| Name | Location | County | Country | Power source | Type | Function | River |
| Slate mill, Wrysgan Quarry, Blaenau Ffestiniog | Wrysgan Quarry, Blaenau Ffestiniog | Merionethshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill |
| Name | Location | County | Country | Power source | Type | Function | River |
| Slate mill, Wrysgan Quarry, Blaenau Ffestiniog | Wrysgan Quarry, Blaenau Ffestiniog | Merionethshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill |