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Trevaunance Mine (Wheal Trevaunance), St Agnes Consols (Polberro Consols), St Agnes, Cornwall, England, UKi
Regional Level Types
Trevaunance Mine (Wheal Trevaunance)Mine
St Agnes Consols (Polberro Consols)Mine
St AgnesCivil Parish
CornwallCounty
EnglandConstituent Country
UKCountry

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Latitude & Longitude (WGS84): 50° 18' 52'' North , 5° 12' 54'' West
Latitude & Longitude (decimal): 50.31448,-5.21501
GeoHash:G#: gbuq1r6x1
UK National Grid Reference:SW712510
Locality type:Mine
Köppen climate type:Cfb : Temperate oceanic climate
Nearest Settlements:
PlacePopulationDistance
Saint Agnes2,820 (2014)0.8km
Mount Hawke1,511 (2017)3.6km
Perranporth3,210 (2017)5.3km
North Country773 (2017)7.4km
Chacewater1,226 (2017)7.6km


Although Trevaunance Mine was a fairly significant mine in the St Agnes Area, surprisingly little detail of its history is written down.

J.H. Collins made the following comment in his Observations on the West of England Mining Region, published in 1912:

"Trevaunance, Wheal, St Agnes. Worked at one time with the Goonlaze Mine as Trevaunance Consols and at another as Trevaunance United. A very ancient and profitable mine said to have given £100,000 in dividends. In 1864 Trevaunance was 60 fathoms deep (to adit) and employed twelve people, but very little has been done below that level. In 1870 employed thirty people. In 1843-4, sold 1158 tons of copper ore for £3625 (Trevaunance Consols); 1861-83 sold 550 tons of black tin (Wheal Trevaunance); 188-7 sold 510 tons of black tin."

The stack of the pumping engine still remains as a prominent feature of the site, with the truncated base of the enclosed beam winding engine being visible a short distance to the east of the stack.

These features lie within private land but can be viewed from the adjacent public highway.

A significant pit, possibly a former open work, lies to the northern side of Trevaunance Road, opposite the aforementioned stack and engine house base.

Considerable dumps are located in this pit, although much is now covered by heavy undergrowth.

Samples of Cassiterite can be collected from these dumps with diligence.

The occurrence of much of the Cassiterite is as crystals on joint planes in metamorphosed killas, generally suggestive of a stockwork type of structure.

The entire pit area is designated as open access (right to roam) land and contains several paths in various states of order from easily passable to heavily grown in.

Historically the Trevaunance Mine has been renowned for producing specimens of Fluorite displaying a tetrahexahedron crystal habit, often referred to as a 'four-faced cube'.

Fluorite can still be found on the dumps, but generally only as massive material nowadays.

Good crystalline Topaz specimens can also be found with careful searching.

Regions containing this locality

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

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


11 valid minerals.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Tennantite2.GB.05Cu6[Cu4(Fe,Zn)2]As4S13
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Cassiterite4.DB.05SnO2
var: Wood Tin4.DB.05SnO2
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Siderite5.AB.05FeCO3
Group 9 - Silicates
Topaz9.AF.35Al2(SiO4)(F,OH)2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z
'Wolframite'-(Fe2+)WO4 to (Mn2+)WO4

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 3 - SULFOSALTS
3 <ø < 4
Tennantite3.3.6.2Cu6[Cu4(Fe,Zn)2]As4S13
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
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 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Topaz52.3.1.1Al2(SiO4)(F,OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
Cassiterite
var: Wood Tin
-SnO2
'Chlorite Group'-
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z
'Wolframite'-(Fe2+)WO4 to (Mn2+)WO4

List of minerals for each chemical element

HHydrogen
H Goethiteα-Fe3+O(OH)
H TopazAl2(SiO4)(F,OH)2
BBoron
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
CCarbon
C SideriteFeCO3
OOxygen
O CassiteriteSnO2
O QuartzSiO2
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O HematiteFe2O3
O Goethiteα-Fe3+O(OH)
O SideriteFeCO3
O Cassiterite (var: Wood Tin)SnO2
O TopazAl2(SiO4)(F,OH)2
O Wolframite(Fe2+)WO4 to (Mn2+)WO4
FFluorine
F FluoriteCaF2
F TopazAl2(SiO4)(F,OH)2
AlAluminium
Al TopazAl2(SiO4)(F,OH)2
SiSilicon
Si QuartzSiO2
Si TopazAl2(SiO4)(F,OH)2
SSulfur
S SphaleriteZnS
S TennantiteCu6[Cu4(Fe,Zn)2]As4S13
S ChalcopyriteCuFeS2
S PyriteFeS2
CaCalcium
Ca FluoriteCaF2
MnManganese
Mn Wolframite(Fe2+)WO4 to (Mn2+)WO4
FeIron
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
Fe HematiteFe2O3
Fe Goethiteα-Fe3+O(OH)
Fe SideriteFeCO3
Fe Wolframite(Fe2+)WO4 to (Mn2+)WO4
CuCopper
Cu TennantiteCu6[Cu4(Fe,Zn)2]As4S13
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SphaleriteZnS
AsArsenic
As TennantiteCu6[Cu4(Fe,Zn)2]As4S13
SnTin
Sn CassiteriteSnO2
Sn Cassiterite (var: Wood Tin)SnO2
WTungsten
W Wolframite(Fe2+)WO4 to (Mn2+)WO4

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

Neogene
2.588 - 23.03 Ma



ID: 2032835
Neogene Rocks (Undifferentiated)

Age: Neogene (2.588 - 23.03 Ma)

Lithology: Gravel, sand, silt and clay

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

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]

Devonian
358.9 - 419.2 Ma



ID: 3135951
Devonian claystone

Age: Devonian (358.9 - 419.2 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]

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)
Rocks & Minerals (xxxx) 16, 129.
Collins, J.H. (1912) Observations on the West of England Mining Region: Being an Account of the Mineral Deposits and Economic Geology of the Region, and Forming Vol. XIV of the Transactions of the Royal Geological Society of Cornwall.

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