Latitude: 38°44'35"N
Longitude: 122°45'1"W
A Hg occurrence/prospect located 4.0 km (2.5 miles) SW of Castle Rock Springs.
A single adit, driven in the late 19th century to explore a narrow mass of silicified serpentinite for mercury, but no ore was found. There are no records of output.
References
Bailey, E.H. (1946): Quicksilver deposits of the Western Mayacmas District, Sonoma County, California. California Journal of Mines and Geology 42, 199-230.
Honke, M.T., Jr., and Verplanck, W.E., Jr. (1950): Mines and Mineral Resources of Sonoma County, California. California Journal of Mines and Geology: 46(1): 98-105.
Holmes, G.W., Jr. (1965): Mercury in California. In: United States Bureau of Mines Information Circular 8252.
Rytuba, J.J., Hothem, R.L., May, J.T., Kim, C.S., Lawler, D., and Goldstein, D. (2009): Environmental Impact of the Contact and Sonoma Mercury Mines on Water, Sediment, and Biota in Anna Belcher and Little Sulphur Creek Watersheds, Sonoma County, California. USGS Open-File Report 08-1381.
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