Silver Valley Mine (William and Mary Worth Mine; incl. Ashburton Mine), Sevenstones, Calstock, Cornwall, England, UKi
| Regional Level Types | |
|---|---|
| Silver Valley Mine (William and Mary Worth Mine; incl. Ashburton Mine) | Mine (Abandoned) |
| Sevenstones | Hamlet |
| Calstock | Civil Parish |
| Cornwall | County |
| England | Constituent Country |
| UK | Country |
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Latitude & Longitude (WGS84):
50° 30' 28'' North , 4° 16' 45'' West
Latitude & Longitude (decimal):
UK National Grid Reference:
SX384702
Type:
Mine (Abandoned) - last checked 2019
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Callington | 5,786 (2017) | 2.5km |
| Gunnislake | 4,044 (2017) | 5.0km |
| Calstock | 790 (2017) | 5.3km |
| Bere Alston | 2,164 (2018) | 6.9km |
| Landrake | 1,115 (2017) | 9.5km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| British Micromount Society, Devon and Cornwall Branch Meetings | Liskeard, Cornwall | 14km |
An old silver and lead mine in a small valley on the southeast slope of Kit Hill, which was started in 1815 and worked until 1855. It was earlier known as William and Mary Worth Mine and was worked for some time together with Wheal Brothers. The sett extended on both sides of the valley, but the workings were mostly located on its eastern side (in Calstock parish). The workings on its western side were also known as Ashburton Mine. The grid reference marks the approximate location of the shaft.
The lode was said to be an extension of the Wheal Brothers lode, but its position is not known. A record of development works undertaken on the property in 1852 describes the lode as being 4 ft wide at the 14-fathom level, with a 6 inch (15 cm) leader of argentiferous ore yielding 200 ounces of silver per ton.
In 1912 and 1918, the property was prospected for tin and tungsten, but interest was focussed on another lode, called Goodluck Lode (possibly a westward extension of Goodluck Lode of Harrowbarrow Mine). It was composed of iron-rich chlorite with bands of quartz and contained traces of cassiterite, scattered spots of sulfides and bunches of bladed wolframite crystals to 1 inch in length. In 1943, when tungsten was in demand, the mine was reopened. The adit was cleared and extended and a crosscut driven from its western end that connected to Goodluck Lode. These workings were mainly on the west side of the valley (in Callington parish). Near the eastern end of the adit, wolframite was found occupying a 15 cm wide vein. Rich ores, however, were very unevenly distributed and the average values were below one percent for both tin and tungsten. The project was abandoned without having raised any ores.
The only recorded output of Silver Valley Mine is for 9 tons of 77% lead ore in 1852.
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
10 valid minerals.
Detailed Mineral List:
| ⓘ Arsenopyrite Formula: FeAsS |
| ⓘ Cassiterite Formula: SnO2 |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Chamosite Formula: (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 |
| ⓘ Chamosite var. Daphnite Formula: (Fe,Mg)5Al(Si,Al)4O10(OH)8 |
| ⓘ Chlorargyrite Formula: AgCl References: |
| ⓘ 'Chlorite Group' |
| ⓘ Galena Formula: PbS |
| ⓘ Native Silver Formula: Ag |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Sphalerite Formula: ZnS |
| ⓘ 'Wolframite Group' |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Silver | 1.AA.05 | Ag |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| Group 3 - Halides | |||
| ⓘ | Chlorargyrite | 3.AA.15 | AgCl |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | Cassiterite | 4.DB.05 | SnO2 |
| ⓘ | 'Wolframite Group' | 4.DB.30 va | |
| Group 9 - Silicates | |||
| ⓘ | Chamosite | 9.EC.55 | (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 |
| ⓘ | var. Daphnite | 9.EC.55 | (Fe,Mg)5Al(Si,Al)4O10(OH)8 |
| Unclassified | |||
| ⓘ | 'Chlorite Group' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Chamosite | (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 |
| H | ⓘ Chamosite var. Daphnite | (Fe,Mg)5Al(Si,Al)4O10(OH)8 |
| O | Oxygen | |
| O | ⓘ Cassiterite | SnO2 |
| O | ⓘ Chamosite | (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 |
| O | ⓘ Chamosite var. Daphnite | (Fe,Mg)5Al(Si,Al)4O10(OH)8 |
| O | ⓘ Quartz | SiO2 |
| Mg | Magnesium | |
| Mg | ⓘ Chamosite | (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 |
| Mg | ⓘ Chamosite var. Daphnite | (Fe,Mg)5Al(Si,Al)4O10(OH)8 |
| Al | Aluminium | |
| Al | ⓘ Chamosite | (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 |
| Al | ⓘ Chamosite var. Daphnite | (Fe,Mg)5Al(Si,Al)4O10(OH)8 |
| Si | Silicon | |
| Si | ⓘ Chamosite | (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 |
| Si | ⓘ Chamosite var. Daphnite | (Fe,Mg)5Al(Si,Al)4O10(OH)8 |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| Cl | Chlorine | |
| Cl | ⓘ Chlorargyrite | AgCl |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Chamosite | (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8 |
| Fe | ⓘ Chamosite var. Daphnite | (Fe,Mg)5Al(Si,Al)4O10(OH)8 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
| Ag | Silver | |
| Ag | ⓘ Chlorargyrite | AgCl |
| Ag | ⓘ Native Silver | Ag |
| Sn | Tin | |
| Sn | ⓘ Cassiterite | SnO2 |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
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
- Rheno-Hercynian BeltOrogenic Belt
EuropeContinent
UK
- England
- Callington and Tavistock Mining DistrictMining District
- Devon and Cornwall metalliferous mining districtMining District
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