Friday, 9 February 2007
Who's Twisted Now?
Gold, Silver, Uranium and Copper are relatively plentiful in Outback South Australia and are mined in places like Roxby Downs. The miners sink a deep shaft and branch out with "drives", or horizontal tunnels at the appropriate locations. These drives suffer from falling rocks which can endanger the miners and so steel mesh is suspended from the ceilings and fixed with "rock anchors". The rock anchors in today's photo are fabricated from deformed steel rods which are twisted in this lathe, to create a greater surface area to be chemically grouted in position, in holes drilled in the ceilings of the Drives. This photo shows how that is achieved in a workshop in Adelaide.
Roxby Downs is 510 kilometres (as the crow flies) north of Adelaide, and on Google Earth go to 30 33 47 S, 136 53 44 E. February in Adelaide: no worries.