ELDORADO DO JUMA, Brazil - It's a gold rush in the Amazon jungle, driven by the Internet. Speeding past unbroken walls of foliage, a motorboat packed with gritty prospectors veers toward the shore of the Juma river and spills its passengers into a city of black plastic lean-tos veiled by greasy smoke. All around them are newly dug pits, felled trees, misery and tales of striking it rich. This is Eldorado do Juma, scene of Brazil's biggest gold rush in more than 20 years. . . .
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