THE BAKYRCHIK GOLD-CARBONACEOUS-SULPHIDE DEPOSIT
Zholtaev G.Z. Umarbekova Z.T. Ozdoev S.M. Miniskul S.D. Bakesheva A.Т.
2024National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2024#2024Issue 279 - 90 pp.
Black-shale gold ore deposits have enormous reserves of hard-to-recover gold. Thus, in Russia the predominant part of ledge gold reserves was found in deposits of carbonaceous-terrigenous complexes. These deposits are represented by sites of varying scale, from small to unique ones (Olympiada, Nezhdaninskoye, Natalkinskoye, Mayskoye, Sovetskoye in Russia; Muruntau, Kokpatas, Zarmitan, Daugyztau, Amantaitau in Uzbekistan; Bakyrchik in Kazakhstan; Chore in Tajikistan; and Kumtor in Kyrgyzstan; Maser Lode in the United States; Bendigo, Olympic Dam in Australia). The Bakyrchik deposit is located in the Kyzyl latitudinal strike contortion zone that cuts across the main structures of the Kalba region. The ore-hosting carbonaceous shale, mudstones, siltstones and sandstones are placed in a thin-rhythmic interbedded Bukon’ suite of Middle Carboniferous age. The deposit was conditioned by collision zones. The rocks are intensely foliated, containing carbonaceous matter and sulphides (up to 5–10 %). Siltstones are most rich in gold-bearing sulphides (pyrite and arsenopyrite) and contain 0.2–0.4 % carbonaceous material in the presence of carbonate material. The ore bodies are represented by a system of cumulative mineralised zones of considerable thickness (up to 20 m). Ore composition: pyrite, arsenopyrite, antimonite, gold, marcasite, chalcopyrite, pyrrhotite, faint ores (tennantite and tetrahedrite), galena, sphalerite, cinnabar, native silver, quartz, carbonates. Pyrite of pentagon dodecahedral habitus and needle-shaped arsenopyrite are gold-bearing. The mineralization of complex polygenic nature with multiple transformation of syngenetic sedimentary gold-bearing material in the near-fault zone of dislocation-thermal metamorphism belongs to the type of mineralized zones of the gold-sulphide type.
carbonaceous-terrigenous , collision zones , deposit , gold
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Institute of Geological Sciences named after K. Satbayev, Almaty, Kazakhstan
Satbayev University, Almaty, Kazakhstan
Institute of Geological Sciences named after K. Satbayev
Satbayev University
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