Open-Pit Mining: Penrhyn Slate Quarry Bethesda - Index
Open-Pit Mining: Penrhyn Slate Quarry.
Video and Interactive Satellite map.
It is reputed to be the world's largest slate quarry: the main pit is nearly a mile long and 1200 feet deep.
Open-Pit Mining: Explosion at Bethesda, Penrhyn Slate Quarry.
Video and Interactive Satellite map.
10,000 tons of slate is blown up at Penrhyn Quarry in Bethesda to commemorate winning the contract for the Welsh Assembly building in Llandudno Junction.