Based in Tamahere and only two minutes south of Hamilton our 150 acre property is the largest and the newest quarry in the region.
Waikato Aggregates was formed as a company three years ago when the existing company (Riverlea Sands) was rebranded and we've been busy! Working with and supplying a large range of customers including all the main concrete plants, turf markets and garden centres, our products are transported throughout New Zealand. We also provide the raw materials for roading projects including being a supplier to Transit NZ for major roading projects.
We've invested heavily to ensure that our land, machinery and systems are sustainable for the consented life span of the quarry.
The Waikato region has been built upon a basement of greywacke rocks, which can be seen in the form of many of the hills surrounding the Waikato basin. To the east, the land has been covered with ignimbrite deposits from the Taupo Volcanic Zone. Large amounts of pumice from the Taupo Volcanic Zone have been deposited throughout the Waikato Basin and the Hauraki Plains.
Over the last 2 million years, pyroclastic flows from the Taupo Volcanic Zone have deposited ignimbrites over the area East of Te Kuiti. Some of the largest deposits are from the Whakamaru eruption, north of Taupo, around 330,000 years ago. The ignimbrite deposits from the Oruanui eruption 26,500 years ago, and the Taupo eruption, 1800 years ago are also major deposits.
The Hauraki Plains and Hauraki Gulf are believed to represent a rift valley. The rift valley is assumed to have developed about two million years ago, due to the clockwise rotation of the Eastern North Island, that stretched the land between Auckland and East Cape. The Waikato River used to flow from the southern end of Lake Karapiro, through the Hinuera Gap, and Hauraki Plains, to come out on the east coast in the Hauraki Gulf. The sediment from the 26.5 ka Oruanui eruption of Lake Taupo caused the river to change direction, and come out to the west. In fact, the Waikato River changes its route quite regularly, as eruptions occur in the Taupo Volcanic Zone, and the river channel becomes blocked. Many lakes and swamps in the Waikato Basin represent old routes.
This Pumice and sand from the Taupo Volcanic Zone has been deposited throughout the Waikato Basin and these fan shaped deposits are referred to as the Hinuera Formation. This has created the deposits that are currently being harvested by Waikato Aggregates.