
[NB: I’ve posted this and following images of a cairn-like structure set below and to the approx west of the summit cairn as ‘Interpretive’ to avoid any confusion with the summit cairn itself, a scheduled monument]
On the face of it this would appear the remains of industrial activity – Dyffryn Nantlle was subject to much quarrying back in the day (e.g. slate at Dorothea), plus lead and even apparently ancient copper mining – however check out the underlying footprint, particularly in following images. Is there more to this stone pile than is immediately apparent? A much older ancestry?
Image credit: Robert Gladstone