'The copper ore was smelted at the Low Mill site 200 yards south of the present day Youth Hostel about 1895, but the smelt mill was destroyed by a high wind in that year. It is still possible to find cones of slag in the locality, and the wire-like pieces of copper suggest by their texture that the smelting process was incomplete or inefficient." M Davies-Shiel & JD Marshall "Industrial Archaeology of the Lake Counties" David & Charles 1969.