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Dorothea Quarry is a post-medieval and modern slate quarry located in Wales, where Lower Cambrian bedrock of mudstone, siltstone and sandstone has been worked to extract slate. The site comprises the principal structures associated with large-scale quarrying operations, including pyramids of waste, inclines, a mill and winding houses. These features are characteristic of the industrial quarrying landscape that developed as slate extraction intensified from the eighteenth century onwards. The underlying geology—Lower Cambrian rocks formed during the Early Cambrian period—provided the fine-grained, fissile slate suitable for roofing and other applications that drove the economic development of Welsh quarrying regions.
The arrangement of quarry workings, processing facilities and transport infrastructure at Dorothea reflects the technological demands of extracting and dressing slate at scale. The inclines facilitated the movement of material across the sloping quarry face, whilst the winding houses housed the mechanical equipment necessary for hauling operations. The pyramidal heaps of waste or tailings are a distinctive visual legacy of quarrying, marking the volume of rock displaced to obtain commercial slate.
Dorothea Quarry is protected by Cadw, the Welsh heritage monument service, under reference CN199, recognising its significance as an archaeological and industrial heritage site.
Dorothea Quarry, Pyramids, Inclines, Mill & Winding Houses, etc is a scheduled monument protected by Cadw under reference CN199. View the official record →
Dorothea Quarry is a post-medieval and modern slate quarry located in Wales, where Lower Cambrian bedrock of mudstone, siltstone and sandstone has been worked to extract slate. It is designated a Scheduled Ancient Monument by Cadw under reference CN199.
Dorothea Quarry, Pyramids, Inclines, Mill & Winding Houses, etc dates from the post medieval/modern period, and is classified as a quarry. It is one of over 32,000 scheduled monuments protected across the UK.
Dorothea Quarry, Pyramids, Inclines, Mill & Winding Houses, etc 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 CN199.
Several scheduled monuments lie within 10 km, including Hut Circle Settlement Above Gilfach (6.2 km), Llystyn Gwyn Inscribed Stone (7.7 km), Huts and Enclosures, Cwm Llefrith (8 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Dorothea Quarry, Pyramids, Inclines, Mill & Winding Houses, etc'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.
Dorothea Quarry, Pyramids, Inclines, Mill & Winding Houses, etc stands on Lower Cambrian Rocks (Undifferentiated), bedrock that formed in the Early Cambrian. The rock here is mudstone, siltstone and sandstone.