Robert, certainly an interesting matter. Fact, evidence, and proof does
present a problem to day however - Medieval and all later mining having destroyed
most evidence obviously. Cwmystwyth in Mid-Wales I have reason to believe
holds some of these secrets, and the very old Snowbrook Mine certainly
originates from the time in question... but how much might have been lost to later
mining or through weathering. Absolute proof is very difficult. An interesting
subject, and one which I hope we will hear more of.
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