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Buchan's Lode, Bannockburn, Cromwell, Central Otago District, Otago Region, South Island, New Zealand

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Latitude & Longitude (WGS84): 45° 6' 37'' South , 169° 5' 2'' East
Latitude & Longitude (decimal): -45.11055,169.08389
Köppen climate type:Cfb : Temperate oceanic climate

Three subparallel, stibnite-mineralised zones strike northwest and dip steeply northeast at Buchans prospect, west of Carricktown. Stibnite-rich zones range from a few centimetres up to 1.2 m wide, and contain hydrothermal breccia with a cement of fine-grained quartz and medium-coarse-grained (up to 3 cm) stibnite. Surficial oxidation has produced abundant white, cream, and orange Sb oxide phases, as well as goethite. Breccia clasts are largely altered host schist, with the latter adjacent to the lodes being extensively fractured and locally silicified. Hydrothermal quartz cement strongly resembles the fine-grained quartz in the high-angle gold-bearing breccia lodes described above. Stibnite veins display local postmineralisation shearing, resulting in polished surfaces.

Mineral List

11 valid minerals.

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

201.3 - 252.17 Ma

ID: 1310831
Caples Group TZIII schist

Age: Triassic (201.3 - 252.17 Ma)

Stratigraphic Name: Caples Group

Description: Schistose (TZIII) volcaniclastic sandstone, siltstone, mudstone and conglomerate with included volcanics and limestone; minor quartzite, metachert and serpentinite.

Comments: Eastern Province (Caples Terrane) Rocks

Lithology: Limestone, quartzite, chert, serpentinite

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]

Triassic - Permian
201.3 - 298.9 Ma

ID: 3189657
Paleozoic-Mesozoic crystalline metamorphic rocks

Age: Phanerozoic (201.3 - 298.9 Ma)

Stratigraphic Name: Haast Schist

Comments: Caples Terrane

Lithology: Metawacke; greenschist/almandine amphibolite grade metasedimentary/metavolcanic schist

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]

Norian - Kungurian
208.5 - 279.3 Ma

ID: 1339377
Undifferentiated Caples Terrane TZIII schist

Age: Phanerozoic (208.5 - 279.3 Ma)

Stratigraphic Name: Caples Group

Description: Well foliated psammitic and pelitic schist with incipient segregration; minor greenschist and metachert; qtz veins common; TZIII.

Comments: Basement (Eastern Province) metamorphic rocks. Age based on stratigraphic correlation, K-Ar dating

Lithology: Major:: {schist},Minor:: {psammite, pelite, metachert, greenschist}

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

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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Ashley, P.M., Craw, D. (1995) Carrick Range Au and Sb mineralisation in Caples Terrane, Otago Schist, Central Otago, New Zealand. New Zealand Journal of Geology and Geophysics, 38:2, 137-149.

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