Sorry for late reply....
Some Workings in that area were sold to Henry Remfry and John James of Truro in 1872 (ref. R.Barton History of China Clay 1966, some good pics that could be scanned in, but may need permission of Bradford Barton?). Wheal Remfry Clay Brick and Tile co listed in 1906, became part of ECC then Imerys, Clay pit still in operation producing Ceramic grade Kaolins.
If you need to go into more depth probably Wheal Martyn Museum can help you (they have more resources, as many of the books in the once massive ECC library ended up there).
There are several references to Henry Remfry in that era, not sure if they refer to the same person.
Is it safe to come out of the bunker yet?