1. Mona Mine (nprn 300167) precipitation pits, where iron objects were immersed in copper-rich water and left to dissolve, giving copper precipitate. The remains include twelve pits or tanks, within an area 220m by 60m, separated by low stone walls.
(Source: Cadw scheduling description)
B.A.Malaws, RCAHMW, 02 February 2007.

2. RCAHMW AP965125/42-3
J.Wiles, RCAHMW, 24.11.2003.