Moelwyn Slate Quarry, Slate quarry at Tanygrisiau, Wales.
The Moelwyn Slate Quarry features seven inclines carved into the mountainside, with excavated chambers stretching across multiple levels of the rock face.
Initial prospecting began in the 1820s, but the Great Moelwyn Slate Company only established formal operations in 1860, operating intermittently until final closure in 1897.
Families inhabited the quarry barracks in remote conditions, with literacy classes provided for workers and their children starting from the 1860s.
The quarry mill operated at a lower elevation between inclines 4 and 5, using water from Llyn Stwlan to power slate processing operations.
The construction of Ffestiniog Power Station in 1960 altered the original site, removing sections of the seventh incline while preserving most other historical structures.
Location: Gwynedd
GPS coordinates: 52.97880,-3.99500
Latest update: March 14, 2025 22:30
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