Glynrhonwy Quarries, Industrial slate quarries in Gwynedd, Wales
The site contains two adjacent quarries with extensive networks of pits and tunnels used for extracting high-quality slate from the mountainside.
The Lower Glynrhonwy quarry started operations in 1700, while the Upper Glynrhonwy section began production in 1861, both continuing until their closure in 1930.
These quarries represent the industrial heritage of Wales, demonstrating the methods and scale of slate extraction that supported local communities for generations.
The quarries connect to former railway networks through Glynrhonwy Siding, which linked to the Caernarfon to Llanberis branch until December 1956.
During World War II, the Lower Glynrhonwy quarry transformed into a munitions storage facility for the Air Ministry, serving this purpose until 1961.
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