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Ōamaru Stone has been a cornerstone of architectural projects for generations, providing the natural limestone featured in some of our designs. In this Q&A, Operations Manager Dustin offers insights into the geological history, sustainability initiatives, and innovative technology that keep their quarry at the forefront of stone production.
Q. Why is the region of Ōamaru special in terms of geology and the production of this unique stone?
A. Limestone is quite prevalent throughout New Zealand and, indeed, the world. In terms of stone, it is young and has not been subject to the massive pressures that create marbles and similar materials. Our limestone quarry is very pure, with over 98% calcium carbonate, which means we have very few fractures. Once we dig deep enough, the color is a brilliant white. Stone closer to the surface contains some clay, giving it a caramel color, which is also quite popular. Our limestone quarry is the last of its kind in New Zealand and has been producing building stone since 1906. My brother and I are very proud to be the seventh generation of our family still working the quarry.
Q. What are some characteristics of Ōamaru Stone that make it stand out in architectural and design projects?
A. The stone brings a real presence to any project that incorporates it. You get a feeling of permanence from natural stone that is unlike any other material used in architecture or design. Even in its purest white form, it somehow creates warmth. I believe that, as humans, we experience a sense of calmness from natural materials in our living spaces.
Q. Are there any initiatives in place for ensuring the long-term preservation of the quarry and the natural environment surrounding it?
A. Absolutely. We are very conscious of this natural resource we have. We’ve reduced waste through technological improvements, which allow us to utilise 78% of all stone quarried from our mines as building products. The remaining 22% is crushed and used as a soil conditioner by local farmers in our district, so we’re very happy to achieve 100% utilisation of every ton of stone quarried. We also reinstate spent mines with the soil removed during the quarrying process. In most cases, the land is returned to pasture, but we’re now planting more native trees and bushes in these areas to further improve the land.
Q. What are some recent innovations or techniques in working with Ōamaru Stone that have excited you?
A. The introduction of our 5-axis CNC machine with full CAD capabilities has opened avenues I never thought of. Working with companies such as Nightworks Studio and creative people with ideas far beyond my own is really exciting. I love trying to push the envelope in these areas. I feel like utilising all natural New Zealand stone types – such as our granites, slates, and marbles, in addition to our limestone – is an opportunity for expansion. And, of course, having the equipment to manufacture these stones is really cool.
