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New Terras Mine (Terras Mine), St Stephen, St Stephen-in-Brannel, Cornwall, England, UKi
Regional Level Types
New Terras Mine (Terras Mine)Mine
St StephenAdministrative Community
St Stephen-in-BrannelCivil Parish
CornwallCounty
EnglandConstituent Country
UKCountry

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Latitude & Longitude (WGS84):
50° 20' 14'' North , 4° 54' 19'' West
Latitude & Longitude (decimal):
50.33750,-4.90528
GRN:
N34W03
UK National Grid Reference:
SW934527
Type:
Mine
Köppen climate type:
Cfb : Temperate oceanic climate
Nearest Settlements:
PlacePopulationDistance
Saint Stephen2,252(2015)0.9km
Grampound537(2017)4.3km
Nanpean2,563(2017)4.3km
Saint Dennis2,206(2016)5.3km
Probus1,906(2017)6.1km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
British Micromount Society, Devon and Cornwall Branch MeetingsLiskeard, Cornwall34km
Mindat Locality ID:
240909
Long-form identifier:
mindat:1:2:240909:5
GUID (UUID V4):
0


A small tin mine in an elvan dyke, which was first worked from 1870 until 1873 and reworked under the name New Terras Mine between 1884 and 1890. The workings consist of an open cut southeast of the road leading from St Stephen to Terras farm and a shaft in the fields northwest of it, which is believed to have been sunk in search of the elvan. The grid reference marks the open cut which is now heavily overgrown.

The mine sold 90 tons of tin concentrate between 1870 and 1873 and raised another 41 tons of black tin between 1884 and 1890. Several iron and copper arsenates have been reported from the greenstones that host the elvan.

Select Mineral List Type

StandardDetailedGalleryStrunzChemical Elements

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘCassiterite4.DB.05SnO2
Group 8 - Phosphates, Arsenates and Vanadates
ⓘOlivenite8.BB.30Cu2(AsO4)(OH)
ⓘScorodite8.CD.10Fe3+AsO4 · 2H2O
ⓘPharmacosiderite8.DK.10KFe3+4(AsO4)3(OH)4 · 6-7H2O

List of minerals for each chemical element

HHydrogen
HⓘOliveniteCu2(AsO4)(OH)
HⓘPharmacosideriteKFe43+(AsO4)3(OH)4 · 6-7H2O
HⓘScoroditeFe3+AsO4 · 2H2O
OOxygen
OⓘCassiteriteSnO2
OⓘOliveniteCu2(AsO4)(OH)
OⓘPharmacosideriteKFe43+(AsO4)3(OH)4 · 6-7H2O
OⓘScoroditeFe3+AsO4 · 2H2O
KPotassium
KⓘPharmacosideriteKFe43+(AsO4)3(OH)4 · 6-7H2O
FeIron
FeⓘPharmacosideriteKFe43+(AsO4)3(OH)4 · 6-7H2O
FeⓘScoroditeFe3+AsO4 · 2H2O
CuCopper
CuⓘOliveniteCu2(AsO4)(OH)
AsArsenic
AsⓘOliveniteCu2(AsO4)(OH)
AsⓘPharmacosideriteKFe43+(AsO4)3(OH)4 · 6-7H2O
AsⓘScoroditeFe3+AsO4 · 2H2O
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

Other Regions, Features and Areas containing this locality

British and Irish IslesGroup of Islands
Eurasian PlateTectonic Plate
EuropeContinent
UK

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, pleaseregister so you can add to our database. This locality information is for reference purposes only. You should never attempt tovisit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holdersfor access and that you are aware of all safety precautions necessary.

References

Collins, J. H. (1876) Note on the occurrence of Scorodite, Pharmacosiderite and Olivenite in Greenstone at Terras Mine, St. Stephens.Mineralogical Magazine and Journal of the Mineralogical Society, 1 (1). 16-17doi:10.1180/minmag.1876.001.1.07
Dines, H. G. (1956)Memoirs of the Geological Survey (1st ed.) Vol. 2 - The Metalliferous Mining Region of South-West England. Geological Survey of Great Britain, London.
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