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Blast Force Containment

MREL (Mining Resource Engineering Ltd) tested stemming movement and ejection velocity. The longer time to stemming movement and the lower stemming ejection velocity means more blast energy is retained in the bore hole. Energy is directed into the rock, and not lost into the air. There is better fragmentation, less flyrock, and a reduction in noise. Using VARI-STEMĀ® with standard rock stemming, stemming movement was slowed 100% and stemming ejection velocity was reduced 44%.
 
 

NO PLUG

VARI-STEMĀ®PLUG

ANFO*
Velocity of
Detonation

12,000 ft/sec

12,020 ft/sec

Time To
Stemming
Movement

2.3 msec

5.3 msec

Stemming
Velocity

1,580 ft/sec

920 ft/sec

*Similar "ANFO Velocity of Detonation" shows equal
ANFO explosive force occurred in all tests