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Using the metal detector to locate "treasures" at an old mine site. The fencing that you see in the background is to protect against falling into an open hole. Many of the very rich silver veins were exposed on surface and mined out completely. (Author: Joseph D'Oliveira)

Using the metal detector to locate "treasures" at an old mine site. The fencing that you see in the background is to protect against falling into an open hole. Many of the very rich silver veins were exposed on surface and mined out completely. (Author: Joseph D'Oliveira)

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