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Wheal Unity Wood (Tolgullow United Mine; West Poldice Mine), Chacewater, Cornwall, England, UKi
Regional Level Types
Wheal Unity Wood (Tolgullow United Mine; West Poldice Mine)Mine
ChacewaterCivil Parish
CornwallCounty
EnglandConstituent Country
UKCountry

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Latitude & Longitude (WGS84): 50° 14' 53'' North , 5° 10' 48'' West
Latitude & Longitude (decimal): 50.24806,-5.18000
GeoHash:G#: gbumf5kh1
UK National Grid Reference:SW733436
Locality type:Mine
Köppen climate type:Cfb : Temperate oceanic climate
Nearest Settlements:
PlacePopulationDistance
St. Day700 (2011)1.0km
Chacewater1,226 (2017)1.9km
Redruth42,690 (2017)3.6km
North Country773 (2017)4.1km
Mount Hawke1,511 (2017)4.3km


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 alignment 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 accessible 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 extensive 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.

Regions containing this locality

Eurasian PlateTectonic Plate
EuropeContinent
British IslesGroup of Islands
Devon and Cornwall metalliferous mining district, England, UKMining District
Camborne-Redruth and St Day Mining District, Cornwall, England, UKMining District

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


15 valid minerals.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Arsenopyrite2.EB.20FeAsS
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Cassiterite4.DB.05SnO2
Goethite4.00.α-Fe3+O(OH)
Quartz4.DA.05SiO2
Tenorite4.AB.10CuO
Group 5 - Nitrates and Carbonates
Siderite5.AB.05FeCO3
Group 8 - Phosphates, Arsenates and Vanadates
Olivenite8.BB.30Cu2(AsO4)(OH)
Scorodite8.CD.10Fe3+AsO4 · 2H2O
Group 9 - Silicates
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Wolframite'-(Fe2+)WO4 to (Mn2+)WO4

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
AX
Tenorite4.2.3.1CuO
AX2
Cassiterite4.4.1.5SnO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Siderite14.1.1.3FeCO3
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
(AB)5(XO4)2·xH2O
Scorodite40.4.1.3Fe3+AsO4 · 2H2O
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A2(XO4)Zq
Olivenite41.6.6.1Cu2(AsO4)(OH)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
'Wolframite'-(Fe2+)WO4 to (Mn2+)WO4

List of minerals for each chemical element

HHydrogen
H OliveniteCu2(AsO4)(OH)
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H Goethiteα-Fe3+O(OH)
H ScoroditeFe3+AsO4 · 2H2O
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
CCarbon
C SideriteFeCO3
OOxygen
O OliveniteCu2(AsO4)(OH)
O CassiteriteSnO2
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O TenoriteCuO
O QuartzSiO2
O Goethiteα-Fe3+O(OH)
O Wolframite(Fe2+)WO4 to (Mn2+)WO4
O ScoroditeFe3+AsO4 · 2H2O
O SideriteFeCO3
FFluorine
F FluoriteCaF2
NaSodium
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
AlAluminium
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
SiSilicon
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si QuartzSiO2
SSulfur
S ChalcopyriteCuFeS2
S PyriteFeS2
S GalenaPbS
S ArsenopyriteFeAsS
S ChalcociteCu2S
S MolybdeniteMoS2
CaCalcium
Ca FluoriteCaF2
MnManganese
Mn Wolframite(Fe2+)WO4 to (Mn2+)WO4
FeIron
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe ArsenopyriteFeAsS
Fe Goethiteα-Fe3+O(OH)
Fe Wolframite(Fe2+)WO4 to (Mn2+)WO4
Fe ScoroditeFe3+AsO4 · 2H2O
Fe SideriteFeCO3
CuCopper
Cu OliveniteCu2(AsO4)(OH)
Cu ChalcopyriteCuFeS2
Cu TenoriteCuO
Cu ChalcociteCu2S
AsArsenic
As OliveniteCu2(AsO4)(OH)
As ArsenopyriteFeAsS
As ScoroditeFe3+AsO4 · 2H2O
MoMolybdenum
Mo MolybdeniteMoS2
SnTin
Sn CassiteriteSnO2
WTungsten
W Wolframite(Fe2+)WO4 to (Mn2+)WO4
PbLead
Pb GalenaPbS

Geochronology

Geologic TimeRocks, Minerals and Events
Phanerozoic
 Paleozoic
  Permian
   Guadalupian
ⓘ Major polymetallic mineralization~270 MaCornwall, England, UK
   Cisuralian
ⓘ 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 Macrostrat.org

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 Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) 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.

External Links



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