Interesting. I looked at this thinking it was local.
I gather that gold was found when they "panned" portreath beach and somewhere, I have a picture of chaps panning for Tin Oxide on Trevaunance beach.
I have often thought about panning a small stream the Truro side of Baldhu, as that is gold bearing.....
I would have thought you would have needed a lot of gold to register in the higher sands of a beach.....