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Silver Vein Mine (Beacon Hill Mine; Wheal Fortescue), Lostwithiel, Cornwall, England, UK

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Latitude & Longitude (WGS84): 50° 24' 23'' North , 4° 38' 30'' West
Latitude & Longitude (decimal): 50.40639,-4.64167
GeoHash:G#: gbuwy2hn3
UK National Grid Reference:SX123597
Other regions containing this locality:St Austell Mining District, Cornwall, England, UK
Devon and Cornwall metalliferous mining district, England, UK
Locality type:Mine
Köppen climate type:Cfb : Temperate oceanic climate


Wheal Fortescue was first opened in 1855, when at a shallow depth muriate of silver (chlorargyrite) was found. At a depth of ony 3 fathoms the lode split, and the mine stoped in 1857. (Beacon Hill mine, may have been a local name)
In 1860 the mine reopened under the name of Silver Vein, when the mine was developed to a 50 fathom level. There was some small development on an east-west copper lode.
The silver occurred in the north-south lode. Probably in common with other such silver deposits in Cornwall, it may have been at the intersection of the two lodes.
Recorded output is scant:
3.5 tons of lead ore.
40 oz of silver (from lead ore)
61.25 tons of silver ore.



Mineral List


13 valid minerals.

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]

Early Devonian
393.3 - 419.2 Ma



ID: 2033471
Lower Devonian Rocks (Undifferentiated)

Age: Early Devonian (393.3 - 419.2 Ma)

Lithology: Mudstone, siltstone and sandstone

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

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.
 
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