1. © 2009 GSS Pty Ltd 1 SDRB S YSTEM USING P UMPABLE R ESIN  Considerable improvements to the crawler rig  Development work on a new pumpable resin including investigations into resin viscosity and pumping pressures to reduce installation cycle times  Development of an improved resin sealing system  Underground 1,000 bolt trial planned with Xstrata is imminent  Considerable improvements to the crawler rig  Development work on a new pumpable resin including investigations into resin viscosity and pumping pressures to reduce installation cycle times  Development of an improved resin sealing system  Underground 1,000 bolt trial planned with Xstrata is imminent Large ‘Swirl Chamber’ for efficient cuttings removal Small annulus to generate high load- transfer capacity Use of pumpable, low viscosity, fast set resin for immediate, high capacity roof support Long Nut for:  bolt alignment  maximising Nut thread strength  drilling rotation  axial thrust  tensioning Injection sleeve for:  large diameter injection nozzle  Nut stop rotation  self-centering & bolt alignment New, custom designed Drill Bit with aggressive profile for fast penetration Welded Drill Bit with stabilising tang for high axial thrust New, micro-alloyed, thick-walled steel hollow bar for:  high strength & good ductility  maximising resin flow  enabling high axial thrust Continuous, coarse profile to provide high load transfer capacity New internal seals to ensure perfect sealing for every bolt every time M27 x 3mm pitch cold-rolled thread for Nut tensioning Full column resin encapsulation for maximum roof support & to minimise corrosion Separate Domed Ball for angled bolts Large ‘Swirl Chamber’ for efficient cuttings removal Small annulus to generate high load- transfer capacity Use of pumpable, low viscosity, fast set resin for immediate, high capacity roof support Long Nut for:  bolt alignment  maximising Nut thread strength  drilling rotation  axial thrust  tensioning Injection sleeve for:  large diameter injection nozzle  Nut stop rotation  self-centering & bolt alignment New, custom designed Drill Bit with aggressive profile for fast penetration Welded Drill Bit with stabilising tang for high axial thrust New, micro-alloyed, thick-walled steel hollow bar for:  high strength & good ductility  maximising resin flow  enabling high axial thrust Continuous, coarse profile to provide high load transfer capacity New internal seals to ensure perfect sealing for every bolt every time M27 x 3mm pitch cold-rolled thread for Nut tensioning Full column resin encapsulation for maximum roof support & to minimise corrosion Separate Domed Ball for angled bolts Large ‘Swirl Chamber’ for efficient cuttings removal Small annulus to generate high load- transfer capacity Use of pumpable, low viscosity, fast set resin for immediate, high capacity roof support Long Nut for:  bolt alignment  maximising Nut thread strength  drilling rotation  axial thrust  tensioning Injection sleeve for:  large diameter injection nozzle  Nut stop rotation  self-centering & bolt alignment New, custom designed Drill Bit with aggressive profile for fast penetration Welded Drill Bit with stabilising tang for high axial thrust New, micro-alloyed, thick-walled steel hollow bar for:  high strength & good ductility  maximising resin flow  enabling high axial thrust Continuous, coarse profile to provide high load transfer capacity New internal seals to ensure perfect sealing for every bolt every time M27 x 3mm pitch cold-rolled thread for Nut tensioning Full column resin encapsulation for maximum roof support & to minimise corrosion Separate Domed Ball for angled bolts Considerable development work has been undertaken to improve the overall system, specifically: