French
DeutschTresayes Quarry
| Tresayes Quarry | |
|---|---|
.jpg) | |
  Location in Cornwall | |
| Location | near Roche |
| Nearest city | Truro |
| OS grid | SW 995585 |
| Coordinates | 50°23′32″N 4°49′20″W / 50.39211°N 4.82215°W |
| Area | 1 hectare (2.5 acres) |
| Operated by | Cornwall Wildlife Trust |
| Website | www |
Tresayes Quarry is a nature reserve near Roche in Cornwall. It is also a geological nature reserve of Cornwall Wildlife Trust and is designated as a (non-statutory) County Geology Site.[1] The entrance to the reserve has a small car park with a gate at ///leader.tango.speakers There is a geology trail[2] linking Roche Rock to Tresayes Quarry.
Geology
[edit]The quarry is notable for a granitic pegmatite intruding hornfels, originally a sedimentary rock thermally metamorphosed by the St Austell granite intrusion. The pegmatite is composed of orthoclase feldspar, quartz, mica, and minor tourmaline and cordierite.[3] Associated with the pegmatites, rare elements, such as niobium, cerium and beryllium also occur.[4]
History
[edit]When the quarry was first opened in the late 19th century, it was a source of pure feldspar, which was used in the glass making industry. The site was known locally as the Glass Mine or Polpuff. It closed for several years but reopened in 1917, during the First World War, to provide feldspar for electrical porcelain with at least 50 bal maidens separating the feldspar.[5]
Since 2011 the quarry has been an EarthCache, visited by the geocaching community.[6]
References
[edit]
- ^ "County Geology Sites". Cornwall Wildlife Trust. Retrieved 6 February 2023.
- ^ "Roche Rock and the Tresayes Trail". Retrieved 27 October 2024.
- ^ "Tresayes Quarry (Polpuff Quarry)". mindat.org. Retrieved 29 October 2024.
- ^ "Tresayes". Cornwall Wildlife Trust. Retrieved 8 February 2023.
- ^ Mayers, Lynne (2008). Bal Maidens: Women and Girls of the Cornwall and Devon Mines (2nd ed.). Cinderford: Blaize Bailey Books. pp. 126–129. ISBN 978-0-9556896-1-1. OCLC 663435621.
- ^ "Tresayes Quarry - Roche Glass Mine". Retrieved 7 April 2023.
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