At this time a stationary steam engine was used to haul rock up from the open pit.

A small number of quarrymen were employed, but the quarry had shut again by the end of the decade.

[2] Like several other early slate quarries, Chwarel Ddu had an internal tramway using wooden rails with iron strapping on their surface.

Several of the iron running surfaces were discovered in the 1980s when the quarry site was being levelled to make way for road improvements.

[2] The quarry worked slate from the Nod Glas Formation which outcrops along the Conwy Valley.