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Chelmsford Mine, Neavesville (Nevesville), Thames-Coromandel District, Waikato Region, North Island, New Zealand

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Latitude & Longitude (WGS84): 37° 9' 35'' South , 175° 43' 46'' East
Latitude & Longitude (decimal): -37.15985,175.72946
GeoHash:G#: rckuwg621
Köppen climate type:Cfb : Temperate oceanic climate


Historic gold mine.

Chelmsford is 3 kilometres east of Neavesville. The site has now reverted to scrub and forest.

In 1899, a group of miners and investors formed the Chelmsford syndicate, and developed a mine here. The lease covered 200 acres, containing five reefs. After several crushings the mine, 10 stamp battery, and cyanide plant was sold to the newly formed New Chelmsford Company in 1903. Crushings continued for the next two years.

A total of 4487 tonnes of ore was processed, yielding 3144 ounces of gold-silver. From 1906-1908 the Taihoa Gold Mining Company prospected the lower levels with no success.

The deposit is hosted by altered andesite, with most ore coming from the No. 1 Main Reef, at 2 feet wide. Gold and silver is found in sheeted and brecciated vein material, recemented by chalcedony. Cavities are common, often lined with quartz crystals, much iron oxidised and stained black by manganese oxides.


Mineral List


2 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

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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

Quaternary
0 - 2.588 Ma



ID: 3187411
Cenozoic volcanic rocks

Age: Pleistocene (0 - 2.588 Ma)

Lithology: Ignimbrite(s); felsic volcanic rocks; rhyolite

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. [154]

Messinian - Tortonian
5.333 - 11.62 Ma



ID: 1358754
Waiwawa Subgroup andesite and dacite (Coromandel Group) of Coromandel Volcanic Zone

Age: Miocene (5.333 - 11.62 Ma)

Stratigraphic Name: Waiwawa Subgroup

Description: Andesite, dacite and rhyodacite flows and domes with intercalated tuff, tuff breccia and volcaniclastic sediments. Local, non--welded, dacitic, pumice-rich ignimbrite.

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

Lithology: Major:: {andesite},Minor:: {dacite, rhyodacite, tuff, breccia}

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

Miocene
5.333 - 23.03 Ma



ID: 1311309
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 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 (1899) Chelmsford Syndicate, Vol. XXX, issue 182, 03 August 1899.
Thames Star newspaper (1903) New Chelmsford, Vol. XXXXI, issue 10406, 05 September 1903
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.

 
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