Tunnels under pressure in an ultradeep Witwatersrand gold ...
Tunnels under pressure in an ultradeep Witwatersrand gold mine 3000 m below surface, and that is the need for fabrictype support at depth. Access to 4km Before I describe the art of tunnelling at ultra depths, it is necessary to explain how we get there in the first place. Western Deep Levels would be a good example to explain access to great ...
WhatsApp





















