The Hafna Mine has the most extensive and best preserved remains of any of the mines on the Gwydyr estate and it was once one of the most important lead mining areas in the United Kingdom. The remains include a stepped mill, incline, smelting house and round plan chimney on the western side of Bwlch yr Haearn. The mill dates from 1889-1905, it has a French design and has used water, steam and electricity. The mine is known to have last been used in 1919 and now there are interpretative panels to explain the history of the site.

Source: David Gwyn & Merfyn Williams (1996) `A Guide to the Industrial Archaeology of North West Wales?. Association for Industrial Archaeology.

Claire Parry, RCAHMW, 15 November 2011.