Trevillett Quarry is in the parish of Tintagel in Rocky Valley where the Trevillett river flows out to the sea. Several mills once operated along the river and Trevillett Mill remains with many of its original workings intact.  A grand mansion was built by in the 16th Century close by to the Slate Quarry by its owners.

The local slate was laid down in the Devonian period as was much of Cornwall’s slate deposits some 400 million years ago. The metamorphosis of clay, shale & volcanic ash led to a rock that that is both strong & cleaves readily making it ideal for a range of uses both inside & out.

Fossils found within the rocks have some correlation with those found in Belgium & Germany

Trevillett Quarry was the largest slate quarry in Tintagel and at its height of activity employed 200 men. Today the site is smaller than it once was and there are considerably less employed, despite the excellent quality stone that continues to be extracted. Today the site largely concentrates on the production of roofing slate, alongside side a number of other products.

There is no blasting on site, instead the rock is broken out using a machine as it is a more environmentally conscious methodology.