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12 year old Jose Lucas Benabides chews coca leaves among the tailings in the compound of a silver mine, where he works with his mother.  The leaves stave off hunger and thirst, allowing him to work throughout the day without pausing for a lunch break.  His late father was a miner who died 5 years ago of silicosis, a respiratory disease caused by the inhalation of silica dust.  Widows of miners are permitted to scour the discarded rocks in search of silver ore to sell....Photo: Dermot Tatlow/Panos Pictures/Felix Features