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Dear List, I have been searching for data on the above but have drawn a complete blank. I am trying to determine a comparison of the percentages of silver per tonne of lead ore contained in the various lead ore fields in the UK. In other words, Derbyshire, Mendip, S. Wales, Aberystwyth, Devon ect. Is such data available? Can anyone assist? Any information gratefully received, Kindest regards, Trevor.