The Welsh Slate group consists of 3 quarries: Penrhyn, Ffestiniog and Cwt-y-Bugail. Welsh Slate is the largest slate producer in the UK, employs over 200 people and exports its high-end slates to quality slate jobs all over the world.
Its is the unique geology of Welsh Slate which sets it apart from other quarries in a class of its own.
The slate deposits in Penrhyn were originally laid down in the pre-Cambrian era - some 600 million years ago. As such, they are some 200 million years older from most other slates and have been 'baked and cooked' in the earth for this extra time. As a result they are a much stronger and harder slate and will last centuries. The sediments which formed the slate are also extremely pure. There are no potential damaging pyrites or other elements found in these slates, that may be found in slates from other parts of the world.