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Akchatau |
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Kazakhstan |
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W
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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 Akchatau wolframite deposit is located 150 km north of Balkash in Kazakhstan and occurs as a greisen vein system within a 300±10 Ma late Carboniferous 26 x 10 km granitic massif. The host granite intrudes a sequence composed of Silurian sandstones, siltstones and argillites; Devonian andesites, rhyolite tuffs and tuffaceous sediments; and Carboniferous volcanogenic formations, ranging from andesites to rhyolites. Intrusive activity was widespread in the region in the Carboniferous and Permian, with numerous plutons, vent formations, sub-volcanic intrusives and dykes (Smirnov, 1977).
The mineralisation occurs as a series of greisen bodies within both the granite and adamellite, near the contact with hornfelsed sediments which are only poorly altered and mineralised. The greisen bodies are thin, vein like and feathering, and occur as clusters. More than 300 greisen vein bodies are known in the deposit, separated into a number of types, with the bulk of the ore being in thick, zoned quartz and quartz-topaz greisen bodies. The orebodies are most commonly composed of several generations of quartz, with muscovite, topaz and pyrite, and less abundant wolframite, molybdenite and fluorite. Wolframite is very un-evenly distributed within the veins, confined to the axial and near selvage portions, and ranging from hundredths of a mm to segregations that are 20 to 50 mm across (Smirnov, 1977).
Production in the early 1990s amounted to around 0.2 Mt @ 0.185% WO3 per annum.
The most recent source geological information used to prepare this decription was dated: 1997.
This description is a summary from published sources, the chief of which are listed below.
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