SH 938 703
The easiest way (although not the shortest) is to park on the A544 between Llanfair TH and Llansannan (there is a lay by (ish) about a mile out of Llanfair TH heading to Llansannan with a public footpath marked on the left. Follow this path but keep right when you come to a fork (past some houses) and follow the track into the woods along the stream (picture below).
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Standard lead (& copper) mine style adits, additional numerous shafts but mostly collapsed and inaccessible.
The topography suggests that the mine was once fairly substantial but little seems to be now evident.
There are a number of shafts (fenced) on both sides of the stream although none on the right side appeared to be accessible at all. Those shafts on the left appeared to be mostly inaccessible. There are a number of adits on the left side of the stream and these appear to all be open. None of the passages appear to travel much distance (perhaps a couple hundred feet at most) except for one which forks and travels a little further (the apparent last one).
There is a “hole” in the floor in this last adit which is flooded to floor level with water and would be impassable except for a substantial wooden plank across it. This suggests that there may be lower (and flooded) workings which may explain the topography.
It is possible that there are more passages/adits. Certainly there are collapsed shaft entrances that would lead to adits and none of the adits found so far meet the surface shafts.
Release the Kraken .....