Quarry Blasting

Typical Quarry Blast Pattern

Pictured 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 Loading

As 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.

Blast Results

The use of Non Electric (Nonel) explosives for initiation in New Zealand provides a result at low cost. With some many options available to the shot firer when using Electronic Initiation amazing results can be achieved. From my personal experience if used wisely Electronic Detonators provide significant downstream cost savings to the site but no cost analysis has ever been completed within the quarry sector to accurately provide this information to the Quarry Managers in New Zealand.
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