Useful sources of information on metal mines in Wales:
- Natural Resources Wales
- The Coal Authority
- AditNow
- Welsh Mines Preservation Trust
- Welsh Mines Society
- Royal Commission on the Ancient and Historical Monuments of Wales
- Coflein - the online catalogue of archaeology, buildings, industrial and maritime heritage in Wales
- The National Association of Mining History Organisations
- Dyfed Archaeological Trust
- Clwyd-Powys Archaeological Trust
- Gwynedd Archaeological Trust
- Cadw
- Moore Books
- John Mason - Conservation & Environment
- International Mine Waters Association
- Ceredigion Archive - Abandoned Mine Plans
Cwm Rheidol
- John Mason - prevention of an environmental disaster at Cwm Rheidol Mine in early 1990s
- BBC article on Cwm Rheidol Mine, May 2018
- Power & Water - mine water treatment case study
Frongoch
- ITV news item on Frongoch Mine, April 2015
- Welsh projects tackle mine water - ENDS Mineral Planning article