Boyer Mine (Wheeler Mine; Shanks and Copps), Warm Springs Dam, Coast Range, Sonoma Co., California, USA
A former Mn mine located 2.6 km (8,500 feet) SE of Skaggs Springs (now under a reservoir) and 4.9 km (3.0 miles) S of the dam.
Mineralization is hosted in chert and shale.
ReferencesBradley, W.W., Huguenin, Emile, Logan, C.A., Tucker, W.B., and Waring, C.A. (1918), Manganese and chromium in California: California Mining Bureau. Bulletin 76: 82.
Trask, Parker Davies, Ivan F. Wilson & F.S. Simons (1943), Manganese deposits of California – a summary report: California Division Mines Bulletin 125: 186.
Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 283.
| 'Psilomelane'|| Pyrolusite|
2 entries listed. 1 valid mineral.
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New Locality Added: John Taolo Gaetsewe District, Northern Cape Province, South AfricaFrom Debbie Woolf, 7th Mar 2014 21:48:59