Non-archaeological rectangular parch mark measuring approximately 21 metres by 10 metres, with a parallel line running from the centre of the rectangle to the south western edge of the rectangle. The parch mark is located on the south eastern edge of the former Pen-y-Bryn lead mine (NPRN 395). Discovered during the Royal Commission's programme of archaeological aerial reconnaissance by Toby Driver on 11th September 2015.
M. Ryder, RCAHMW, 19th November 2018.