Aberllefenni quarry, Slate quarry in Gwynedd, Wales
The Aberllefenni quarry consists of three distinct mining areas: Foel Grochan, Hen Gloddfa, and Ceunant Ddu, spread across the valley of Cwm Hengae.
The quarry operations started in 1500, when extracted slates were used for roofing the local residence Plas Aberllefenni, marking the beginning of industrial activity.
The slate from this quarry exhibits a deep blue color with exceptional hardness and density, making it particularly suitable for large architectural applications.
Access to the quarry was facilitated by the Corris Railway from 1859, which transported slate through the Dulas Valley to the town of Machynlleth.
Until its closure in 2003, Aberllefenni maintained the record as the longest continuously operating slate mine worldwide, spanning over five centuries of extraction.
Location: Gwynedd
Inception: 14 century
GPS coordinates: 52.67582,-3.82296
Latest update: March 6, 2025 18:39
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