Story: Rock, limestone and clay

Blasting, Wilsonville quarry

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

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How to cite this page:

Carl Walrond, 'Rock, limestone and clay - Sources and uses', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/en/video/5216/blasting-wilsonville-quarry (accessed 4 June 2020)

Story by Carl Walrond, published 12 Jun 2006