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St Day United Mines (Poldice Mines), St Day, Gwennap, Cornwall, England, UKi
Regional Level Types
St Day United Mines (Poldice Mines)Group of Mines
St Day- not defined -
GwennapCivil Parish
CornwallCounty
EnglandConstituent Country
UKCountry

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Latitude & Longitude (WGS84): 50° 14' 16'' North , 5° 10' 28'' West
Latitude & Longitude (decimal): 50.23785,-5.17470
GeoHash:G#: gbumf1xbs
Locality type:Group of Mines
Köppen climate type:Cfb : Temperate oceanic climate
Nearest Settlements:
PlacePopulationDistance
St. Day700 (2011)0.8km
Chacewater1,226 (2017)2.4km
Redruth42,690 (2017)3.6km
North Country773 (2017)4.6km
Perranwell1,207 (2017)4.7km


The name St Day United Mines was given to Poldice Mine and Carharrack Mine following an amalgamation in 1852.

In 1864, Wheal Unity, Wheal Gorland and Creegbrawse and Penkevil were added to this amalgamation. Subsequently in 1870 the group name was changed to Poldice Mines. Wheal Maid is also stated to have formed part of the group, probably as a result of working in conjunction with Carharrack Mine, which adjoins Wheal Maid's south-western boundary.

The initial name of the amalgamation is based upon the principal village in the area and has no relevance to the parish boundaries, hence most of the mines are located in Gwennap parish, except for Wheal Gorland (in St Day parish) and Creegbrawse and Penkevil Mine (in Chacewater parish).

Since the amalgamation between 1852-93 the outputs given under St Day United or Poldice Mines are: 22,900 tons of 6% copper ore, 3280 tons of black tin, 124 tons of mispickel (arsenic ore) and 49 tons of fluorspar.

Not to be mistaken for the Gwennap United Mines.

From a mineral location perspective, unless no other information is available, specimens should be assigned to the individual mines rather than the group designation.

Edited by Dale Foster
Delete this entry - duplicate page.

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

Mineral list contains entries from the region specified including sub-localities

21 valid minerals.

Detailed Mineral List:

Anatase
Formula: TiO2
Arsenopyrite
Formula: FeAsS
'Bitumen'
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
Brookite
Formula: TiO2
Cassiterite
Formula: SnO2
Chalcopyrite
Formula: CuFeS2
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.
'Chlorite Group'
Copper
Formula: Cu
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
Erythrite
Formula: Co3(AsO4)2 · 8H2O
Reference: Dale Foster Collection
Fluorite
Formula: CaF2
Galena
Formula: PbS
Reference: Hogg, T. (1825): A Manual of Mineralogy. Polyblank Publishers (London), p. 13; Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
Gypsum
Formula: CaSO4 · 2H2O
Molybdenite
Formula: MoS2
Reference: G.Curtis collection.
Phenakite
Formula: Be2SiO4
Reference: Russell, A. (1911) On the occurrence of phenacite in Cornwall. Mineralogical Magazine, vol. 16, n° 73, 55-62.; Russell, A. (1920) On the occurrence of phenacite and scheelite at Wheal Cock, St. Just, Cornwall. Mineralogical Magazine, vol. 19, n° 88, 19-22. (referring to Russell, 1911).
Pseudomalachite
Formula: Cu5(PO4)2(OH)4
Reference: Braithwaite, R. S. W., & Ryback, G. (1994). Reichenbachite from Cornwall and Portugal. Mineralogical Magazine, 58(392), 449-454.
Pyrite
Formula: FeS2
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
Quartz
Formula: SiO2
Siderite
Formula: FeCO3
Spangolite
Formula: Cu6Al(SO4)(OH)12Cl · 3H2O
Reference: No reference listed
Sphalerite
Formula: ZnS
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, p. 416.
Sulphur ?
Formula: S8
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
Tetrahedrite
Formula: Cu6[Cu4(Fe,Zn)2]Sb4S13
Reference: [Embrey & Symes, 1987, 50 - "Minerals of Cornwall and Devon"]
Titanite
Formula: CaTi(SiO4)O
Reference: Collection Richard De Nul
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
'Tungstic Ochre'
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.
'Wolframite'
Formula: (Fe2+)WO4 to (Mn2+)WO4

