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I wasn't exactly sure that I wanted to take the cooperative mine tour in Potosi, Bolivia. It's a working silver mine, meaning that going into the caves involves a voyeuristic view of a painstaking job with tight, claustrophobia-inducing chambers, dirt and dust containing anything from silica to asbestos, and wretched climbs. On one hand, the Potosi mine tour seemed interesting: a chance to see something in action that I would never see elsewhere. On another, it seemed kind of scary, dark, and dangerous. Not to mention the fact that you're going there to watch people work. Do their job. Their dangerous...