Name Location County Country Power source Type Function River
Slate mill (1), Bwlch Cwmllan Slate Quarry Bwlch Cwmllan, Betws Garmon Caernarfonshire Wales Water Watermill Quarry mill/wheel, Slate mill Tributary to Cwm Llan
Slate mill (2), Bwlch Cwmllan Slate Quarry Bwlch Cwmllan, Betws Garmon Caernarfonshire Wales Water Watermill Quarry mill/wheel, Slate mill Tributary to Cwm Llan
Hafodlas Slate Quarry Mills Betws-y-Coed Caernarfonshire Wales Water Watermill Quarry mill/wheel, Slate mill Tributary to Llugwy
Slate mill, Aberllefenni Aberllefenni, Corris Merionethshire Wales Water Watermill Quarry mill/wheel, Slate mill Dulas
Slate mill, Dolgarth Slate Quarry Dolbenmaen Caernarfonshire Wales Water Watermill Quarry mill/wheel, Slate mill Ceunant Dolgerth
Graig Ddu Slate Works Blaenau Ffestiniog, Ffestiniog Merionethshire Wales Water Watermill Quarry mill/wheel, Slate mill
Slate mill, Drum Slate Quarry, Blaenau Ffestiniog Blaenau Ffestiniog, Ffestiniog Merionethshire Wales Water Watermill Quarry mill/wheel, Slate mill Gamallt
Slate mill, Rhyd-y-sarn Llan Ffestiniog, Ffestiniog Merionethshire Wales Water Watermill Quarry mill/wheel, Slate mill, Tannery Teigl
Felin Sarn Clwt-y-bont, Llanddeiniolen Caernarfonshire Wales Water Watermill Slate mill Marchlyn-bach
Slate mill, Minllyn Quarry, Minllyn Minllyn, Mawddwy Merionethshire Wales Water Watermill Quarry mill/wheel, Slate mill Nant Minllyn
Pant-yr-ynn Slate Mill Bethania, Blaenau Ffestiniog Merionethshire Wales Water Watermill Slate mill, Woollen mill Du-bach
Ynys-y-pandy Slate Mill Cwmystradllyn Caernarfonshire Wales Water Watermill Slate mill Cwmystradllyn
Slate mills, Croesor Quarry, Croesor Croesor Quarry, Croesor Merionethshire Wales Water Watermill Quarry mill/wheel, Slate mill
Slate mill, Wrysgan Quarry, Blaenau Ffestiniog Wrysgan Quarry, Blaenau Ffestiniog Merionethshire England Water Watermill Quarry mill/wheel, Slate mill