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Krasnooktyabrsk |
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Kazakhstan |
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Al
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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The Krasnooktyabr'sk bauxite deposit is located in Kazakhstan, near the eastern margin of the Ural Mountains, ~275 km SE of Magnitogorsk (#Location: 52° 00' 56"N, 62° 21' 42"E).
The deposit is overlain by an average of 40 m of Cenozoic sediments. The basement to mineralisation is composed of lower Carboniferous carbonates, and by intermediate volcanics and associated sediments which have been cut by small diorite and plagiogranite porphyry intrusions.
The surface of the basement has been complicated by fault related valleys and erosion-karst depressions within the carbonates, and by a superimposed weathering crust. Depressions formed by these processes are filled with Mesozoic to Cenozoic bauxitic sediments. Twenty four ore accumulations are known, each separated by either carbonate ridges or by non-ore clays. All are over limestones in karst-erosional, karst-basinal or karst-depressions which formed palaeo-topographic lows, directly influencing the morphology and location of the individual ore accumulations. These accumulations have both linear and equi-dimensional outlines, or a combination of both, but have complicated outlines with splitting on the flanks. The largest accumulations are found at the contact between andesites and limestone (Smirnov, 1977).
The bauxite bearing sediments have been divided into two horizons, an upper and a lower, separated by sub-ore clays. The bauxite bearing mottled clays of the ore horizon vary from a few, up to 120 m in thickness. The bauxites include stony (35%), friable (57%), saccharoidal and argillaceous (8%) varieties. Kaolinite-lignite clays up to 20 m thick are found in the upper portion of the ore horizon, in the thickest accumulations. The bauxite unit is dated as Turonian to Santonian, ie. lower Late Cretaceous, on the basis of spore palaeontology (Smirnov, 1977).
The principal ore minerals are gibbsite, hydrohematite, hematite and kaolinite, with minor siderite and calcite and less frequently chamosite (chlorite), pyrite and marcasite. The composition of the bauxite is: 41.8 to 50% Al2O3, 5.2 to 14% SiO2, 7.2 to 24.2% Fe2O3. The ores are divided into hydrochemical, clinker and metallurgical varieties (Smirnov, 1977).
Remaining ore reserves and mineral resources at December 31, 2012 (ENRC Annual Report, 2012), were:
Open-pit - proved + probable reserves - 89.5 Mt @ 43.1% Al2O3;
Open-pit - measured + indicated + inferred resources - 94.7 Mt @ 43.5% Al2O3.
The most recent source geological information used to prepare this decription was dated: 1996.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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