2007-01-032022-02-032007-01-032022-02-03https://hdl.handle.net/11124/6744Date scanned: 2002-6-28.Top view. Empire Mines, Grass Valley, Calif.Held in the Russell L. and Lyn Wood Mining History Archive, Arthur Lakes Library, Colorado School of Mines.Donor: United States Bureau of Mines.Safety catch installation is shown at the Empire Mines, California. Gold was discovered in Grass Valley in 1850. The Empire Mine operated from 1850 to 1956 and was one of the richest and largest mines in the US, producing some 5.8 million ounces of gold. The Mine site was acquired by the State of California in 1975 and turned into a state park.Rights management statement available at: http://library.mines.edu/digital/rights.htmlGold mines and miningMine safetyUnderground miningStillImage