No one makes eye contact. They're too intent on the ground, searching for one of Central Minnesota's oldest buried treasures: Lake Superior agates. Butch Goldenstein figures he's found hundreds of ...

Thanks to fire and ice, treasures abound. This summer, agate collectors are on the hunt in eastern Minnesota and western Wisconsin, searching for rocks that can fetch as much as thousands of dollars ...

DULUTH — About 1.1 billion years ago here, fissures opened in the surface of the earth, depositing lakes of molten rock near what would eventually be the Twin Ports and Lake Superior. This is ...