ECHO MOUNTAIN — A half hour after her mom picked her up at school in Evergreen, 9-year-old Lucy Margolin was putting on her gear in the lodge at a modest ski area perched 3,000 feet above Idaho Springs, raring to go for an evening of skiing with her friends. With most of Echo Mountain’s terrain rated intermediate, Margolin knew she could ski with confidence, and that her mom didn’t have to worry about her. “Me and my friend get to ride the chairlift by ourselves and ski down by ourselves,” Margolin said Wednesday while gearing up for an experience that is not often found in Colorado skiing: riding on lighted slopes located close to the metro area.