1. Shaft as marked on OS 6 inch 2nd edition 1905 map. Uncertain as to shafts function. Possible prospecting shaft or lead mine. Uncertain. Now submerged beneath reservoir (RSJ 2000)

2. North end (outlet) of the 1 mile 437 yard long Dol-y-mynach Tunnel (inlet end is nprn 309538), carrying water from Dol-y-mynach Reservoir (nprn 309539) to the Foel Valve Tower (nprn 32527), thereby making available the waters of the Claerwen River to the Scheme (nprn 96459).
B.A.Malaws, 24 November 2003.