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Magnet Mine, Thames, Thames-Coromandel District, Waikato Region, North Island, New Zealand

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Latitude & Longitude (WGS84): 37° 7' 9'' South , 175° 33' 16'' East
Latitude & Longitude (decimal): -37.11934,175.55471
GeoHash:G#: rckuffeh1
Köppen climate type:Cfb : Temperate oceanic climate


Historic gold mine.

Located near the head of Waiotahi Stream.

Epithermal veins in pyrophyllite-diaspore-dickite-kaolinite. Gold is associated with enargite, a copper arsenic sulphosalt.Free gold is occasionally seen. Within the hard white quartz is dark finely granular bands of sulphides. Vein fillings consist of high Au-Ag valued clays, the clay seam follows the Hanging Wall 150 feet or more. The reef is lenticular with a high percentage of sulphides and enargite as isolated grains, and 'beautiful' crystalline aggregates. Gold is frequently associated with the enargite in the clay seam, but no gold is associated with enargite in the quartz vein. Pyrite frequently recements crushed and disjointed veinstone. Barite coats quartz and sulphides in cavities.

The Magnet Gold Mining Company was found extending the low level tunnel in 1907, now a total of 1220 feet. Crushings were sent to the Waiotahi battery. To raise more capital the company was reconstructed in 1910 to the New Magnet Gold Mining Company. In 1912, operations ceased due to the low grades of ore not meeting expenses.


Mineral List


12 valid minerals.

Rock Types Recorded

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Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Miocene
5.333 - 23.03 Ma



ID: 1308094
Coromandel Group Miocene andesite and basaltic andesite lava

Age: Miocene (5.333 - 23.03 Ma)

Stratigraphic Name: Coromandel Group

Description: Andesite and basaltic andesite lava, tuff and tuff breccia, agglomerate and pyroclastic flow deposits; andesite, diorite and dacite dikes and subvolcanic intusions.

Comments: Zealandia Megasequence Extrusive and Intrusive Rocks (Neogene)

Lithology: Andesite, tuffite, tuff-breccia, agglomerate, pyroclastic material, andesite, diorite, dacite

Reference: Edbrooke, S.W., Heron, D.W., Forsyth, P.J., Jongens, R. (compilers). Geology Map of New Zealand 1:1 000 000. GNS Science Geological Map 2. [12]

Tortonian - Burdigalian
7.246 - 20.44 Ma



ID: 1315860
Kuaotunu Subgroup andesite and dacite (Coromandel Group) of Coromandel Volcanic Zone

Age: Miocene (7.246 - 20.44 Ma)

Stratigraphic Name: Kuaotunu Subgroup

Description: Basaltic andesite, andesite and dacite intrusives, flows, volcaniclastites and volcanic epiclastites.

Comments: Neogene igneous rocks. Age based on K-Ar

Lithology: Major:: {andesite},Minor:: {dacite}

Reference: Heron, D.W. . Geology Map of New Zealand 1:250 000. GNS Science Geological Map 1. [13]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Auckland Star newspaper (1907) Magnet G.M. Company, Vol. XXXVIII, issue 228, 24 September 1907.
New Zealand Herald newspaper (1910) Magnet, Vol. XLVII, issue 14423, 16 July 1910.
Fraser, C. (1910) The Geology of the Thames Subdivision, Hauraki, Auckland. New Zealand Geological Survey, Bulletin No. 10 (New Series), New Zealand Government, Wellington, 136 pages.
New Zealand Herald newspaper (1912) New Magnet, Vol. XLIX, issue 14922, 21 February 1912.
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.
Simpson, M.P., Mauk, J.L., Merchant, R.J. (2011) Bonanza-grade epithermal veins from the Coromandel and Thames districts, Hauraki goldfield. AusIMM New Zealand Branch Annual Conference 2011, Queenstown, New Zealand.

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