Try Burt, Roger, Cornish Mining: Essays On The Organisation Of Cornish Mines
And The Cornish Mining Economy, David And Charles, 1969.
In the index it comes under "sales of ores"
For actual stats you need to see Burt, Roger, Cornish Mines, University of
Exeter, 1987, but there is talk of an online database for this info?
Tanya
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