|Latitude & Longitude (WGS84):||37° 9' 35'' South , 175° 43' 46'' East|
|Latitude & Longitude (decimal):||-37.15985,175.72946|
|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.
2 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. 
|Messinian - Tortonian|
5.333 - 11.62 Ma
|Waiwawa Subgroup andesite and dacite (Coromandel Group) of Coromandel Volcanic Zone|
Age: Miocene (5.333 - 11.62 Ma)
Stratigraphic Name: Waiwawa Subgroup
Reference: Heron, D.W. . Geology Map of New Zealand 1:250 000. GNS Science Geological Map 1. 
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.