Levels on the southern outcrop and inclines to the valley floor at Gwaelod y Garth associated with the Pentyrch ironworks and Melingriffith tinplate works. Remains of a possible horse gin on mountainside. The 1872 Llan drift was last to operate in 1915.
(A Guide to the Industrial Archaeology of South East Wales, AIA, 2003)
B.A.Malaws, RCAHMW, 05 November 2005.