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New Roskear Shaft, Dolcoath Mine, Camborne, Cornwall, England, UKi
Regional Level Types
New Roskear ShaftGroup of Shafts (Abandoned)
Dolcoath MineMine (Abandoned)
CamborneCivil Parish
CornwallCounty
EnglandConstituent Country
UKCountry

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Latitude & Longitude (WGS84):
50° 13' 20'' North , 5° 17' 14'' West
Latitude & Longitude (decimal):
50.22246,-5.28735
GeoHash:
G#: gbujxwtz5
GRN:
N34W03
UK National Grid Reference:
SW653411
Type:
Group of Shafts (Abandoned) - last checked 2019
Köppen climate type:
Cfb : Temperate oceanic climate
Nearest Settlements:
PlacePopulationDistance
Camborne22,500 (2012)1.3km
Four Lanes1,416 (2017)4.1km
Portreath963 (2017)4.2km
Redruth42,690 (2017)4.6km
North Country773 (2017)4.7km
Mindat Locality ID:
194482
Long-form identifier:
mindat:1:2:194482:5
GUID (UUID V4):
1c1adb60-4faf-46e5-9d0a-9456882e2aed


In 1920, when further exploration of the bottom levels of Dolcoath Mine became unprofitable, the mine was abandoned and attention was directed to the Roskear section to the north, which had been acquired by the West Dolcoath Exploration Syndicate around 1898. In 1929, New Roskear shaft was sunk to a depth of 2,000 feet between the North and South Roskear main lodes, in order to explore the ground below the copper ore zone of these mines where rich tin ores were believed to exist.

From the surface, the shaft passed through greenstone (dolerite) and killas. Below 300 feet, a dark massive hornfels was cut, and below 620 feet, more greenstone was encountered which was invaded by small veinlets with weak tin or sulphide mineralization. Below 870 feet, it passed into hornfels again which then continued to full depth. It was only crossed by two narrow aplite veins, a pegmatite vein carrying some garnet, a granite vein and an elvan dyke. Lode fragments encountered at depths above 1,600 feet carried mainly chalcopyrite and sphalerite. Tin-bearing lodes hit below and in crosscuts driven at depths of 1,700 feet, 1,900 feet, and 2,000 feet gave extremely irregular assay values; high grade mineralizations were only met sporadically. After this work was completed, further capital was needed. Though, the lodes opened up were not encouraging enough and the project was abandoned.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

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


Mineral List


14 valid minerals.

Detailed Mineral List:

ⓘ Andalusite
Formula: Al2(SiO4)O
ⓘ Andalusite var. Chiastolite
Formula: Al2(SiO4)O
ⓘ Arsenic
Formula: As
ⓘ Arsenopyrite
Formula: FeAsS
ⓘ Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘ 'Axinite Group'
ⓘ Cassiterite
Formula: SnO2
ⓘ Chalcopyrite
Formula: CuFeS2
ⓘ 'Chlorite Group'
ⓘ Fluorite
Formula: CaF2
ⓘ 'Garnet Group'
Formula: X3Z2(SiO4)3
ⓘ Hematite
Formula: Fe2O3
ⓘ 'Hornblende Root Name Group'
Formula: ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
ⓘ Pyrite
Formula: FeS2
ⓘ Pyrrhotite
Formula: Fe1-xS
ⓘ Quartz
Formula: SiO2
ⓘ Scheelite
Formula: Ca(WO4)
ⓘ Sphalerite
Formula: ZnS
ⓘ Stannite
Formula: Cu2FeSnS4
ⓘ 'Tourmaline'
Formula: AD3G6 (T6O18)(BO3)3X3Z
ⓘ 'Wolframite Group'

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘArsenic1.CA.05As
Group 2 - Sulphides and Sulfosalts
ⓘSphalerite2.CB.05aZnS
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘStannite2.CB.15aCu2FeSnS4
ⓘPyrrhotite2.CC.10Fe1-xS
ⓘPyrite2.EB.05aFeS2
ⓘArsenopyrite2.EB.20FeAsS
Group 3 - Halides
ⓘFluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
ⓘHematite4.CB.05Fe2O3
ⓘQuartz4.DA.05SiO2
ⓘCassiterite4.DB.05SnO2
ⓘ'Wolframite Group'4.DB.30 va
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘScheelite7.GA.05Ca(WO4)
Group 9 - Silicates
ⓘAndalusite
var. Chiastolite		9.AF.10Al2(SiO4)O
ⓘ9.AF.10Al2(SiO4)O
ⓘAugite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Unclassified
ⓘ'Chlorite Group'-
ⓘ'Tourmaline'-AD3G6 (T6O18)(BO3)3X3Z
ⓘ'Hornblende Root Name Group'-◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
ⓘ'Garnet Group'-X3Z2(SiO4)3
ⓘ'Axinite Group'-

List of minerals for each chemical element

HHydrogen
Hⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
BBoron
Bⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
OOxygen
Oⓘ AndalusiteAl2(SiO4)O
Oⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Oⓘ CassiteriteSnO2
Oⓘ Andalusite var. ChiastoliteAl2(SiO4)O
Oⓘ HematiteFe2O3
Oⓘ QuartzSiO2
Oⓘ ScheeliteCa(WO4)
Oⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
Oⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Oⓘ Garnet GroupX3Z2(SiO4)3
FFluorine
Fⓘ FluoriteCaF2
Fⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
MgMagnesium
Mgⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
AlAluminium
Alⓘ AndalusiteAl2(SiO4)O
Alⓘ Andalusite var. ChiastoliteAl2(SiO4)O
Alⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
SiSilicon
Siⓘ AndalusiteAl2(SiO4)O
Siⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Siⓘ Andalusite var. ChiastoliteAl2(SiO4)O
Siⓘ QuartzSiO2
Siⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Siⓘ Garnet GroupX3Z2(SiO4)3
SSulfur
Sⓘ ArsenopyriteFeAsS
Sⓘ ChalcopyriteCuFeS2
Sⓘ PyriteFeS2
Sⓘ PyrrhotiteFe1-xS
Sⓘ SphaleriteZnS
Sⓘ StanniteCu2FeSnS4
ClChlorine
Clⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
CaCalcium
Caⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Caⓘ FluoriteCaF2
Caⓘ ScheeliteCa(WO4)
Caⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
FeIron
Feⓘ ArsenopyriteFeAsS
Feⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Feⓘ ChalcopyriteCuFeS2
Feⓘ HematiteFe2O3
Feⓘ PyriteFeS2
Feⓘ PyrrhotiteFe1-xS
Feⓘ StanniteCu2FeSnS4
CuCopper
Cuⓘ ChalcopyriteCuFeS2
Cuⓘ StanniteCu2FeSnS4
ZnZinc
Znⓘ SphaleriteZnS
AsArsenic
Asⓘ ArsenopyriteFeAsS
Asⓘ ArsenicAs
SnTin
Snⓘ CassiteriteSnO2
Snⓘ StanniteCu2FeSnS4
WTungsten
Wⓘ ScheeliteCa(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

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, 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

Dines, H. G. (1956) The Metalliferous Mining Region of South-West England (1st ed.) Vol. 1. Geological Survey of Great Britain, London.pp.282-284
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