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Cornish tin mining, 19th-century artwork. Miners working in a tin mine in Cornwall. Many such excavations were near the coast and extended out under the sea for nearly a kilometre. Some of the tunnels were only a few metres below the seabed. The mines employed hundreds of men and reached a depth of 400 metres. Thousands of tons of tin and copper were produced, but most of the mines had closed by the early 20th century. Artwork from the 13th volume (first period of 1894) of the French popular science weekly 'La Science Illustree'.
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