|The Muruntau gold deposit, Tamdy Mountains, Uzbekistan|
Byron Berger, US Geological Survey, Denver, CO, USA
in - Porter, T.M. (Ed), 1998 - Porphyry and Hydrothermal Copper and Gold Deposits: A Global Perspective; PGC Publishing, Adelaide, pp 213-221.
The Muruntau gold deposit, Uzbekistan, is localized in a shear zone related to upper Carboniferous to lower Permian accretion of the Kazakhstan-North Tien Shan and Karakum-Tarim tectonic plates. The gold ore was deposited syndeformationally in an extensional stepover along a northwest-striking left-lateral fault zone under ductile to brittle conditions. The host rocks are carbonaceous shales, siltstones, sandstones, and chert. Early stage alteration was quartz-albite-biotite-chlorite-oligoclase with some pyrite and gold. The predominant period of gold-sulphide deposition accompanied K-feldspar, phlogopite, muscovite, Mg-Chlorite, and Fe-Mn carbonate alteration. Later stage veinlets contain tourmaline, and the latest stage of alteration was calcite veinlets with pyrite, TiO2 and rare-earth element minerals.
Muruntau is probably the greatest gold deposit in the world, with a global resource of more than 1 Gt @ 3.5 to 4 g/t Au for 4500 to 5000 t of contained gold (140 to 150 Moz) amenable to open pit extraction. The current pit is approximately 2.5 x 3.5 km and 300 m deep. It produces around 64 t (2 Moz)of gold per year. Mineralisation occurs as a stockwork vein system within asequence of lower Palaeozoic carbonaceous sediments, and is associated with syn-deformational granitoid intrusion in a structurally complex zone. The orebody is located within the great South Tien Shan gold belt.
Note: The second paragraph was an additional editors resumé added to supply more detail for this web site entry.
This book is NOW AVAILABLE FOR ORDER via the web by selecting the BUY button above.
This abstract was printed from the PGC Publishing website https://portergeo.com.au/publishing.