Minllyn Slate Company

Formed in 1889 by the two sons of William Bullock to work Minllyn quarry, the last company to do so; the quarry closed for the final time in 1925.

Mines operated

Mine	Region	Years
Minllyn Slate Quarry	Gwynedd	1889–1925

Record created: 8 September 2026 · Last researched: 8 September 2026