San Geronimo prospect, San Geronimo, Marin Co., California, USA
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Workings incolude a 200 foot deep shaft that has been filled in as a safety precaution.
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Ver Planck, Wm. E., Jr. (1955), Mines, mineral resources and mineral industries of Marin County, California: California Journal of Mines and Geology, California Division of Mines (Report 51): 51(3): 268-269, 280, Pl. 4.