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Trevaunance Mine (Wheal Trevaunance), St Agnes Consols (Polberro Consols), St Agnes, Cornwall, England, UK

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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


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.

Alternative Label Names

This is a list of additional names that have been recorded for mineral labels associated with this locality in the minID database. This may include previous versions of the locality name hierarchy from mindat.org, data entry errors, and it may also include unconfirmed sublocality names or other names that can only be matched to this level.

Trevaunance Mine

Regions containing this locality

Devon and Cornwall metalliferous mining district, England, UK

Mining District - 762 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

Commodity List

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


Mineral List


11 valid minerals.

Detailed Mineral List:

Cassiterite
Formula: SnO2
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Rocks and Minerals 16, 129
Cassiterite var: Wood Tin
Formula: SnO2
Reference: Dale Foster Collection
Chalcopyrite
Formula: CuFeS2
Reference: Paul De Bondt collection
'Chlorite Group'
Reference: No reference listed
'commodity:Copper'
Formula: Cu
Reference:  
Fluorite
Formula: CaF2
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.
Goethite
Formula: α-Fe3+O(OH)
Reference: Dale foster Collection
Hematite
Formula: Fe2O3
Reference: Dale foster Collection
Pyrite
Formula: FeS2
Reference: Dale Foster Collection
Quartz
Formula: SiO2
Reference: No reference listed
Siderite
Formula: FeCO3
Reference: Dale foster Collection
Sphalerite
Formula: ZnS
Reference: No reference listed
Tennantite
Formula: Cu6[Cu4(Fe,Zn)2]As4S13
Reference: Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), pp. 108.
'commodity:Tin'
Formula: Sn
Reference:  
Topaz
Formula: Al2(SiO4)(F,OH)2
Description: Whilst the specimens from this locality may be considered poor for the species in general, for Cornwall they rank as good examples, often well crystallised but small (generally < 5mm)although occasional larger crystals are encountered.
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Rocks and Minerals 16, 129
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Reference: Dale Foster Collection
'Wolframite'
Formula: (Fe2+)WO4 to (Mn2+)WO4
Description: Wolframite not previously noted at Trevaunance Mine. Limited number of specimens found to date, of limited quality but an interesting occurrence.
Reference: Dale Foster Collection

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
'Tennantite'2.GB.05Cu6[Cu4(Fe,Zn)2]As4S13
Group 3 - Halides
'Fluorite'3.AB.25CaF2
Group 4 - Oxides and Hydroxides
'Cassiterite'4.DB.05SnO2
var: Wood Tin4.DB.05SnO2
'Goethite'4.00.α-Fe3+O(OH)
'Hematite'4.CB.05Fe2O3
'Quartz'4.DA.05SiO2
Group 5 - Nitrates and Carbonates
'Siderite'5.AB.05FeCO3
Group 9 - Silicates
'Topaz'9.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, Rocks, 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 Goethiteα-Fe3+O(OH)
O HematiteFe2O3
O QuartzSiO2
O SideriteFeCO3
O TopazAl2(SiO4)(F,OH)2
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O Wolframite(Fe2+)WO4 to (Mn2+)WO4
O Cassiterite (var: Wood Tin)SnO2
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 ChalcopyriteCuFeS2
S PyriteFeS2
S SphaleriteZnS
S TennantiteCu6[Cu4(Fe,Zn)2]As4S13
CaCalcium
Ca FluoriteCaF2
MnManganese
Mn Wolframite(Fe2+)WO4 to (Mn2+)WO4
FeIron
Fe ChalcopyriteCuFeS2
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3
Fe PyriteFeS2
Fe SideriteFeCO3
Fe Wolframite(Fe2+)WO4 to (Mn2+)WO4
CuCopper
Cu ChalcopyriteCuFeS2
Cu TennantiteCu6[Cu4(Fe,Zn)2]As4S13
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.

External Links



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