National Geographic MegaStructures Tau Tona City Of Gold
MegaStructures: Tau Tona City Of Gold
Mega Structures: Tau Tona City Of Gold
National Geographic Megastructures Tau Tona City Of Gold
Click to viewLocated near Johannesburg, South Africa, the Tau Tona is a gold mine. The Tau Tona is the main economic life blood of Johannesburg, supplying half the world’s gold needs. It is the deepest and largest working mine in the world. Its main shaft is 3.6 km deep and consists of 800 km of tunneling. This episode gives viewers a tour of the dynamic systems involved in maintaining a working environment deep in the earth. It also provides a glimpse of what life as a mine worker is like in Tau Tona. Risking heat exhaustion, and with 10 earthquakes a day, the miners work through narrow tunnels to extract gold from a 25 cm thick gold vein.
The TauTona Mine or Western Deep No.3 Shaft, is a gold mine in South Africa. At some 3.9 kilometers (2.4 mi) deep it is currently home to the world's deepest mining operations.
In 2006 AngloGold Ashanti commenced a project to extend its South African TauTona gold mine to 3.9km. This was completed in 2008 making it the world’s deepest mine, surpassing the 3,585m deep East Rand Mine by a good distance. The name TauTona means "great lion" in the Setswana language.
The TauTona mine exists within the West Witts area not so far from Johannesburg in South Africa, near the town of Carletonville. TauTona neighbours the Mponeng and Savukamines, and TauTona and Savuka share processing facilities. All three are owned by AngloGold Ashanti.
Production at TauTona fell to 409,000 ounces in 2007, down from 474,000 ounces in 2006, due to increased seismic activity.
This required a review of the practice of mining of shaft pillars and high-grade remnants, and delays to the build-up in volume caused by opening up of the sequential grid. Capital expenditure in Siguiri was R2.5bn ($US71m) in 2007, with 56% committed to the development of ore reserve.
TauTona accounted for 7% of AngloGold Ashanti’s total 2007 gold production.
The mine was originally built by the Anglo American Corporationwith its 2km deep main shaft being sunk in 1957, with operations starting in 1962.
Since its construction two secondary shafts have been added bringing the mine to its current depth. The mine today has some 800km of tunnels and employs some 5600 miners. It is an extremely dangerous environment, with five workers losing their lives in 2007.
The mine is so deep that temperatures in the mine can rise to dangerous levels. Air conditioning equipment is used to cool the mine from 55°C down to a more tolerable 28°C. The rock face temperature currently reaches 60°C.
The journey to the rock face can take one hour from surface level. The lift cage that transports the workers from the surface to the bottom travels at 16 meters a second. The mine has also been featured on the MegaStructures programme produced by National Geographic.
Sources Wikipedia and Mining Technology
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