By Magda GIBELLI At 10 years old, Martin cannot read, but he is an old hand at detecting traces of the gold he and his young cousins dig for at an open-pit mine in southeastern Venezuela. In the town of El Callao, extracting gold from soil starts as a kid’s game, but soon becomes a full-time job that human rights activists slam as dangerous exploitation. Small and agile, the children’s size helps them shimmy into […]