Round Hill pit, Macraes Mine, Macraes (Macraes Flat), Otago Region, New Zealandi
| Regional Level Types | |
|---|---|
| Round Hill pit | Pit |
| Macraes Mine | Mine |
| Macraes (Macraes Flat) | Town |
| Otago Region | Region |
| New Zealand | Country |
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Latitude & Longitude (WGS84):
45° 21' 25'' South , 170° 25' 53'' East
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Ranfurly | 793 (2011) | 35.9km |
| Karitane | 427 (2015) | 36.1km |
| Kakanui | 443 (2013) | 41.4km |
| Warrington | 427 (2011) | 41.7km |
| Naseby | 120 (2013) | 44.4km |
Gold. A shallow pit just north of Frasers pit, and east of the processing plant. Mining commenced in 1990, and was completed in 1998. The pit has been partially back-filled by tailings from the nearby Golden Point Pit. This was partly because the west wall of the pit was in danger of collapse.
The Hyde-Macrae Shear Zone at this point is 100 metres thick, bounded by a Hanging Wall, 10 metres thick, and Footwall shear up to 5 metres thick.
The shears show as dark grey, fine grained micaceous graphitic schist, with local fault altered rocks, particularly near the top of the Hanging Wall shear. Silicification, shearing intensity, brecciacation, and quartz veining are all highly variable. The zone contains a network of anatomising shears up to 15 metres thick, with no set dip or trends. There are zones of sheeted veins, the individual veins within this discontinuous, but with a steep north dip, and striking north-east. The quartz is massive milky white, to finely laminated milky quartz, and dark grey quartz, with rare scheelite.
As of he 31st December 2009, the measured resource is 4.06 Mt of ore at 0.98 g/t Au, indicated resource 20.18 Mt at 0.93 g/t Au, and inferred resource 18.38 Mt at 1.2 g/t Au for 0.12 Moz Au.
The north dipping stockwork veins were the first structures, cross-cut by later concordant shears, and ramp veins at 145 million years old. Locally flat concordant shears formed within the intrashear package at 135 million years ago.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Native Gold Formula: Au |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
List of minerals for each chemical element
| Au | Gold | |
|---|---|---|
| Au | ⓘ Native Gold | Au |
Other Regions, Features and Areas containing this locality
Australian Plate
- Haast SchistAccretionary Complex
New Zealand
- South IslandIsland
- Southern AlpsMountain Range
- ⭔Waitaki DistrictDistrict
Pacific PlateTectonic Plate
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