A 19th-century slate quarry, known for its extensive underground workings and rugged mountain setting.

Hendre Spar Mine, worked for Fluorspar and Calcite until 1981, was sealed in 2024 due to safety concerns.

Maenofferen Slate Mine in Blaenau Ffestiniog is a historic Welsh quarry that grew into a major slate producer in the 19th century.