Case Study Maintaining Final Wall Integrity by Reducing Backbreak Winstone Aggregates’ Hunua Quarry, New Zealand Page 1 | © Copyright Orica Limited Group www.oricaminingservices.com | Document reference:100001 The Situation Winstone Aggregates’ Hunua Quarry is New Zealand’s largest operating quarry. The quarry produces over one million cubic metres of crushed rock annually for the Auckland and North Island road and constructi

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