| Reference | {Deposit:: Clark, W.B., 1970, Gold districts of California: California Division of Mines and Geology Bulletin 191, p. 53.}{Deposit:: Johnston, W.G., Jr., 1940, The gold quartz veins of Grass Valley, California: U.S. Geological Survey Professional Paper 194, 101 p.}{Deposit:: Koschmann, A.H., and Bergendahl, M.H., 1968, Gold-producing districts of the United States: U.S. Geological Survey Professional Paper 610, 283 p.}{Deposit:: Lindgren, W., 1896a, Geologic atlas of the United States - Nevada City Special Folio: U.S. Geological Survey Folio 29.}{Deposit:: Lindgren, W., 1896b, Gold-quartz veins of Nevada City and Grass Valley: Seventeenth Annual Report of the U.S. Geological Survey, Part 2, p. 1-262}{Deposit:: MacBoyle, E.M., 1919, Mines and mineral resources of Nevada County: Sixteenth Annual Report of the State Mineralogist, California State Mining Bureau, p. 1-270.}{Deposit:: McQuiston, F.W., 1986, Gold: The saga of the Empire Mine: 1850-1956: Empire Mine Park Association, Grass Valley, California, Blue Dolphin Pub., 95 p.}{Deposit:: Starr, G.W., 1900, The Empire Mine, past and present: Mineral and Scientific Press, vol. 81, p. 120, 152, 184-185.}{Deposit:: Additional information on the Empire - North Star Mines is contained in File No. 331-9342 (CGS Mineral Resources Files, Sacramento)} |