Auckland Mine (Mananu; Wentworth), Whangamata, Thames-Coromandel District, Waikato Region, New Zealandi
| Regional Level Types | |
|---|---|
| Auckland Mine (Mananu; Wentworth) | - not defined - |
| Whangamata | - not defined - |
| Thames-Coromandel District | District |
| Waikato Region | Region |
| New Zealand | Country |
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Latitude & Longitude (WGS84):
37° 14' 46'' South , 175° 49' 5'' East
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Whangamata | 4,253 (2011) | 6.7km |
| Waihi | 4,619 (2011) | 15.3km |
| Paeroa | 3,994 (2011) | 18.9km |
| Waihi Beach | 2,014 (2011) | 19.9km |
| Tairua | 1,588 (2011) | 25.7km |
Historic gold mine.
The mine is located in the upper Wentworth Valley, and can be accessed from the end of the Wentworth Valley Road. The walk includes an impressive waterfall, and a couple of adits next to the track. At the road end is a campground, once the site of the settlement supporting the gold mine.
The mine was worked from 1897 to 1908. Initial development was by the Hauraki Peninsula Exploration Company Limited based in London. With low grade ore found, it spun off the Mananu Gold Mining Company in 1899, to further develop the property. In 1900, a 10 stamp battery and cyanide plant was erected, extended by another 10 stamps in 1901. The mine closed shortly after, re-opened again 1903-1905, then with no capital left was sold to Henry Hopper Adams. He formed the Auckland Gold Mining Company who operated the mine until 1908.
The initial period produced 1002 tonnes of ore for 1369 ounces of gold.
From 1900-1904, the Mananu company produced 7099 tonnes of ore for 9895 ounces of gold; 1905-1908 the Auckland company produced 2774 tonnes of ore for 5992 ounces of gold.
The country rock is altered andesite, with some rhyolite to the north-west and south-east of the old workings. The main reef trends north-east, dipping 70 degrees east. The deposit was accessed by four adits. The upper parts of the reef were richest with gold values decreasing with depth. These near surface parts contained friable oxidised finely crystallised quartz, with some banded curly structures. The veins diminished at depth, being replaced by clay and silicified country rock. The wall rock is coarse textured spotty bluish grey chloritized andesite, with pyrite increasing with depth, found in joint planes. The gold found at the site was fine, and only occasionally visible.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
3 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ 'Chlorite Group' Reference: Bell, J.M., Fraser, C. (1912) The geology of the Waihi-Tairua Subdivision, Hauraki Division. New Zealand Geological Survey, Bulletin No. 15, New Zealand Government, Wellington, 192 pages. |
| ⓘ Gold Formula: Au Reference: Bell, J.M., Fraser, C. (1912) The geology of the Waihi-Tairua Subdivision, Hauraki Division. New Zealand Geological Survey, Bulletin No. 15, New Zealand Government, Wellington, 192 pages. |
| ⓘ Gold var. Electrum Formula: (Au,Ag) Reference: Christie, A.B., Mauk, J.L., Simpson, M.P., Brathwaite, R.L., Simmons, S.F. (2007) Epithermal Au-Ag and Related Deposits of the Hauraki Goldfield, Coromandel Volcanic Zone, New Zealand. Economic Geology, 102:5, 785-816.
|
| ⓘ 'K Feldspar' Formula: KAlSi3O8 Reference: Christie, A.B., Mauk, J.L., Simpson, M.P., Brathwaite, R.L., Simmons, S.F. (2007) Epithermal Au-Ag and Related Deposits of the Hauraki Goldfield, Coromandel Volcanic Zone, New Zealand. Economic Geology, 102:5, 785-816.
|
| ⓘ 'K Feldspar var. Adularia' Formula: KAlSi3O8 Reference: Christie, A.B., Mauk, J.L., Simpson, M.P., Brathwaite, R.L., Simmons, S.F. (2007) Epithermal Au-Ag and Related Deposits of the Hauraki Goldfield, Coromandel Volcanic Zone, New Zealand. Economic Geology, 102:5, 785-816.
|
| ⓘ 'Limonite' Reference: Bell, J.M., Fraser, C. (1912) The geology of the Waihi-Tairua Subdivision, Hauraki Division. New Zealand Geological Survey, Bulletin No. 15, New Zealand Government, Wellington, 192 pages. |
| ⓘ Pyrite Formula: FeS2 Reference: Bell, J.M., Fraser, C. (1912) The geology of the Waihi-Tairua Subdivision, Hauraki Division. New Zealand Geological Survey, Bulletin No. 15, New Zealand Government, Wellington, 192 pages. |
| ⓘ Quartz Formula: SiO2 Reference: Bell, J.M., Fraser, C. (1912) The geology of the Waihi-Tairua Subdivision, Hauraki Division. New Zealand Geological Survey, Bulletin No. 15, New Zealand Government, Wellington, 192 pages. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| ⓘ | var. Electrum | 1.AA.05 | (Au,Ag) |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Unclassified Minerals, Rocks, etc. | |||
| ⓘ | 'Chlorite Group' | - | |
| ⓘ | 'K Feldspar' | - | KAlSi3O8 |
| ⓘ | 'var. Adularia' | - | KAlSi3O8 |
| ⓘ | 'Limonite' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| O | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| O | ⓘ K Feldspar | KAlSi3O8 |
| Al | Aluminium | |
| Al | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| Al | ⓘ K Feldspar | KAlSi3O8 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| Si | ⓘ K Feldspar | KAlSi3O8 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| K | Potassium | |
| K | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| K | ⓘ K Feldspar | KAlSi3O8 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Ag | Silver | |
| Ag | ⓘ Gold var. Electrum | (Au,Ag) |
| Au | Gold | |
| Au | ⓘ Gold | Au |
| Au | ⓘ Gold var. Electrum | (Au,Ag) |
References
Sort by
Year (asc) Year (desc) Author (A-Z) Author (Z-A)Bell, J.M., Fraser, C. (1912) The geology of the Waihi-Tairua Subdivision, Hauraki Division. New Zealand Geological Survey, Bulletin No. 15, New Zealand Government, Wellington, 192 pages.
Christie, A.B., Mauk, J.L., Simpson, M.P., Brathwaite, R.L., Simmons, S.F. (2007) Epithermal Au-Ag and Related Deposits of the Hauraki Goldfield, Coromandel Volcanic Zone, New Zealand. Economic Geology, 102:5, 785-816.
External Links
http://www.doc.govt.nz/parks-and-recreation/places-to-go/coromandel/places/coromandel-forest-park/things-to-do/wentworth-valley-walks/
http://www.doc.govt.nz/parks-and-recreation/places-to-go/coromandel/coromandel-forest-park/things-to-do/campsites/wentworth-valley-campground/
http://www.ohinemurinz.org.nz/tracks/chooks-tracks/82-lower-wentworth-valley-mines
http://www.doc.govt.nz/parks-and-recreation/places-to-go/coromandel/coromandel-forest-park/things-to-do/campsites/wentworth-valley-campground/
http://www.ohinemurinz.org.nz/tracks/chooks-tracks/82-lower-wentworth-valley-mines
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