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Bulk Loading of Emulsion Explosives in Shaft Sinking

Author:  R.J. Roach, Dyno Nobel Ltd, Sudbury, Ontario, Canada
              D. Roy, Dyno Nobel Ltd, Brossard, Quebec, Canada

Abstract:

After many months of discussion on ways and means to improve productivity in the shaft sinking process, it was decided to look at those areas where, historically, methods have been stagnant for many years.  These categories included drilling, hole diameter, drill patterns, explosive types, explosive loads, initiation techniques, cut design, wall control, fragmentation and heated magazines.

With those subjects in mind, the time and footage that it took to sink the150 foot collar was used to establish the use of four independent electric hydraulic jumbos for the drilling of two inch diameter blast holes.  This allowed us to eliminate the need of traditional cartridged explosives.

Relying on the knowledge and experience of explosive experts, the decision was made to use a pneumatic extrusion method to load bulk emulsion into the two inch blast holes.

These innovative advancements allowed the patterns to be extended, plugged holes to be eliminated and the loading cycle time to be reduced by nearly three hours.  Most importantly, the sufficient free face, provided by a suitable cut design, allowed full face rounds with 16.5 foot long boreholes to be pulled.
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