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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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Key
Latitude & Longitude (WGS84):
50° 13' 20'' North , 5° 17' 14'' West
Latitude & Longitude (decimal):
UK National Grid Reference:
SW653411
Locality type:
Group of Shafts (Abandoned) - last checked 2019
Köppen climate type:
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


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 Dana 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
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
Andalusite var:
Formula: Al2(SiO4)O
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
Arsenic
Formula: As
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
Arsenopyrite
Formula: FeAsS
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
'Axinite Group'
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
Cassiterite
Formula: SnO2
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
Chalcopyrite
Formula: CuFeS2
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
'Chlorite Group'
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
Fluorite
Formula: CaF2
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
Hematite
Formula: Fe2O3
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
'Hornblende'
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
Pyrite
Formula: FeS2
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
Pyrrhotite
Formula: Fe1-xS
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
Quartz
Formula: SiO2
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
Scheelite
Formula: Ca(WO4)
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
Sphalerite
Formula: ZnS
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
Stannite
Formula: Cu2FeSnS4
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
'Tourmaline'
Formula: A(D3)G6(Si6O18)(BO3)3X3Z
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.
'Wolframite'
Formula: (Fe2+)WO4 to (Mn2+)WO4
Reference: Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 282-284.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Arsenic1.CA.05As
Group 2 - Sulphides and Sulfosalts
Arsenopyrite2.EB.20FeAsS
Chalcopyrite2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe1-xS
Sphalerite2.CB.05aZnS
Stannite2.CB.15aCu2FeSnS4
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Cassiterite4.DB.05SnO2
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Scheelite7.GA.05Ca(WO4)
Group 9 - Silicates
Andalusite9.AF.10Al2(SiO4)O
var: Chiastolite9.AF.10Al2(SiO4)O
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Unclassified Minerals, Rocks, etc.
'Axinite Group'-
'Chlorite Group'-
'Garnet Group'-X3Z2(SiO4)3
'Hornblende'-
'Tourmaline'-A(D3)G6(Si6O18)(BO3)3X3Z
'Wolframite'-(Fe2+)WO4to (Mn2+)WO4

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Semi-metals and non-metals
Arsenic1.3.1.1As
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Pyrrhotite2.8.10.1Fe1-xS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
Stannite2.9.2.1Cu2FeSnS4
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
AX2
Cassiterite4.4.1.5SnO2
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Scheelite48.1.2.1Ca(WO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Andalusite52.2.2b.1Al2(SiO4)O
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Augite65.1.3a.3(CaxMgyFez)(Mgy1Fez1)Si2O6
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
Andalusite
var: Chiastolite
-Al2(SiO4)O
'Axinite Group'-
'Chlorite Group'-
'Garnet Group'-X3Z2(SiO4)3
'Hornblende'-
'Tourmaline'-A(D3)G6(Si6O18)(BO3)3X3Z
'Wolframite'-(Fe2+)WO4 to (Mn2+)WO4

List of minerals for each chemical element

BBoron
B TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
OOxygen
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O CassiteriteSnO2
O QuartzSiO2
O TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
O HematiteFe2O3
O Andalusite (var: Chiastolite)Al2(SiO4)O
O AndalusiteAl2(SiO4)O
O Wolframite(Fe2+)WO4 to (Mn2+)WO4
O ScheeliteCa(WO4)
O Garnet GroupX3Z2(SiO4)3
FFluorine
F FluoriteCaF2
MgMagnesium
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
AlAluminium
Al Andalusite (var: Chiastolite)Al2(SiO4)O
Al AndalusiteAl2(SiO4)O
SiSilicon
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si QuartzSiO2
Si TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
Si Andalusite (var: Chiastolite)Al2(SiO4)O
Si AndalusiteAl2(SiO4)O
Si Garnet GroupX3Z2(SiO4)3
SSulfur
S PyrrhotiteFe1-xS
S SphaleriteZnS
S ChalcopyriteCuFeS2
S ArsenopyriteFeAsS
S PyriteFeS2
S StanniteCu2FeSnS4
CaCalcium
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca FluoriteCaF2
Ca ScheeliteCa(WO4)
MnManganese
Mn Wolframite(Fe2+)WO4 to (Mn2+)WO4
FeIron
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe PyrrhotiteFe1-xS
Fe ChalcopyriteCuFeS2
Fe ArsenopyriteFeAsS
Fe PyriteFeS2
Fe HematiteFe2O3
Fe Wolframite(Fe2+)WO4 to (Mn2+)WO4
Fe StanniteCu2FeSnS4
CuCopper
Cu ChalcopyriteCuFeS2
Cu StanniteCu2FeSnS4
ZnZinc
Zn SphaleriteZnS
AsArsenic
As ArsenopyriteFeAsS
As ArsenicAs
SnTin
Sn CassiteriteSnO2
Sn StanniteCu2FeSnS4
WTungsten
W Wolframite(Fe2+)WO4 to (Mn2+)WO4
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

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. 1, pp. 282-284.

Other Regions, Features and Areas containing this locality

British 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.
 
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