Steve - Some time ago I came across the following reference from a very old copy of the 'llustrated London News' - perhaps not one of the usual sources of information:
'Discovery of a Lead and Silver Mine Worked by the Romans. - Captain Reynolds, of Llanidloes, has discovered a valuable lead and silver mine, at Snowbrook, situate at the base of Plinlimmon, about eight miles north-east of Llanidloes. A sample of the ore has been assayed, and produced 80 per cent for lead, and 20 ounces of silver to the ton of lead. The mine is an old Roman working, and in all probability had not been opened for 1500 years before Captain Reynolds made the discovery.
April 3rd, 1858.'
I hope that this is of some help.
Alan.
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