Most hard-rock quarries use explosives, which are plugged into holes drilled in the rock face. When they are detonated the rock face shatters outwards onto the quarry floor. The rocks are then put into crushers which gradually reduce them to small pieces. Watch footage from a blast at Wilsonville limestone quarry, near Whāngārei, which supplies a cement works.
Using this item
Orica Mining Services
Video by Ian Hamilton
This item has been provided for private study purposes (such as school projects, family and local history research) and any published reproduction (print or electronic) may infringe copyright law. It is the responsibility of the user of any material to obtain clearance from the copyright holder.