New Roskear Shaft, Dolcoath Mine, Camborne, Cornwall, England, UKi
| Regional Level Types | |
|---|---|
| New Roskear Shaft | Group of Shafts (Abandoned) |
| Dolcoath Mine | Mine (Abandoned) |
| Camborne | Civil Parish |
| Cornwall | County |
| England | Constituent Country |
| UK | Country |
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Latitude & Longitude (WGS84):
50° 13' 20'' North , 5° 17' 14'' West
Latitude & Longitude (decimal):
UK National Grid Reference:
SW653411
Type:
Group of Shafts (Abandoned) - last checked 2019
KΓΆppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Camborne | 22,500 (2012) | 1.3km |
| Four Lanes | 1,416 (2017) | 4.1km |
| Portreath | 963 (2017) | 4.2km |
| Redruth | 42,690 (2017) | 4.6km |
| North Country | 773 (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 ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
14 valid minerals.
Detailed Mineral List:
| β Andalusite Formula: Al2(SiO4)O |
| β Andalusite var. Chiastolite Formula: Al2(SiO4)O |
| β Arsenic Formula: As |
| β Arsenopyrite Formula: FeAsS |
| β Augite Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| β 'Axinite Group' |
| β Cassiterite Formula: SnO2 |
| β Chalcopyrite Formula: CuFeS2 |
| β 'Chlorite Group' |
| β Fluorite Formula: CaF2 |
| β 'Garnet Group' Formula: X3Z2(SiO4)3 |
| β Hematite Formula: Fe2O3 |
| β 'Hornblende Root Name Group' Formula: ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2 |
| β Pyrite Formula: FeS2 |
| β Pyrrhotite Formula: Fe1-xS |
| β Quartz Formula: SiO2 |
| β Scheelite Formula: Ca(WO4) |
| β Sphalerite Formula: ZnS |
| β Stannite Formula: Cu2FeSnS4 |
| β 'Tourmaline' Formula: AD3G6 (T6O18)(BO3)3X3Z |
| β 'Wolframite Group' |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| β | Arsenic | 1.CA.05 | As |
| Group 2 - Sulphides and Sulfosalts | |||
| β | Sphalerite | 2.CB.05a | ZnS |
| β | Chalcopyrite | 2.CB.10a | CuFeS2 |
| β | Stannite | 2.CB.15a | Cu2FeSnS4 |
| β | Pyrrhotite | 2.CC.10 | Fe1-xS |
| β | Pyrite | 2.EB.05a | FeS2 |
| β | Arsenopyrite | 2.EB.20 | FeAsS |
| Group 3 - Halides | |||
| β | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| β | Hematite | 4.CB.05 | Fe2O3 |
| β | Quartz | 4.DA.05 | SiO2 |
| β | Cassiterite | 4.DB.05 | SnO2 |
| β | 'Wolframite Group' | 4.DB.30 va | |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| β | Scheelite | 7.GA.05 | Ca(WO4) |
| Group 9 - Silicates | |||
| β | Andalusite var. Chiastolite | 9.AF.10 | Al2(SiO4)O |
| β | 9.AF.10 | Al2(SiO4)O | |
| β | Augite | 9.DA.15 | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Unclassified | |||
| β | 'Chlorite Group' | - | |
| β | 'Tourmaline' | - | AD3G6 (T6O18)(BO3)3X3Z |
| β | 'Hornblende Root Name Group' | - | β»Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2 |
| β | 'Garnet Group' | - | X3Z2(SiO4)3 |
| β | 'Axinite Group' | - | |
List of minerals for each chemical element
Geochronology
| Geologic Time | Rocks, Minerals and Events | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Phanerozoic | ||||||||||||||||||||||
| Paleozoic | ||||||||||||||||||||||
| Permian | ||||||||||||||||||||||
| Guadalupian |
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| Cisuralian |
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Other Regions, Features and Areas containing this locality
British and Irish IslesGroup of Islands
Eurasian PlateTectonic Plate
EuropeContinent
UK
- England
- Cornwall
- Camborne-Redruth and St Day Mining DistrictMining District
- Devon and Cornwall metalliferous mining districtMining District
- Cornwall
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References
