Not sure if i've asked this before but......
Somewhere up the Valency valley in Boscastle, i've vauge memories of an adit or 2 heading off into the hillside. As its 25 years since i was last there, i may be wrong but:
Its wasn't far from the Gifteque in Boscastle (the big carpark what got wiped out by the flood).
Its on the right hand side as you walk up the valley quite high up the bank.
Ring any bells with people?. Pretty sure i did ask before but didn't note down the answer!.
DP