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UK | |
| 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 |
| S Rust collection |
- Upper Llanfihangell-y-Creuddyn
| 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 |
Llechwedd Helyg Mine, Pen-bont Rhydybeddau, Trefeirig, Ceredigion, Wales, UK