Dunn, PG 2009, 'Hydroscaling technology for rapid drift development', in PM Dight (ed.), Proceedings of the First International Seminar on Safe and Rapid Development Mining
, Australian Centre for Geomechanics, Perth, pp. 61-67.
Rapid drift development is still a high priority for many mining companies, as it can reduce costs and also
access orebodies faster to increase net present values significantly for any operation. Hydroscaling (water
jet scaling) trials have been conducted at various mine sites in Canada and also at Perseverance Mine,
Western Australia, Australia, to evaluate this as a potential technology to enhance rapid drift development.
The technology in each of these cases removed most of the loose rock within the different rock mass
conditions experienced. The success of hydroscaling was measured by either checking the scaling manually
or monitoring the shotcrete spraying activity afterwards to monitor rockfalls. During shotcreting, prior to
the trials, rockfalls always occurred, whilst there was minimal rockfall after hydroscaling. Monitoring of the
shotcrete spraying process prior to trials, and after hydroscaling, has demonstrated an improvement in
reduced rock and shotcrete fall out, with commensurate reduction in re-work required. This paper proposes
that hydroscaling is now ready for implementation as a technology across a wide range of rock mass
conditions and summarises the role for technology within a rapid drift development context.
Dunn, P.G., Muldowney, J.D. and Maybee, G. (2003) Water Jet Scaling Investigation; Phase II — Water Jet Scaling
Field Tests at Fecunis Adit, Report Funded by Inco, Falconbridge and Placer Dome, Report No. CMT 02/02,
Dunn, P.G., Muldowney, J.D. and Maybee, G. (2002) Water Jet Scaling Investigation; Phase I — Water Jet Scaling
Investigation (Stage 1 and 2), Report Funded by Inco, Falconbridge and Placer Dome, Report No. CMT 01/02,
Dunn, P.G., Whitmore, J. and Muldowney, J.D. (2005) Hydroscaling trials at Perseverance Mine, Hydroscaling
Investigation funded by WMC Resources and Placer Dome Inc., MIRARCO report 04-027, July 2005.
Dunn, P.G., Whitmore, J., Szwedzicki, T., Robb, A., McHugh, C., Maciejewski, L. and Blythe, M. (2006) Hydroscaling
Technology for Rapid Drift Development, Second International Symposium on Rapid Mine Development,
Aachen, Germany, June 2006, pp. 41–54.
Jenkins, P.A., Mitchell, J. and Upton, B. (2005) Improved Ground Control Using Hydro Scaling and In-Cycle
Shotcrete, 9th AusIMM Underground Operators’ Conference, Perth, Australia, March 2005, CD format only.
Suorineni, F.T. and Kaiser, P.K. (2006) Safe Rapid Drifting - Geomechanical Challenges and Practical Constraints,
Second International Symposium on Rapid Mine Development, Aachen, Germany, June 2006, pp. 159–176.
Hydroscaling technology for rapid drift development P.G. Dunn
68 SRDM 2009, Perth, Australia