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Ventonwyn Mine, Great Dowgas Mine (St Stephen Tin and Copper Mines), Downderry, St Stephen-in-Brannel, Cornwall, England, UKi
Regional Level Types
Ventonwyn MineMine
Great Dowgas Mine (St Stephen Tin and Copper Mines)Mine
Downderry- not defined -
St Stephen-in-BrannelCivil Parish
CornwallCounty
EnglandConstituent Country
UKCountry

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Key
Latitude & Longitude (WGS84):
50° 19' 4'' North , 4° 51' 48'' West
Latitude & Longitude (decimal):
UK National Grid Reference:
SW962504
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Grampound537 (2017)3.3km
Saint Stephen2,252 (2015)4.0km
Nanpean2,563 (2017)5.7km
St Austell25,447 (2017)6.9km
Probus1,906 (2017)7.0km


A tin mine, which worked on the western extensions of the Great Hewas lodes. It was worked at a small scale for many years and was eventually amalgamated with Great Dowgas Mine. The grid reference marks the ruin of the engine house, which stands in the middle of a field near Ventonwyn farm.

Between 1889 and 1909, the mine produced 167 tons of black tin. Most of this ore was raised after 1903, when it was part of Great Dowgas Mine.

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


2 valid minerals.

Detailed Mineral List:

Cassiterite
Formula: SnO2
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 2, p. 545
'Chlorite Group'
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 2, p. 545
Quartz
Formula: SiO2
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 2, p. 545

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Cassiterite4.DB.05SnO2
Quartz4.DA.05SiO2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
AX2
Cassiterite4.4.1.5SnO2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-

List of minerals for each chemical element

OOxygen
O CassiteriteSnO2
O QuartzSiO2
SiSilicon
Si QuartzSiO2
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

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 2, p. 545 (also see addenda in the 1994 reprint).

Other Regions, Features and Areas containing this locality

British IslesGroup of Islands
Eurasian PlateTectonic Plate
EuropeContinent
UK

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