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
Sulphur ?1.CC.05S8
Group 2 - Sulphides and Sulfosalts
Arsenopyrite2.EB.20FeAsS
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Tetrahedrite2.GB.05Cu6[Cu4(Fe,Zn)2]Sb4S13
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Anatase4.DD.05TiO2
Brookite4.DD.10TiO2
Cassiterite4.DB.05SnO2
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Siderite5.AB.05FeCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Gypsum7.CD.40CaSO4 · 2H2O
Spangolite7.DD.15Cu6Al(SO4)(OH)12Cl · 3H2O
Group 8 - Phosphates, Arsenates and Vanadates
Erythrite8.CE.40Co3(AsO4)2 · 8H2O
Pseudomalachite8.BD.05Cu5(PO4)2(OH)4
Group 9 - Silicates
Phenakite9.AA.05Be2SiO4
Titanite9.AG.15CaTi(SiO4)O
Unclassified Minerals, Rocks, etc.
'Bitumen'-
'Chlorite Group'-
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z
'Tungstic Ochre'-
'Wolframite'-(Fe2+)WO4 to (Mn2+)WO4

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Copper1.1.1.3Cu
Semi-metals and non-metals
Sulphur ?1.3.5.1S8
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
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 3 - SULFOSALTS
3 <ø < 4
Tetrahedrite3.3.6.1Cu6[Cu4(Fe,Zn)2]Sb4S13
Group 4 - SIMPLE OXIDES
AX2
Anatase4.4.4.1TiO2
Brookite4.4.5.1TiO2
Cassiterite4.4.1.5SnO2
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Siderite14.1.1.3FeCO3
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
Group 31 - HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)m(XO4)pZq·xH2O, where m:p > 6:1
Spangolite31.1.5.1Cu6Al(SO4)(OH)12Cl · 3H2O
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
A3(XO4)2·xH2O
Erythrite40.3.6.3Co3(AsO4)2 · 8H2O
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)5(XO4)2Zq
Pseudomalachite41.4.3.1Cu5(PO4)2(OH)4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [4] coordination
Phenakite51.1.1.1Be2SiO4
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Bitumen'-
'Chlorite Group'-
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z
'Tungstic Ochre'-
'Wolframite'-(Fe2+)WO4 to (Mn2+)WO4

List of minerals for each chemical element

HHydrogen
H SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
H GypsumCaSO4 · 2H2O
H PseudomalachiteCu5(PO4)2(OH)4
H ErythriteCo3(AsO4)2 · 8H2O
BeBeryllium
Be PhenakiteBe2SiO4
BBoron
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
CCarbon
C SideriteFeCO3
OOxygen
O CassiteriteSnO2
O SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
O Wolframite(Fe2+)WO4 to (Mn2+)WO4
O AnataseTiO2
O QuartzSiO2
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O BrookiteTiO2
O GypsumCaSO4 · 2H2O
O SideriteFeCO3
O TitaniteCaTi(SiO4)O
O PseudomalachiteCu5(PO4)2(OH)4
O ErythriteCo3(AsO4)2 · 8H2O
O PhenakiteBe2SiO4
FFluorine
F FluoriteCaF2
AlAluminium
Al SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
SiSilicon
Si QuartzSiO2
Si TitaniteCaTi(SiO4)O
Si PhenakiteBe2SiO4
PPhosphorus
P PseudomalachiteCu5(PO4)2(OH)4
SSulfur
S ChalcopyriteCuFeS2
S GalenaPbS
S SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
S TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
S MolybdeniteMoS2
S ArsenopyriteFeAsS
S GypsumCaSO4 · 2H2O
S PyriteFeS2
S SphaleriteZnS
S SulphurS8
ClChlorine
Cl SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
CaCalcium
Ca FluoriteCaF2
Ca GypsumCaSO4 · 2H2O
Ca TitaniteCaTi(SiO4)O
TiTitanium
Ti AnataseTiO2
Ti BrookiteTiO2
Ti TitaniteCaTi(SiO4)O
MnManganese
Mn Wolframite(Fe2+)WO4 to (Mn2+)WO4
FeIron
Fe ChalcopyriteCuFeS2
Fe TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
Fe Wolframite(Fe2+)WO4 to (Mn2+)WO4
Fe ArsenopyriteFeAsS
Fe SideriteFeCO3
Fe PyriteFeS2
CoCobalt
Co ErythriteCo3(AsO4)2 · 8H2O
CuCopper
Cu ChalcopyriteCuFeS2
Cu SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
Cu TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
Cu CopperCu
Cu PseudomalachiteCu5(PO4)2(OH)4
ZnZinc
Zn TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
Zn SphaleriteZnS
AsArsenic
As ArsenopyriteFeAsS
As ErythriteCo3(AsO4)2 · 8H2O
MoMolybdenum
Mo MolybdeniteMoS2
SnTin
Sn CassiteriteSnO2
SbAntimony
Sb TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
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)
Russell, A. (1911) On the occurrence of phenacite in Cornwall. Mineralogical Magazine, vol. 16, n° 73, 55-62.
Russell, A. (1920) On the occurrence of phenacite and scheelite at Wheal Cock, St. Just, Cornwall. Mineralogical Magazine, vol. 19, n° 88, 19-22. (referring to Russell, 1911).
Dines, H.G. (1956) The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, p. 417.

Localities in this Region
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