There is nothing known about the history of this mine but it was probably worked in conjunction with Llewynadda or North Alltycrib at some time.
Hughes 1981 indicates a working period from 1856 to 1860 during which time about 175 tons of ore was produced.
There are three levels ascending hillside from the river on the Cwm Leri lode. The highest No 1 is open and was entered some years ago and found to be in an actively collapsing state, more recent falls blocked it completely a short distance in.
Middle adit, the no 2, is collapsed and its cutting crossed by a banked up forest path, there is also remains of what may have been a shaft.
The deep adit, the no 3, which is down by the river, has the remains of dressing floors immediately adjacent, however these are nothing at all to do with this mine but are associated with the unsuccessful Talybont Lead Mines 1910 operations. See Alltycrib.
There was a tramway connecting these with Pryce’s Tunnel although most of the material processed was from Felix’s Shaft, this being the shaft cut by Wilkinsons Level, ore being raised to that level by a 3HP Almanco oil engine, mountings are still to be seen.
The Cwm Leri deep adit is technically open, but I have it on good authority that the inner reaches are partially filled with fines which were pumped in from the adjacent dressing floors; this now forms a sort of quicksand. This makes it unsafe to enter.