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John Leivers, 59, of Amazonas Explorer, a Cusco outfitter company, at an inca sliver mine on the trail from Choquequirao to Vitcos. Incas mined gold and silver extensively for decorative, mostly jewelry puropses. The mines were consequently used by the Spanish who over the years worked thousands of locals to death in these dark oxygen deprived networks of tunnels. On a 100 year anniversary of Machu Picchu's first publication in the National Geographic, a 10 day expedition sets out to trace the explorer Hiram Bingham's path to Inca's most sacred city.