Llechwedd Slate Caverns

Tourist attraction in Gwynedd, Wales

Llechwedd is a visitor attraction near Blaenau Ffestiniog, Gwynedd, Wales. It details the history of slate quarrying in the town and specifically the Llechwedd quarry in which it is located. The main aspect of Llechwedd is its Llechwedd Deep Mine Tour which has the steepest narrow gauge railway in the UK and travels over 500 feet underground to the disused slate caverns, and the Quarry Explorer Tour which heads out to the furthest reaches of the Llechwedd site to explore the history of mining in the area. The attraction also incorporates Mountain biking tracks, Zip lines and giant underground trampolines. Bounce Below is right beside the underground zip wire, Zip World Caverns and Zip World Titan the longest zip course in Europe.

The 2ft narrow gauge Miners' Tramway, opened in 1972 under the name "Quarry Tours", was a railway travelling 800 metres underground. The trains were hauled by battery electric locomotives and travelled through tunnels and into a series of quarry chambers. The tramway's closure in 2014, as part of a revamp of the caverns, caused some controversy. The Deep Mine, opened in 1979, is accessed by the 3ft narrow gauge Deep Mine Railway, a steep passenger funicular with a gradient of 1:1.8 or 30°. At the foot of the funicular, visitors can walk through several tunnels and chambers of the mine. In 1992 the Deep Mine displays were upgraded using audio visual technology supplied by Eurodisney along with the Zip World wire course outside. As part of the 2014 developments a new guided Victorian Mine Tour opened combining the funicular, the tunnels from the two previous tours and some tunnels newly opened to the public. In 2015 the Zip World Caverns wire course opened within the caves. In January 2019 a television crew took over the caverns for a week to film the world's first ever underground games show, Y Siambr, broadcast later in the year on S4C.