Three large, capped shafts remain on the lower slopes of limestone crags east of Cae Harry (SJ 1915 5890). One shaft (SJ 1920 5885) has a broken cap, revealing a deep, well-built stone-lined structure. Another shaft mound east of Pwllhelyg (SJ 1955 5875) may be linked to the same vein or a branch of the Blaen-y-nant Vein.

1880s Bryn Alyn sett taken over by the Great New Westminster Company.