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Halcyon Mine (Karaka), Thames, Thames-Coromandel District, Waikato Region, North Island, New Zealand

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Latitude & Longitude (WGS84): 37° 8' 0'' South , 175° 32' 54'' East
Latitude & Longitude (decimal): -37.13356,175.54849
GeoHash:G#: rckuf8n92
Köppen climate type:Cfb : Temperate oceanic climate

Historic gold mine.

100 acres. Located on the south-east side of Karaka Stream. The lowest adit enters from the creek bank.

Originally known as the Karaka Mine from 1891 to 1896, producing 1822 tonnes of ore for 735 ounces of gold. Then the lease was taken over by the Halcyon Gold Mining Company of Auckland covering former leases Halcyon, Ophir, and Manchester. This company erected a battery but when inspected in 1908 the battery had been removed. The Ophir Gold Mining Company operated 1893-1894 producing 93 tonnes of ore.

The country rock is highly propylitised andesite and breccia, with high grade gold where the quartz veins crossed andesite. The quartz veins trend north-east to south-west, or east-west, following the contacts between the andesite and breccia. The quartz veins contain pyrite, chalcopyrite, occasional sphalerite, stibnite and gold. Minor enargite is found. Dark granular pyrite recements disjointed quartz, and also lines cavities, and is found coating the tips of quartz crystals growing within the cavities. Overall the reefs were low grade for gold.

Mineral List

7 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

Late Pleistocene - Middle Pleistocene
0.0117 - 0.781 Ma

ID: 1359568
OIS5+-OIS2 (Middle Pleistocene - Late Pleistocene) river and hill slope deposits

Age: Pleistocene (0.0117 - 0.781 Ma)

Stratigraphic Name: Tauranga Group

Description: Predominantly pumiceous sand, silt, mud and clay, with interbedded gravel and peat.

Comments: Middle Pleistocene - Late Pleistocene river and hill slope deposits. Age based on absolute age calculated from stratigraphic age range

Lithology: Major:: {mud},Minor:: {sand, silt, clay, peat}

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

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]

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

This page contains all mineral locality references listed on 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 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.


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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.

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