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Cloddfa'r Lon Slate Quarry is a post-medieval and modern slate mill situated in Wales. The site exploits the Lower Cambrian bedrock beneath it, composed of mudstone, siltstone and sandstone formed during the Early Cambrian period. These lithologies provided the fine-grained material suitable for splitting into slate, which became the basis of commercial extraction at this location during the post-medieval era and beyond.
The quarry represents the industrial development of slate working in Wales, a region renowned for its extensive slate deposits and their exploitation from the sixteenth century onwards. The Lower Cambrian sequence at Cloddfa'r Lon offered the necessary geological conditions for slate production, with naturally jointed strata that could be worked and processed into roofing material and other products demanded by growing markets.
The site is protected by Cadw, the historic monuments service of Wales, under the reference CN302, recognising its importance as a record of Wales's industrial and economic heritage. The combination of the mill structures with the surrounding quarried landscape provides evidence of the methods, scale and duration of slate extraction that characterised this period of Welsh industrial development.
Cloddfa'r Lon Slate Quarry is a scheduled monument protected by Cadw under reference CN302. View the official record →
Cloddfa'r Lon Slate Quarry is a post-medieval and modern slate mill situated in Wales. It is designated a Scheduled Ancient Monument by Cadw under reference CN302.
Cloddfa'r Lon Slate Quarry dates from the post medieval/modern period, and is classified as a slate mill. It is one of over 32,000 scheduled monuments protected across the UK.
Cloddfa'r Lon Slate Quarry is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is CN302.
Several scheduled monuments lie within 10 km, including Hut Circle Settlement Above Gilfach (6.4 km), Cwm Llefrith cairn (7.6 km), Llystyn Gwyn Inscribed Stone (8 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Cloddfa'r Lon Slate Quarry's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Cloddfa'r Lon Slate Quarry stands on Lower Cambrian Rocks (Undifferentiated), bedrock that formed in the Early Cambrian. The rock here is mudstone, siltstone and sandstone.