The slate extracted from these caverns was traditionally used for roofing tiles and school slates across the United Kingdom.
The temperature inside the caverns remains consistently low throughout the year, usually around 10-12 degrees Celsius.
The site is located on a working farm known as Cae Gethin.
The caverns provide a clear viewpoint of the Llyn Peninsula and the mountains of Eryri.
Llanfair Slate Caverns are a series of former Victorian slate mines located near Harlech in Snowdonia, North Wales. The site features an extensive underground network of man-made caverns carved into the rock face during the 19th century. Visitors access the subterranean tunnels via a guided tour that explores the extraction techniques used by historic slate miners. The site offers panoramic views across Cardigan Bay and the peaks of the Snowdonia National Park. The caverns maintain a constant cool temperature regardless of external weather conditions. Remnants of mining machinery and original working conditions remain visible throughout the passages.
The elevated viewing platform outside the cavern entrance offers the best panoramic shots of the Cardigan Bay coastline.
Bring a warm jacket or fleece as the temperature underground is significantly colder than the surface.
Wear sturdy, non-slip footwear suitable for uneven, damp ground.
Check weather conditions beforehand if you plan to hike the hillside paths outside the caverns.
Do not attempt to explore the tunnels without a guide or outside of designated tour routes for safety reasons.
Typically open during the spring, summer, and early autumn months; closed throughout the winter season.
Do not touch the cavern walls or move any historical mining artifacts. Follow all instructions provided by the tour guide.
