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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 DistrictDistrict
Waikato RegionRegion
New ZealandCountry

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Key
Latitude & Longitude (WGS84):
37° 14' 46'' South , 175° 49' 5'' East
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Whangamata4,253 (2011)6.7km
Waihi4,619 (2011)15.3km
Paeroa3,994 (2011)18.9km
Waihi Beach2,014 (2011)19.9km
Tairua1,588 (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 Dana Chemical Elements

Mineral 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 Diagram

Detailed 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.
'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.
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.
'K Feldspar'
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: '
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'
Formula: (Fe,O,OH,H2O)
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
'Electrum'1.AA.05(Au,Ag)
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
'Electrum'-(Au,Ag)
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Limonite'-(Fe,O,OH,H2O)

List of minerals for each chemical element

HHydrogen
H Limonite(Fe,O,OH,H2O)
OOxygen
O QuartzSiO2
O Limonite(Fe,O,OH,H2O)
O K Feldspar (var: Adularia)KAlSi3O8
AlAluminium
Al K Feldspar (var: Adularia)KAlSi3O8
SiSilicon
Si QuartzSiO2
Si K Feldspar (var: Adularia)KAlSi3O8
SSulfur
S PyriteFeS2
KPotassium
K K Feldspar (var: Adularia)KAlSi3O8
FeIron
Fe Limonite(Fe,O,OH,H2O)
Fe PyriteFeS2
AgSilver
Ag Electrum(Au,Ag)
AuGold
Au GoldAu
Au 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


Other Regions, Features and Areas containing this locality

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