Empire Mine State Historic Park is a state-protected mine and park in the Sierra Nevada mountains in Grass Valley, California, U.S. The Empire Mine is on the National Register of Historic Places, a federal Historic District, and a California Historical Landmark. Since 1975 California State Parks has administered and maintained the mine as a historic site. The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California".[3] Between 1850 and its closure in 1956, the Empire Mine produced 5.8 million ounces (165 tons) of gold, extracted from 367 miles (591 km) of underground passages.[4]
^"National Register Information System". National Register of Historic Places. National Park Service. March 13, 2009.
^"Empire Mine". Office of Historic Preservation, California State Parks. Retrieved October 10, 2012.
^"Empire Mine SHP". California State Parks. Archived from the original on December 16, 2011. Retrieved December 16, 2011.
^Forgione, Mary (February 21, 2014). "California: Park scraps gold mine tour after spending $3.5 million". Los Angeles Times. Retrieved May 9, 2016.
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