Polcrebo Downs Mine, Nancegollan, Crowan, Cornwall, England, UKi
| Regional Level Types | |
|---|---|
| Polcrebo Downs Mine | Mine |
| Nancegollan | - not defined - |
| Crowan | Civil Parish |
| Cornwall | County |
| England | Constituent Country |
| UK | Country |
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Latitude & Longitude (WGS84):
50° 9' 2'' North , 5° 17' 39'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Leedstown | 267 (2017) | 4.5km |
| Breage | 471 (2017) | 5.4km |
| Helston | 12,184 (2017) | 5.5km |
| Four Lanes | 1,416 (2017) | 6.9km |
| Camborne | 22,500 (2012) | 7.0km |
Mindat Locality ID:
253518
Long-form identifier:
mindat:1:2:253518:3
GUID (UUID V4):
98386f7e-f13b-4d53-b137-800b35baa557
A small tin mine, located on the western margin of the Carnmenellis Granite and within the Civil Parish of Crowan. The mine is located at around 150 metres above sea level. The chimney stack survives as a prominent landmark overlooking the village of Nancegollan. The engine house, which featured an unusual arched bob wall finally collapsed sometime in the 1960's. Some dumps are still present on the mine.
The mine worked three lodes, these being known as Main Lode, North Tin Lode and South Tin Lode. The mine reached a depth of 100 fathoms prior to being abandoned in around 1890. Production figures appear to be incomplete, but a production of 102 tons of black tin is recorded between 1884 and 1890.
In recent years the dumps have yielded specimens of cassiterite as small crystals and thin veinlets in a granitic matrix and small brown wood tins.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| β Cassiterite Formula: SnO2 |
| β Cassiterite var. Wood Tin Formula: SnO2 References: |
| β Quartz Formula: SiO2 References: |
| β Quartz var. Chalcedony Formula: SiO2 References: |
| β 'Tourmaline' Formula: AD3G6 (T6O18)(BO3)3X3Z References: Dale Foster CollectionIdentified by Dale Foster: Visual Identification |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| β | Quartz | 4.DA.05 | SiO2 |
| β | var. Chalcedony | 4.DA.05 | SiO2 |
| β | Cassiterite | 4.DB.05 | SnO2 |
| β | var. Wood Tin | 4.DB.05 | SnO2 |
| Unclassified | |||
| β | 'Tourmaline' | - | AD3G6 (T6O18)(BO3)3X3Z |
List of minerals for each chemical element
| B | Boron | |
|---|---|---|
| B | β Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
| O | Oxygen | |
| O | β Cassiterite | SnO2 |
| O | β Quartz var. Chalcedony | SiO2 |
| O | β Quartz | SiO2 |
| O | β Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
| O | β Cassiterite var. Wood Tin | SnO2 |
| Si | Silicon | |
| Si | β Quartz var. Chalcedony | SiO2 |
| Si | β Quartz | SiO2 |
| Sn | Tin | |
| Sn | β Cassiterite | SnO2 |
| Sn | β Cassiterite var. Wood Tin | SnO2 |
Geochronology
| Geologic Time | Rocks, Minerals and Events | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Phanerozoic | ||||||||||||||||||||||
| Paleozoic | ||||||||||||||||||||||
| Permian | ||||||||||||||||||||||
| Guadalupian |
| |||||||||||||||||||||
| Cisuralian |
| |||||||||||||||||||||
Other Regions, Features and Areas containing this locality
British and Irish IslesGroup of Islands
Eurasian PlateTectonic Plate
EuropeContinent
UK
- England
- Cornwall
- Mount's Bay Mining DistrictMining District
- Devon and Cornwall metalliferous mining districtMining District
- Cornwall
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References
