Penrhyn quarry, Bethesda
Dinorwic quarry, Llanberis
Oakeley quarry, Blaenau Ffestiniog.

These three operations accounted for over half of all production in the industry.  They set the standards in engineering, quarrying techniques, wage rates and transportation.  Two of these quarries , Penrhyn and Oakeley, are still in operation today while Dinorwic, which closed in 1969, is now home to the Welsh Slate Museum.  To read more about each operation please click on the quarry names above.

Dinorwic quarry on the slopes of Elidir Fawr.

Back to the index page