1600 Grand Avenue
St. Paul, MN 55104
Dr. Greg Brick, Metro State University, will describe the 2004 rediscovery of saltpeter caves along the Minnesota shore of Lake Pepin. The caves were originally described by French fur-trader Pierre-Charles Le Sueur in 1700 and lost sight of for more than three centuries. Saltpeter was the most important constituent in the manufacture of gunpowder.