Mangatangi River Rock Limited (100% owned by Hugh Green Group) produces washed, screened and uncrushed river stones from coarse, greywacke-derived river gravel in the Mangatangi Valley at 900 Kaiaua Rd.
The quarry started producing aggregates in June 2006. Mangatangi River Rock Limited is situated in Franklin District between inland Mangatangi and Kaiaua. The quarry is on the Firth of Thames and is approximately 10kms inland from Kaiaua and 20kms east of the start of highway 2 at Bombay.
-OTu7A.jpg)
Un-crushed coarse grey wacke-derived fluviatile gravels with a small proportion of coarser-grained slightly to moderately weathered greywacke sandstone clasts. It has grey-gold tones, reflecting the look of a typical NZ River and is very suitable for the mulching of gardens and other decorative uses such as the creation of natural water features. It is also great drainage, RipRap and Gabion Rock.
All the grades have permeability coefficient of 82ms plus which indicates drainage capabilities greater than crushed rock. The grades over 80mm are ideal for Gabion baskets & Rip/Rap.
| Specification | |
| Weathering Quality | BA |
| Crushing Resistance | 400kN |
| Specific Gravity | 2.621 |
| Meets TNZ Spec For Drainage | |
