When you say Mineral Statistics do you mean the originals or the Exeter University "Cornish Mines" publication. The latter originally excluded iron pyrites (mundic), ochre etc. although they were included in the originals. Hopefully in the not too distant future a greatly updated version will appear which should include many of these omissions, although I am sure there will still be omissions and errors, so for in depth studies I would always recommend going back to the originals, many of which are on Google Books.
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