Clogwyn y Fuwch Slate Quarry
|Date||14 July 2012|
|Location||Mynydd Deulyn, Gwydyr Forest||SH 75910 61919; 53.13992°N, 3.85653°W|
Mynydd Deulyn (two-lake mountain) rises between, and just over 200m above, the lakes Llyn Crafnant and Llyn Geirionydd in the Gwydyr Forest. Perched up on its northern face sits Clogwyn y Fuwch (cow cliff). The quarry there is thought to be one of the oldest slate mines in Wales. It comprises five levels linked by an incline with adjacent spoil heap clinging to the vertiginous slope.
Large caverns were quarried at Clogwyn y Fuwch, a practice which became outmoded in the later 19th century, being superseded by safer methods employing honeycombed chambers. William Turner — who was later to turn his attentions to quarrying concerns at Blaenau Ffestiniog — obtained a lease on the quarry in the 1790s and it was worked by Cumbrian miners, who brought with them characteristic techniques such as the use of dry-stone lined, cut-and-cover ‘Matt-Spedding’ tunnels and also the siting of slate splitting and dressing huts (waliau) inside the caverns themselves.