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St Day United Mines (Poldice Mines), St Day, Gwennap, Cornwall, England, UK

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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


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

Devon and Cornwall metalliferous mining district, England, UK

Mining District - 760 mineral species & varietal names listed

Camborne-Redruth and St Day Mining District, Cornwall, England, UK

Mining District - 261 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

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

20 valid minerals.

Detailed Mineral List:

Anatase
Formula: TiO2
Arsenopyrite
Formula: FeAsS
Reference: Russell, A. (1911) On the occurrence of phenacite in Cornwall. Mineralogical Magazine, vol. 16, n° 73, 55-62.
'Bitumen'
Brookite
Formula: TiO2
Cassiterite
Formula: SnO2
Chalcopyrite
Formula: CuFeS2
'Chlorite Group'
Reference: Russell, A. (1911) On the occurrence of phenacite in Cornwall. Mineralogical Magazine, vol. 16, n° 73, 55-62.
Copper
Formula: Cu
Erythrite
Formula: Co3(AsO4)2 · 8H2O
Fluorite
Formula: CaF2
Reference: Russell, A. (1911) On the occurrence of phenacite in Cornwall. Mineralogical Magazine, vol. 16, n° 73, 55-62.
Galena
Formula: PbS
Gypsum
Formula: CaSO4 · 2H2O
Molybdenite
Formula: MoS2
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
Quartz
Formula: SiO2
Reference: Russell, A. (1911) On the occurrence of phenacite in Cornwall. Mineralogical Magazine, vol. 16, n° 73, 55-62.
Siderite
Formula: FeCO3
Spangolite
Formula: Cu6Al(SO4)(OH)12Cl · 3H2O
Sphalerite
Formula: ZnS
Tetrahedrite
Formula: Cu6[Cu4(Fe,Zn)2]Sb4S13
Titanite
Formula: CaTi(SiO4)O
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
'Tungstic Ochre'
'Wolframite'
Formula: (Fe2+)WO4 to (Mn2+)WO4
Reference: Russell, A. (1911) On the occurrence of phenacite in Cornwall. Mineralogical Magazine, vol. 16, n° 73, 55-62.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Copper'1.AA.05Cu
Group 2 - Sulphides and Sulfosalts
'Arsenopyrite'2.EB.20FeAsS
'Chalcopyrite'2.CB.10aCuFeS2
'Galena'2.CD.10PbS
'Molybdenite'2.EA.30MoS2
'Pyrite'2.EB.05aFeS2
'Sphalerite'2.CB.05aZnS
'Tetrahedrite'2.GB.05Cu6[Cu4(Fe,Zn)2]Sb4S13
Group 3 - Halides
'Fluorite'3.AB.25CaF2
Group 4 - Oxides and Hydroxides
'Anatase'4.DD.05TiO2
'Brookite'4.DD.10TiO2
'Cassiterite'4.DB.05SnO2
'Quartz'4.DA.05SiO2
Group 5 - Nitrates and Carbonates
'Siderite'5.AB.05FeCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Gypsum'7.CD.40CaSO4 · 2H2O
'Spangolite'7.DD.15Cu6Al(SO4)(OH)12Cl · 3H2O
Group 8 - Phosphates, Arsenates and Vanadates
'Erythrite'8.CE.40Co3(AsO4)2 · 8H2O
'Pseudomalachite'8.BD.05Cu5(PO4)2(OH)4
Group 9 - Silicates
'Phenakite'9.AA.05Be2SiO4
'Titanite'9.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
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, Rocks, 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 ErythriteCo3(AsO4)2 · 8H2O
H GypsumCaSO4 · 2H2O
H PseudomalachiteCu5(PO4)2(OH)4
H SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
BeBeryllium
Be PhenakiteBe2SiO4
BBoron
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
CCarbon
C SideriteFeCO3
OOxygen
O AnataseTiO2
O BrookiteTiO2
O CassiteriteSnO2
O ErythriteCo3(AsO4)2 · 8H2O
O GypsumCaSO4 · 2H2O
O PhenakiteBe2SiO4
O PseudomalachiteCu5(PO4)2(OH)4
O QuartzSiO2
O SideriteFeCO3
O SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
O TitaniteCaTi(SiO4)O
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O Wolframite(Fe2+)WO4 to (Mn2+)WO4
FFluorine
F FluoriteCaF2
AlAluminium
Al SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
SiSilicon
Si PhenakiteBe2SiO4
Si QuartzSiO2
Si TitaniteCaTi(SiO4)O
PPhosphorus
P PseudomalachiteCu5(PO4)2(OH)4
SSulfur
S ArsenopyriteFeAsS
S ChalcopyriteCuFeS2
S GalenaPbS
S GypsumCaSO4 · 2H2O
S MolybdeniteMoS2
S PyriteFeS2
S SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
S SphaleriteZnS
S TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
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 ArsenopyriteFeAsS
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
Fe SideriteFeCO3
Fe TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
Fe Wolframite(Fe2+)WO4 to (Mn2+)WO4
CoCobalt
Co ErythriteCo3(AsO4)2 · 8H2O
CuCopper
Cu ChalcopyriteCuFeS2
Cu CopperCu
Cu PseudomalachiteCu5(PO4)2(OH)4
Cu SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
Cu TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
ZnZinc
Zn SphaleriteZnS
Zn TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
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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