[3] In early January 1868, W. W. Jones leased land in Dol-gôch ravine and started trying to establish a quarry.

Jones was a local prospector who opened many mines in the area; most of them were unsuccessful, with the exception of the Tonfanau stone quarry, near Tywyn.

[3] In April 1872, Jones gave up his lease to the Dolgoch Slate and Slab Company Limited.

The landowner, Athelstan John Soden Corbet, agreed a lease for the Dolgoch Slate and Slab Co. Ltd.

At the time, Athelstan Corbet was in considerable debt, and hoped that the Dolgoch quarry would pay this off.

The Dolgoch farm, on which the quarry lies, was sold to Edward Lyon, of Scrigford, Staffordshire.

[3] In 1897, the newly formed Dolgoch Slate Limited tried to secure a 25-year lease for the land occupied by the quarry on 2 August 1897.

These veins are the southern edge of the Harlech Dome anticline which surfaces in the north at Blaenau Ffestiniog.

It is about 60 feet (18 m) thick but contains low-quality, friable slate that contains a large number of fossils, predominately graptolites.

It is approximately 100 feet (30 m) long and dog-legs to the right slightly, ending at a chamber that is open to the sky, but fenced off for safety.

[2] Slate from the quarry is believed to have been hand-ported to the nearby Dolgoch station, on the Talyllyn Railway.