Cilgwyn quarry

Cilgwyn quarry is a slate quarry located on the north edge of the Nantlle Vale, in North Wales. It is one of the earliest slate quarries in Great Britain, being worked as early as the 12th century. King Edward I of England was reputed to have stayed in a house roofed by Cilgwyn slates, during the Welsh wars of independence.

Quarrying at Cilgwyn dates back to the 12th century. By the end of the 18th century a large number of small pits had grown into a substantial working.

The Cilgwyn Quarry Company was formed in 1800 by the Caernarfon solicitor John Evans. By the 1820s it had been taken over by the Cilgwyn and Cefn Du Slate Company, though this company collapsed in 1831. Quarrying later resumed at Cilgwyn but it failed again between 1843 and 1844, closing with debts of around £20,000. Cilgwyn was operating again by the 1850s and developed four main pits. In 1882, 7,430 tons of finished slate were produced. Between 1864 and 1895 between 200 and 304 workers were employed at Cilgwyn; this had dropped to 51 to 102 between 1918 and 1937. Quarrying continued at Cilgwyn until 1956.

In the early 2000s, the quarry was used as a waste dump by the local council, but landfill activity ceased in January 2009.

Cilgwyn was an opencast quarry comprising three main pits: Gloddfa Glitiau to the north-east, Old Cilgwyn to the west and Veingoch to the south-east. Earlier in its history there were a larger number of smaller pits. The mills stood on top of significant waste tips to the south and east of the pits. A tramway north ran from the mills to another waste tipping site to the north of the quarry at Bryn Byfryd Terrace.

Cilgwyn quarry was connected to the 3 ft 6 in (1,067 mm) gauge Nantlle Railway by a pair of inclines that dropped from the Cilgwyn mill level through Glantyfedw quarry to a junction at Talysarn Uchaf. Internally the quarry had an extensive network of 2 ft (610 mm) gauge tramways. These served the three main pits and the waste tips. A mile-long tramway ran from the mills round a horseshoe curve to a waste tip on the north side of Mynydd y Cilgwyn. In 1923 a connection was made from this tramway to the line connecting Fron quarry to Bryngywn. This allowed slates to be dispatched from Cilgwyn onto the Welsh Highland Railway, avoiding the need to transship slates from the internal quarry wagons into the Nantlle Railway's wagons.

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