st., Khabarovsk, 680000, Russian Federation

 

For citation:

Kryukov V.G., Lavrik N.A., Litvinova N.M., Stepanova V.F. (2019). Typomorphic minerals oxidation zone of gold-copper porphyry ore of the Malmyzh deposit (Svoboda). Georesursy = Georesources, 21(3), pp. 91‑98. DOI: https://doi.org/10.18599/grs.2019.3.91-98