Graig Ddu Slate Works, Blaenau Ffestiniog

A water-powered quarry mill/wheel and slate mill in the historic county of Merionethshire, Wales.

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Graig Ddu slate works was built in the 1880s and was initially water-powered. It was supplied with slate from the quarry further uphill by means of an inclined plane. Several reservoirs, or dammed natural lakes, were used to supply water , by means of existing streams, leats or iron pipes, supports for which have survived. On the works site is a waterwheel pit and buildings. In the early C20 water power was superseded by a gas-powered engine, the base of which has survived. On the W (downhill) side of the works are spoil tips. The works continued in production until 1946.

Full details

Power source Water
Mill type Watermill
Mill function Quarry mill/wheel, Slate mill
Archive ID 13269
Location Blaenau Ffestiniog, Ffestiniog
Historic county Merionethshire
Country Wales, United Kingdom
NGR SH 71575 45477
Latitude/longitude 52.99118550, -3.91476595




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