Homestake Mine (South Dakota)

The Homestake Mine was a deep underground gold mine located in Lead, South Dakota. Until it closed in 2002 it was the largest and deepest gold mine in North America, producing more than 40 million ounces (approximately 1.25 million kilograms) of gold. The Homestake Mine is famous in scientific circles for being the site at which the solar neutrino problem was first discovered. This became known as the Homestake Experiment. The deep underground laboratory was set up by Raymond Davis Jr. in the mid-1960s to become the first experiment to observe solar neutrinos.

• http://en.wikipedia.org/wiki/Homestake Mine (South Dakota)
• Page 4 - Philbrick, N., 2010, The Last Stand: Custer, Sitting Bull, and the Battle of the Little Big Horn: Viking, New York, 466p.