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Tywarnhayle Mine (Wheal Rock), Porthtowan, St Agnes, Cornwall, England, UK

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Latitude & Longitude (WGS84): 50° 16' 48'' North , 5° 13' 48'' West
Latitude & Longitude (decimal): 50.28012,-5.23010
GeoHash:G#: gbuq0cpwc
UK National Grid Reference:SW699473
Locality type:Mine
Köppen climate type:Cfb : Temperate oceanic climate


Note:
Not to be confused with West Wheal Kitty, which also was formerly worked under the name Wheal Rock. The latter mine, not Tywarnhayle Mine, is the type locality of stannite.

The engine house dominates the skyline on top of the steep spoil heaps that tumble down to the Redruth Road though on reaching the spot it is quite clear the house is built on a small remnant of exposed rock. The building has been preserved and is a fabulous example of the Cornish engine house. Several other ruined buildings and chimneys are clustered at the inland end of the hillside.

Mineral samples are plentiful within the dumps, mostly pyrite or chalcopyrite in quartz with other minerals occurring infrequently. (Aug. 2016)

Regions containing this locality

Devon and Cornwall metalliferous mining district, England, UK

District - 752 mineral species & varietal names listed

St Agnes Mining District, Cornwall, England, UK

Mining District - 190 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

10 valid minerals.

Detailed Mineral List:

Anatase
Formula: TiO2
Reference: Martin Stolworthy
Cassiterite
Formula: SnO2
Reference: George Curtis collection
Chalcopyrite
Formula: CuFeS2
Reference: Smyth, W.M., Reeks, T., and Rudler, F.W. (1864): A Catalogue of the Mineral Collections in the Museum of Practical Geology. HMSO Publications (London), 190 pp.
'Chlorite Group'
Reference: Paul De Bondt collection
Goethite
Formula: α-Fe3+O(OH)
Reference: Martin Stolworthy collection
'Limonite'
Formula: (Fe,O,OH,H2O)
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Chris Popham Collection
Pyrite
Formula: FeS2
Quartz
Formula: SiO2
Reference: Martin Stolworthy
Siderite
Formula: FeCO3
Reference: Chris Popham Collection
Sphalerite
Formula: ZnS
Reference: Chris Popham Collection
Tenorite
Formula: CuO

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
'Chalcopyrite'2.CB.10aCuFeS2
'Pyrite'2.EB.05aFeS2
'Sphalerite'2.CB.05aZnS
Group 4 - Oxides and Hydroxides
'Anatase'4.DD.05TiO2
'Cassiterite'4.DB.05SnO2
'Goethite'4.00.α-Fe3+O(OH)
'Quartz'4.DA.05SiO2
'Tenorite'4.AB.10CuO
Group 5 - Nitrates and Carbonates
'Malachite'5.BA.10Cu2(CO3)(OH)2
'Siderite'5.AB.05FeCO3
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
AX
Tenorite4.2.3.1CuO
AX2
Anatase4.4.4.1TiO2
Cassiterite4.4.1.5SnO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Siderite14.1.1.3FeCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Limonite'-(Fe,O,OH,H2O)

List of minerals for each chemical element

HHydrogen
H Goethiteα-Fe3+O(OH)
H Limonite(Fe,O,OH,H2O)
H MalachiteCu2(CO3)(OH)2
CCarbon
C MalachiteCu2(CO3)(OH)2
C SideriteFeCO3
OOxygen
O AnataseTiO2
O CassiteriteSnO2
O Goethiteα-Fe3+O(OH)
O Limonite(Fe,O,OH,H2O)
O MalachiteCu2(CO3)(OH)2
O QuartzSiO2
O SideriteFeCO3
O TenoriteCuO
SiSilicon
Si QuartzSiO2
SSulfur
S ChalcopyriteCuFeS2
S PyriteFeS2
S SphaleriteZnS
TiTitanium
Ti AnataseTiO2
FeIron
Fe ChalcopyriteCuFeS2
Fe Goethiteα-Fe3+O(OH)
Fe Limonite(Fe,O,OH,H2O)
Fe PyriteFeS2
Fe SideriteFeCO3
CuCopper
Cu ChalcopyriteCuFeS2
Cu MalachiteCu2(CO3)(OH)2
Cu TenoriteCuO
ZnZinc
Zn SphaleriteZnS
SnTin
Sn CassiteriteSnO2

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

Localities in this Region
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