Colchough's Mine (Lucknow company), Bendigo, Central Otago District, Otago Region, South Island, New Zealand
|Latitude & Longitude (WGS84):||44° 55' 52'' South , 169° 21' 32'' East|
|Latitude & Longitude (decimal):||-44.93116,169.35912|
|Köppen climate type:||Cfb : Temperate oceanic climate|
The reef was discovered by Charles Colchough in May 1869, a long time after the goldfield in general was discovered in 1862. The success of the Cromwell Company mine on the Logan Reef, led to a renewed search for auriferous quartz reefs in the area, leading to Colchough's discovery.
The Colchough Quartz Reef Mining Company was formed with 8400 pounds capital spread amongst mainly Dunedin businessmen. The mine opened November 1869, with the first crushing at the Aurora battery finding enough gold to warrant the company purchasing a second hand battery. Subsequent crushings were poor, and the mine/plant was sold in September 1872.
The Lucknow Quartz Reef Mining Company was formed to take over the mine with twelve shareholders. Charles Colchough still held an interest in the new company, however he had little involvement, his time spent at leases he owned in the Carrick Range, as Cromwell auctioneer, mining agent, town clerk, and mayor.
A new tunnel was started, reaching 600 feet long. The battery was overhauled in 1875. Results across this period were still poor, and the mine was let on tribute in 1877 to Charlton and party. They abandoned the mine is 1878, and in 1885 the battery was shifted to Whites Reef in the Old Man Range elsewhere in the district.
The reef strikes east-west, dipping slightly south, 3 feet wide, consisting of quartz one foot wide either side, and mullock in the centre. Within the reef is found quartz, gold, and arsenopyrite. There is a second reef parallel to the main one.
3 valid minerals.
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
0.0117 - 2.588 Ma
|Early Quaternary till deposits|
Age: Pleistocene (0.0117 - 2.588 Ma)
Stratigraphic Name: Pakihi Supergroup
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. 
0.126 - 0.781 Ma
|OIS12 (Middle Pleistocene) glacier deposits|
Age: Pleistocene (0.126 - 0.781 Ma)
Stratigraphic Name: Lindis Formation
Comments: Middle Pleistocene glacier deposits. Age based on C14, U-Th dating
Reference: Heron, D.W. . Geology Map of New Zealand 1:250 000. GNS Science Geological Map 1. 
|Triassic - Permian|
201.3 - 298.9 Ma
|Paleozoic-Mesozoic crystalline metamorphic rocks|
Age: Phanerozoic (201.3 - 298.9 Ma)
Stratigraphic Name: Haast Schist
Comments: Caples Terrane
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.