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Alberta Benabides wakes up her children Beimar (8), Bimer (6) and Gladys (6) to go to school.  Alberta is the widow of a miner who died 5 years ago of silicosis, a respiratory disease caused by the inhalation of silica dust.  She works breaking rocks among the tailings in the compound of a silver mine, where widows of miners are permitted to scour the discarded rocks in search of silver ore to sell..Photo: Dermot Tatlow/Panos Pictures/Felix Features