Final Bolt Up Sequence Stage
The face is meshed using angled bolts from stage 7 and bolts where needed to hold the mesh onto the face. A rib strap is installed along the bottom of the mesh and bolted every 1 metre.
This now completes the bolt up cycle. The bolts that were used at this mine were 2.1 metre mild steel bolts. A mild steel bolt was used rather than a high tensile bolt because it is able to bend more.
The conditions at South Bulli did not require support to be installed at the maingate or tailgate. Some other mines in the Ilawarra region do provide support to the gate roads.This support is in the form of either:
- Polyurethane Resin injections into the tailgate, maingate and face areas
- Flexi Bolts (Cable Bolts ??)