Latitude: 38°44'34"N
Longitude: 122°45'52"W
A former Hg mine located in secs. 4 & 5, T10N, R8W, MDM, 0.4 km (1,300 feet) NNW of the Pine Flat area, adjacent to the Contact Mine.
The group comprises seven claims located in 1873 when a small amount of mercury was produced. The workings include nine crosscut adits and drifts on five levels that once extended for about 320 m. Remains of a washing plant and a retort are also present at the mine site.
The workings explored a ledge of silica-carbonate altered serpentinite occurring in a contact zone between serpentinite and sandstone. Both the ledge and the adjacent sandstone contained moderate amounts of cinnabar and native mercury.
Production data are found in: U.S. Bureau of Mines file data.
References
Becker, George F. (1888b), Geology of the quicksilver deposits of the Pacific slope: USGS Monograph 13, atlas: 377.
Bradley, W.W. (1918), Quicksilver resources of California, with a section on metallurgy and ore dressing: California Mining Bureau. Bulletin 78, 389 pp.: 191.
Ransome, Alfred Leslie & J.L. Kellogg (1939), Quicksilver resources of California: California Division Mines Report 35: 353-486.
Ross, C.P. (1940b) Quicksilver deposits of the Mayacmas and Sulphur Bank districts, California. USGS Bulletin 922-L: 330.
Bailey, Edgar H. (1946), Quicksilver deposits of the western Mayacmas district, Sonoma County, California: California Division Mines Report 42: 199-230.
Honke, Martin T., Jr. & Wm. E. Ver Planck, Jr. (1950), Mines and mineral resources of Sonoma County, California: California Journal of Mines and Geology: 46: 98-105.
Holmes, G.H. (1965) Mercury in California. US Bureau of Mines Information Circular 8252: 87-206.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 261.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 124.
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.
Bailey, E.H., USGS, personal files.
Mineral List
2 entries listed. 2 valid minerals.
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