| Name | Location | County | Country | Power source | Type | Function | River |
| Hafodlas Slate Quarry Mills, Betws-y-Coed | Betws-y-Coed | Caernarfonshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill | Tributary to Llugwy |
| Name | Location | County | Country | Power source | Type | Function | River |
| Hafodlas Slate Quarry Mills, Betws-y-Coed | Betws-y-Coed | Caernarfonshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill | Tributary to Llugwy |