Ancient tin mine near Bosworlas hamlet, located in the upper Cot valley. There are no remains of this mine, except for some shallow grassed-over spoil heaps in the marshy area along the brook.

The mine may have commenced as an alluvial working but shafts were sunk presumably to a lode beneath the alluvium. There are no records of output.

Ref.:
- Dines, H.G. (1956): The Metalliferous Mining Region of South-West England, Vol. 1, BGS Publishing.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

ⓘ Cassiterite

1 valid mineral.

Detailed Mineral List:

ⓘ Cassiterite

Formula: SnO₂

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Cassiterite	4.DB.05	SnO₂

List of minerals for each chemical element

O	Oxygen
O	ⓘ Cassiterite	SnO₂
Sn	Tin
Sn	ⓘ Cassiterite	SnO₂

Geochronology

Geologic Time

Rocks, Minerals and Events

ⓘ Major polymetallic mineralization

~270 Ma

Cornwall, England, UK

Cisuralian

ⓘ Porphyry dikes intruded (latest age)	~275 Ma	Cornwall, England, UK
ⓘ Greisenization (latest age)	~280 Ma	Cornwall, England, UK
ⓘ Porphyry dikes intruded (earliest age)	~280 Ma	Cornwall, England, UK
ⓘ Formation of metallized pegmatites	~285 Ma	Cornwall, England, UK
ⓘ Greisenization (earliest age)	~285 Ma	Cornwall, England, UK
ⓘ Emplacement of major plutons	~295 Ma	Cornwall, England, UK

Other Regions, Features and Areas containing this locality

British and Irish IslesGroup of Islands

Eurasian PlateTectonic Plate

Rheno-Hercynian BeltOrogenic Belt

England
- Cornwall
  - St Just Mining DistrictMining District
  - ⭔St Just Mining RegionRegion
- Devon and Cornwall metalliferous mining districtMining District

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.

Quick NavTop Mineral List Geochronology Other Regions

Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: October 22, 2026 04:59:57 Page updated: July 31, 2025 12:56:08

Go to top of page

Bosworlas Mine, Cot Valley, St Just, Cornwall, England, UKiRegional Level TypesBosworlas MineMine Cot ValleyValley St JustCivil Parish CornwallCounty EnglandConstituent Country UKCountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }