Inside Galería de Orellán
The gold deposit at Las Médulas is in a Miocene alluvium comprising conglomerates of pebbles, sands and clays. The Romans drove tunnels and shafts inside the hill, then used water to 'blast' the hillside out !
This photograph is by MossSphere and was uploaded July 28th 2009. © MossSphere please do not copy or distribute without prior express permission.
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