Records of both natural cave systems and man made mining networks. Reports include geological features, tunnel layouts, extraction methods (where applicable), environmental conditions such as stability and water presence and how subterranean systems have been utilised as tourist destinations over the years and becomes ever more popular highlighting peoples curiosity to see these hidden sites.
Penarth/Cambrian Slate Mine - Llangollen
Penarth and Cambrian Slate Mines were crucial Welsh operations, evolving from early extraction into significant industrial sites before their mid-20th-century closures.
Rhosydd Slate Quarry - Blaenau Ffestiniog
A 19th-century slate quarry, known for its extensive underground workings and rugged mountain setting.
Foel Grochan - Aberllefenni
Part of the longest continually operated slate mine in the world until its closure in 2003.
Slate Quarry Drainage Level - Wales
Serving as a drainage channel for a popular Welsh quarry.
Gaewern Slate Mine (The Car Cave) - Wales
A Former slate mine active from 1820 to 1970, is now a flooded "Car Cave" filled with abandoned vehicles and appliances.
Maenofferen Slate Mine - Blaenau Ffestiniog
Maenofferen Slate Mine in Blaenau Ffestiniog is a historic Welsh quarry that grew into a major slate producer in the 19th century.