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UK | |
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| Day, Harry (1999) BMS Database, British Micromount Society. |
| Day, Harry (1999) BMS Database, British Micromount Society. |
| Braithwaite, R.S.W. (1982): Pyromorphite, wulfenite and other minerals from the Bwlch-Glas mine central Wales. Mineralogical Record 13: 151-153 |
| Day, Harry (1999) BMS Database, British Micromount Society. |
| Rust, S. A., Mason, J. S. (1988) The Minerals of Esgair Hir Mine, Bwlch-y-Esgair Hir, Ceulanymaesmawr, Dyfed, Wales . UK Journal of Mines and Minerals 5, 35-43 |
| Chris Popham Collection |
| Day, Harry (1999) BMS Database, British Micromount Society. |
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| Day, Harry (1999) BMS Database, British Micromount Society. |
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| Day, Harry (1999) BMS Database, British Micromount Society. |
| Chris Popham Collection |
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| Chris Popham Collection |
| Day, Harry (1999) BMS Database, British Micromount Society. |
| Day, Harry (1999) BMS Database, British Micromount Society. |
| Jones, A. D. (1987) The minerals of Llechwedd Helyg. UK Journal of Mines and Minerals 3, 25-27 |
| S.Rust Collection |
- Upper Llanfihangell-y-Creuddyn
| D Vesty collection |
| [Specimen in the Natural History Museum, London] |
| Chris Popham Collection |
| Rust, Steve A. (2019) Minerals of the Frongoch Mine. Published by the author, 180 pages. ISBN 978-1-9162641-0-6. Day, Harry (1999) BMS Database, British Micromount Society. Green, D.I., Rust, S.A., Mason, J.S. (1996) Classic British mineral localities: Frongoch mine, Dyfed. UK Journal of Mines and Minerals 17, Rockbottom Publications. 29-39 Greg, Robert Philips, Lettsom, William G. (1858) Manual of the Mineralogy of Great Britain and Ireland. John Van Voorst, London. |
| Day, Harry (1999) BMS Database, British Micromount Society. |
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| S. Rust collection |
- Lisburne Lead and Silver Mines
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| Mason, J. S., Rust, S. A. (1997) The Mineralogy of Ystrad Einion Mine, Dyfed, Wales. UK Journal of Mines and Minerals 18, 33-36 |
Bwlch Glas Mine, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK