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The slate quarries at Cilgerran are various former slate quarries, around the town of Cilgerran, in Pembrokeshire, Wales, United Kingdom. They were mostly situated on the south side of the River Teifi's gorge. They played a significant role in Wales' slate industry, being the only significant quarries in South Wales apart from those around Rhoshill.

The quarries' produce was mostly transported to the port of Cardigan for export by sea, although some was used for buildings within the town, or exported directly by railway for use within Britain. Wharves were built east of the town on the River Teifi (at 52.05714°N, -4.61519°W), to load slate into boats for transport to Cardigan.

There were two groups of quarries at Cilgerran – the ones north of the town, known collectively as the Forest quarries(sometimes spelled as Fforest quarries), and those to the east of the town, around Cnwcau, sometimes called the Town quarries. The Forest quarries were almost immediately opposite (the other side of the Teifi Gorge from) Rhoshill.

History
Slate was first quarried at Cilgerran by John Edwards, in the late 1790s. He opened a quarry north of the town, in the land known as 'Forest' (near the Caernarfon Farm), called the Lower quarry or Forest quarry – at the site of what became Quarry Caernarvon. Later, with his two sons John and Thomas, Edwards opened another quarry slightly higher up the river, known as the Gigfran quarry ('Gigfran' is Welsh for 'Carrion crow'). Soon afterwards, John Bowen opened the Plain quarries, and around this time the Castle quarries and Moses' quarry were also opened, by George John and David John, and Moses Griffith, respectively. Upon the death of John Edwards (around 1830), Thomas Lloyd, of Coedmawr, and Oliver Lloyd, of Cardigan, acquired the Lower quarries, and began expanding them on a large scale. However, they sold the quarries soon afterwards, to James Stephens, of Llechryd.

In c.1837, another quarry was opened in the 'Forest' estate, by Mr. James Mathias of Cilgerran. It was called 'Quarry Forever', and situated adjacent to Gigfran quarry. About the same time, Gigfran quarry became exhausted and was thus given up. The industry peaked in the late 19th century, its continuance until that time supported by the coming of the railway in 1869.

Geology
The slate quarried at Cilgerran is from the upper part of the Nantmel Mudstones Formation. This slate formed in the Ashgill part of the Ordovician era, which lasted from approximately 448 to 443.8 years ago.