When you go to the bird hide in Marazion Marsh with a round pool in view, I presume that is a relic of part of the same mine workings. I've been told there was a mine working there by someone. £ 300,000 worth of minerals was a vast booty in the mid nineteenth century.
This should not be too hard to figure with the 1936 OS.
That £300,000 is about £250 million today.
Currently working through some text on the Knights Hospitallers, not your lot are they? Trouble is a lot of it is in Latin, that will take a while. But when I have finished the coastline info, I will get on with working out a coastal map.
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