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Stenna Gwyn Mine (Stennagwyn Mine), Foxhole, St Stephen-in-Brannel, St Austell District, Cornwall, England, UK

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Latitude & Longitude (WGS84): 50° 21' 41'' North , 4° 51' 56'' West
Latitude & Longitude (decimal): 50.36139,-4.86556
UK National Grid Reference:SW962553
Other regions containing this locality:Devon and Cornwall metalliferous mining district, England, UK
Köppen climate type:Cfb : Temperate oceanic climate


An ancient underground mine which ceased work shortly after 1804. An attempt may have been made to re-open it in 1880 when a return of 1 ton of black tin is recorded. Online court records show a dispute over unpaid bills for this period.

Stennagwyn is referred to under a number of different spellings including Stannagwyn and Stenna Gwinn which was used repeatedly by William Gregor in his correspondence regarding his research on Wavellite and Fluellite.
When working, Stennagwyn had china clay works immediately to the north and south. North of the mine, the works eventually became the West of England China Clay Works which has been cleared and the site is now occupied by the currently active Goverseth Plant. Immediately to the south was the North Carloggas China Clay works. The china clay works in the close vicinity of Stennagwyn were amongst the first to supply materials to the fledgling potteries in Stoke on Trent.

In the early 1980's there were at least two remaining chimneys from Stennagwyn Mine together with the foundations of a building. The chimney immediately behind the terrace of cottages had the base of a small building nearby. Unfortunately, since then, the area has been levelled to provide a football pitch, clubhouse, day center for young children and a static caravan park. Everything behind the terrace has either been flattened or pushed into a single heap. The one remaining collapsed chimney is the only feature listed by Herring & Smith (1991). Even the name Stennagwyn has been removed from some modern maps although the farmhouse immediately to the south of the mine site still keeps the name.

With so much happening in this relatively small area, it is impossible to find any original features in situ. The 24-inch map of 1908 shows extensive dumps that are now all lost.

Beer (1988) reports that the mine was worked from two shafts, adit level and a large openwork. None of this can be found today. One of the pipes going under the railway may take water from an adit? Industrial archaeological features can be viewed from the railway line. The locals have forced a footpath across the site, including the seldom used railway track, to link Goonamaris with the convenience store in Foxhole.

Carpholite supposedly collected here in 1952 by Arthur Kingsbury (1906-68) is now considered unlikely. This is one of a number of likely or definitely falsified Kingsbury localities.


Mineral List


17 valid minerals. 1 (TL) - type locality of valid minerals. 2 erroneous literature entries.

Rock Types Recorded

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Select Rock List Type

Alphabetical List Tree Diagram

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

Permian - Carboniferous
252.17 - 358.9 Ma



ID: 2027014
Unnamed Igneous Intrusion, Carboniferous To Permian

Age: Paleozoic (252.17 - 358.9 Ma)

Lithology: Felsic-rock

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]

Early Devonian
393.3 - 419.2 Ma



ID: 3151591
Early Devonian sandstone

Age: Early Devonian (393.3 - 419.2 Ma)

Lithology: Sandstone

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



This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Dines, H.G. (1956) The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 2, p. 543.
Kingsbury, A.W.G. and Hartley, J. (1957) Carpholite from Cumberland and Cornwall. Mineralogical Magazine, vol. 31, n° 237, 502.
Beer, K.E. (1988) Addenda and Corrigenda to 'The metalliferous mining region of south-west England'. HMSO Publications (London), xx pp.
Herring, P. and Smith, J.R. (1991) The Archaeology of the St Austell China Clay Area. Cornwall Archaeological Unit (Truro), xx pp.
Ryback, G., Hart, A.D., and Stanley, C.J. (2001) Journal of the Russell Society 7(2), xxx-xxx.

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