Typical Quarry Blast PatternPictured here is your typical Quarry Blast Pattern.
In most New Zealand situations three or four rows of blast holes are used and most blasts are to a "free face".
Drill hole angles range from vertical to 15 degrees in most situations.
ANFO LoadingAs part of the simple blast hole loading process a pre-determined amount of ANFO is continuously poured into the blast hole and an inert rod is used to check the rising explosive column to ensure planned final stemming lengths are met.
ANFO is a very effective blasting agent however modern pricing has seen blended bulk explosive products preferred.
Blast ResultsThe use of Non Electric (Nonel) explosives for initiation in New Zealand provides a result at reasonably low cost.
With so many options available to the shot firer when using Electronic Initiation amazing results can be achieved.
From our experience if used wisely Electronic Detonators provide significant downstream cost savings to the site through improved fragmentation and dig-ability.
If you would like to speak to our experienced staff please don't hesitate to contact us...