Latitude: 38°30'31"N
Longitude: 122°26'20"W
A perlite occurrence located in sec. 32, T8N, R5W, MDM, 6.6 km (4.1 miles) WNW of Lake Hennessey on the E side of Napa Valley and 2.8 km (9,000 feet) E of St. Helena (opposite side of the valley). Located also in secs. 33, 34 & 35.
References
Davis, Fenelon Francis (1948), Mines and mineral resources of Napa County, California: California Division Mines (Report 44): 44(2): 171.
Weaver, C.E. (1949), Geology and Mineral Deposits of an Area North of San Francisco Bay, California: California Division of Mines Bulletin 149: 98-104.
USGS MRDS database (2005), loc. file ID #10115607.
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