Llechwedd quarry, Slate quarry in Blaenau Ffestiniog, Wales.
The Llechwedd quarry features underground chambers extending 500 feet deep, connected by narrow gauge railway tracks through multiple mining levels.
John Whitehead Greaves established the quarry in 1846, leading to the discovery of the Old Merioneth Vein that transformed slate production in North Wales.
The site preserves the industrial heritage of Welsh slate mining through guided tours that demonstrate traditional extraction and processing methods.
Visitors can access the quarry via the Deep Mine Railway, which descends at a 30-degree angle through illuminated tunnels to reach underground caverns.
The quarry generates electricity through two hydroelectric plants, utilizing the high rainfall of the region to power operations and supply the national grid.
Location: Blaenau Ffestiniog
Inception: 1847
GPS coordinates: 53.00210,-3.93470
Latest update: March 7, 2025 10:05
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