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Tresayes Quarry (Polpuff Quarry), Trezaise (Tresayes), Roche, St Austell District, Cornwall, England, UK

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Latitude & Longitude (WGS84): 50° 23' 45'' North , 4° 49' 27'' West
Latitude & Longitude (decimal): 50.39583,-4.82417
UK National Grid Reference:SW993590
Other regions containing this locality:Devon and Cornwall metalliferous mining district, England, UK
Köppen climate type:Cfb : Temperate oceanic climate


A disused quarry in a pegmatite known for its large feldspar crystals. First opened in the late 1870s, the Mining Journal records that production was hampered by severe winters on this exposed common. Early production was for pure feldspar which was used for making glass and the quarry was known locally as the glass mine. Although worked mainly as a quarry there are reputed to be underground workings.

The quarry was re-opened in 1917, during the First World War, to provide feldspar for electrical porcelain. It closed again shortly afterwards.

Cornwall Wildlife Trust manage the quarry. Until very recently, the dense vegetation combined with very damp conditions made it impossible to access the quarry. The quarry is managed on the remaining part of a 25 year lease from Goonvean China Clay Company.

After studying the exposure, when you return to your car, you will spot low grade ore samples in the unmade road. Only the purest feldspar was used and the rest treated as waste.




Mineral List


2 valid minerals.

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

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Early Carboniferous
323.2 - 358.9 Ma



ID: 3192903
Paleozoic sedimentary rocks

Age: Mississippian (323.2 - 358.9 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Early Devonian
393.3 - 419.2 Ma



ID: 2033471
Lower Devonian Rocks (Undifferentiated)

Age: Early Devonian (393.3 - 419.2 Ma)

Lithology: Mudstone, siltstone and sandstone

Reference: British Geological Survey. DiGMapGB-625. British Geological Survey ©NERC. [23]

Ordovician
443.8 - 485.4 Ma



ID: 3150224
Ordovician granite

Age: Ordovician (443.8 - 485.4 Ma)

Lithology: Granite group

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
- A.K. Hamilton Jenkin: Annotations to Ordnance Survey map, scale 1:10,000, sheet 41NE.

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