Tips
David Howells
April 14, 2026
Cwmorthin Slate Quarry is an impressive area, a magical hanging industrial valley above Tan y Grisiau that highlights Wales' industrial heritage with its massive works and ruins. It was in operation between 1810 and 1939 and has five different underground levels which were serviced with extensive trackways and machinery. Many of the surface buildings, such as the slate mills, can still be seen. If you are a photographer, this is the place to come in the early summer light or the cold winter mist.
Kai
August 9, 2023
Hiking
More information here:
historypoints.org/index.php?page=site-of-cwmorthin-slate-mill-near-tanygrisiau
historypoints.org/index.php?page=site-of-cwmorthin-slate-mill-near-tanygrisiau
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Details
Informations
Elevation 310 m
Weather
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Tuesday 12 May
11°C
4°C
76 %
Additional weather tips
Max wind speed: 33.0 km/h
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