Robert wrote
<Can anyone tell me how stamps were used in copper dressing? >
Try: F.B Mitchell 1978 'Ore Dressing in Cornwall 1600-1900' Jour
Trevithick Soc vol 6
This offers some explanation. Only poorer grades of ore were stamped,
usually after having undergone a series of sorting processes where the
better material had already been separated.
There is documentation and field evidence for stamping mills as well as
crushing roller mills at the copper mines around Buckfastleigh.
All the best
Phil Newman
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