Lecture is presented by historian Troy Lambert. Historically, once a mine played out, often the miners or company moved on, leaving behind an empty hole, contaminated material, and even equipment if removing it was too expensive. 1pm at Idaho Museum of Mining and Geology, 2455 Old Penitentiary Rd, IMMG Members-free, nonmembers-$5, www.idahomuseum.org, or Eliza 571-5720.