|Latitude & Longitude (WGS84):||37° 7' 23'' South , 175° 35' 25'' East|
|Latitude & Longitude (decimal):||-37.12324,175.59046|
|Köppen climate type:||Cfb : Temperate oceanic climate|
Sinter deposits consisting of opaline silica, with associated pyrite-marcasite-arsenopyrite, cinnabar, rare stibnite and chalcopyrite. The sinter deposits are interbedded with sporadic mineralisation in variable propylitised and argillic altered andesite. Freedman in 1985 and 1990 assayed the material at Hg up to 2.64%, Au up to 0.08 ppm, and As up to 440 ppm, with no silver or antimony detected.
(Fraser, 1910) states occurs in a band dipping 10 degrees south-east, one to ten inches wide containing a few lenses of cinnabar at the intersections of irregularly inclined clay filled fractures, up to 25% mercury, but the quantity is small.
(Thames Star newspaper, 1898) notes at least 8 lodes on the south-west side of the Otanui Stream area, a small tributary off the Mangakirikiri Stream. One quartz lode is described trending north-south, dipping 40-48 degrees east, 3-4 feet wide. Little information is given on the quality or quantity of the mineral found.
The cinnabar deposits were discovered by the Lowrie brothers and Long (surnames) in 1897. Two drives, and surface pottering is noted shortly after. The Thames Quicksilver Mines Limited is formed in 1899 to prospect the deposits, then nothing more is heard of this entity. It is widely reported an American syndicate plans to take over the deposits in 1906, but this also comes to nought.
The Mangakirikiri cinnabar claim is registered with the warden in 1915, to prospect the specimen cinnabar, and 'good general dirt', and this also dis-appears from history no sooner as it is formed.
The area is not easily accessible.
8 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
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
0 - 2.588 Ma
|Cenozoic volcanic rocks|
Age: Pleistocene (0 - 2.588 Ma)
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. 
5.333 - 23.03 Ma
|Coromandel Group Miocene andesite and basaltic andesite lava|
Age: Miocene (5.333 - 23.03 Ma)
Stratigraphic Name: Coromandel Group
Comments: Zealandia Megasequence Extrusive and Intrusive Rocks (Neogene)
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. 
|Tortonian - Burdigalian|
7.246 - 20.44 Ma
|Kuaotunu Subgroup andesite and dacite (Coromandel Group) of Coromandel Volcanic Zone|
Age: Miocene (7.246 - 20.44 Ma)
Stratigraphic Name: Kuaotunu Subgroup
Reference: Heron, D.W. . Geology Map of New Zealand 1:250 000. GNS Science Geological Map 1.