Mponeng Gold Mine
Lua error in Module:Infobox at line 166: malformed pattern (missing ']'). Mponeng is a gold mine in South Africa's North West Province. It extends over 4 kilometres (2.5 mi) below the surface,[1] and is considered to be one of the most substantial gold mines in the world.[2] It is also currently the world's deepest mine.[3] The trip from the surface to the bottom of the mine takes over an hour.[1]
Over 5400 metric tonnes of rock are excavated from Mponeng each day.[1] At a cost of $19.4 per gram of gold extracted, the mine needs to recover only 10 grams of gold per ton excavated to remain profitable.[1] The mine contains at least two gold reefs, with the deepest one metre thick.[1]
The temperature of the rock reaches 66 °C (151 °F), and the mine pumps slurry ice underground to cool the tunnel air below 30 °C (86 °F).[1] A mixture of concrete, water, and rock is packed into excavated areas, which further acts as an insulator.[1] Tunnel walls are secured by flexible shotcrete reinforced with steel fibers, which is further held in place by diamond-mesh netting.[1]
The endemic bacterium Desulforudis audaxviator was discovered within groundwater samples.[4]
Danny Forster visited this mine to do an episode of Build It Bigger for season number three.
References
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