- Ogwen-Cegin valleys
- Welsh Slate Museum, Dinorwic Workings
- Nantlle, Moel Tryfan
- Gorsedda quarry, tramway and settlement, the Ynysypandy slate mill
- Ffestiniog slate landscape (postcard collected)
- Southern Gwynedd quarrying landscapes and transport systems
- Bangor University
"The extensive deposits of high quality slate in north Wales were exploited as far back as the Roman period, but it was in the 18th century that the industry began to grow significantly, expanding rapidly between 1856 and 1900, and remaining technically innovative until 1914. During the 19th century the north Wales quarries were major providers of roofing materials and slate products throughout the world, and the associated technologies of quarrying and transport infrastructure were also exported worldwide."
Source: UNESCO World Heritage Tentative List
Ffestiniog Railway in North Wales built in the 1830's for transporting slate from quarries at Blaeneau Ffestiniog to coast at Porthmadog for sea trnasport until the 1940's. Thanks to Kerstin of United Kingdom. Welsh themed stamps used.