"Can I ask a really stupid q - how do you get gold out from 1km+ out of the ground? I'm used to couple of hundred - but a km? Wow - long way down"
South African gold mines go down around 4 km, (using a headframe and shaft deeper than that and heat becomes unbearable (airconditioned even at 2km) and there are seismic issues
deep seated mineralisation first hit!!! :) , page-9
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