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 canyon nature formation ruins las medullas gold cast roman empire open technique hydraulic mining undermining water cliff trees

Las Medullas Gold Mine. Royalty-Free Stock Photography


Las Medullas Gold Mine. Stock Photo
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Las Medullas Gold Mine. #332586443
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Las Medullas - the largest most important open cast mine in the Roman Empire. The technique employed was a type of hydraulic mining which involved undermining a mountain with large quantities of water.