Mineralization is hosted in rocks of the Groupo Pucara (tuff, clay, mud, mudstone, claystone, vitrophyre, and sandstone).
Local structures include the Pisgah Fault, a NW-trending strike slip fault.
Related tectonic structures: Basin and Range province.
References
Madsen, B.M. (1970) Core logs of three test holes in Cenozoic lake deposits near Hector, California. USGS Bulletin 1296, 43 pp.
Sweet, W.E., Jr. (1980), The Geology and Genesis of Hectorite, Hector, California, in: Fife, D.L., and Brown, A.R., eds., Geology and Minreal Wealth of the California Desert: Santa Ana, California, South Coast Geological Society: 279-283.
Smith, George Irving (1985) Borate deposits in the United States: Dissimilar in form, similar in geologic setting, in Barker, J.M., and LeFond, S.J., 1985, Borates: Economic Geology and Production; Proceedings of a symposium held on October 24, 1984, at the fall meeting of SME-AIME in Denver, Colorado: New York, Society of Mining Engineers of the American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc: 38-51.
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