I mean it is not like the Romans had a copper producers council that kept track of yearly production.
Pliny's Naturalis Historia, books XXXIII through XXXVII. (Wikipedia.)
Romans were famous for the high standard of their bureaucracy. Maybe you know something I don't, but all things being equal, I wouldn't bet against them having a copper producers council that kept track of yearly production -- or more likely a copper production government office.
Also, simply googling roman copper production turns up a whole lot of hits which indicate in one way or another that Roman copper production was remarkable for its quantity; this seems to be a widely accepted fact.
As to anything else on that chart, I have no idea.
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Date: 2014-03-04 04:39 am (UTC)Pliny's Naturalis Historia, books XXXIII through XXXVII. (Wikipedia.)
Romans were famous for the high standard of their bureaucracy. Maybe you know something I don't, but all things being equal, I wouldn't bet against them having a copper producers council that kept track of yearly production -- or more likely a copper production government office.
Also, simply googling roman copper production turns up a whole lot of hits which indicate in one way or another that Roman copper production was remarkable for its quantity; this seems to be a widely accepted fact.
As to anything else on that chart, I have no idea.