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Wheal Unity Wood (Tolgullow United Mine; West Poldice Mine), Chacewater, Cornwall, England, UK

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Latitude & Longitude (WGS84): 50° 14' 53'' North , 5° 10' 48'' West
Latitude & Longitude (decimal): 50.24806,-5.18000
UK National Grid Reference:SW733436
Other regions containing this locality:Devon and Cornwall metalliferous mining district, England, UK
Köppen climate type:Cfb : Temperate oceanic climate

Unity Wood Mine extends over a strike length of approximately 1 km extending in an east-north-easterly direction from Zimapan in the west through the southern section of the woods known as Unity Wood to its eastern limit in the vicinity of a farm known as St Neot.

The most visible remains of the mine are two engine houses in the vicinity of Magors Shaft. These comprise a large pumping engine house that pumped from Magors Shaft and a smaller rotative engine house that appeared to have done multiple duty of stamping and winding. Unusually, this engine house is not in an aligment that would have allowed it to easily wind from Magors Shaft, but instead it is believed to have wound from a shaft some way to the south-west of it.

A significant dump is still to be found to the south-west of Magors pumping engine house that will yield specimens with diligent searching. An accessable dump of Harpers Shaft lies approximately 100 metres to the north-east of Magors Shaft.

The section of the mine that lies within the woodland itself has several shafts, the majority of these are now choked with others having been made safe.

There are also exensive ancient surface workings marking the courses of lodes on the site. Whilst collecting in here is challenging, applying diligence and patience can yield some extremely good specimens.

Mineral List

15 valid minerals.


Geologic TimeRocks, Minerals and Events
ⓘ Major polymetallic mineralization~270 MaCornwall, England, UK
ⓘ Porphyry dikes intruded (latest age)~275 MaCornwall, England, UK
ⓘ Greisenization (latest age)~280 MaCornwall, England, UK
ⓘ Porphyry dikes intruded (earliest age)~280 MaCornwall, England, UK
ⓘ Formation of metallized pegmatites~285 MaCornwall, England, UK
ⓘ Greisenization (earliest age)~285 MaCornwall, England, UK
ⓘ Emplacement of major plutons~295 MaCornwall, England, UK

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

Early Carboniferous
323.2 - 358.9 Ma

ID: 3192903
Paleozoic sedimentary rocks

Age: Mississippian (323.2 - 358.9 Ma)

Lithology: Sedimentary rocks

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]

Late Devonian
358.9 - 382.7 Ma

ID: 3135052
Late Devonian claystone

Age: Late Devonian (358.9 - 382.7 Ma)

Lithology: Claystone

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Middle Devonian
382.7 - 393.3 Ma

ID: 2035678
Middle Devonian (Undifferentiated)

Age: Middle Devonian (382.7 - 393.3 Ma)

Lithology: Mudstone, siltstone and sandstone

Reference: British Geological Survey. DiGMapGB-625. British Geological Survey ©NERC. [23]

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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
- Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 404-405.
- Embrey, P.G., and Symes, R.F. (1987): Minerals of Cornwall and Devon, p. 50.

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