In 1856, a "take note" (permission to explore for minerals) was granted by Sir Edmund Buckley to search for slate on Mynydd Hendre-ddu.

Hughes developed at least one open pit where the narrow vein reached the surface.

[1] A substantial mill was built east of the adit and equipped with machinery dragged from Aberangell station.

A terrace of cottages was built for married quarrymen, and a barracks at the quarry was for single men.

[1] In 1876, Buckley was declared bankrupt and forced to sell most of his estate, including the tramway and quarry, which were purchased by Dennis Bradwell.

[1] Edward Hurst Davies purchased the quarry after the death of Jacob Bradwell.

After the war, Davies sold the quarry and tramway to William Clayton Russon.

The Great Depression caused a drop in demand for slate, and the quarry closed in 1932.