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Mining in Spain - Vindex - 11-20-2014
Fascinating LiDAR images of the gold mining techniques used by the Romans. This article is about Spain but there are many parallels with the gold mine in Dolaucothi in Wales.
http://www.pasthorizonspr.com/index.php/archives/11/2014/extensive-roman-gold-mining-hydraulic-system-discovered-in-spain