Julia Guarniz, a street vendor in the Peruvian highland village of
Choropampa, watches blankly as a seven-vehicle convoy thunders past. "They scare
me," she says, pointing at the "hazardous materials" signs on the sides of the
juggernauts. "When I see them, I worry that it might happen again."Similar convoys carry toxic material through the village several times a day
on the degraded highway that runs 600km from Yanacocha, the world's most
productive gold mine, to the port of Callao in Lima.
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