| Name | Location | County | Country | Power source | Type | Function | River |
| Charlotte Elizabeth Mill, Gwynfynydd Gold Mine, Ganllwyd | Ganllwyd | Merionethshire | United Kingdom | Water | Watermill | Crushing mill, Mine mill/wheel | Mawddach |
| Dolmelynllyn Mill, Ganllwyd | Ganllwyd | Merionethshire | United Kingdom | Water | Watermill | Corn mill | Gamlan |