Cavagnaro prospect, Calistoga Hot Springs, Calistoga District (Silverado District), Mayacmas Mts (Mayacamas Mts), Napa Co., California, USA

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An Mn occurrence/prospect located in sec. 3, T9N, R6W, MDM, 2.5 km (8,300 feet) SE of Calistoga Hot Springs (0.5 mile W of the Aetna Quicksilver Mine). Operated by Charles Cavagnaro.

The ore body is 1.83 meters thick and 30.48 meters long, and is surrounded by serpentine. It is cut off by greenstone on the SW. Serpentine has altered to quicksilver near the prospect, with traces of cinnabar. The ore body is massive, brittle brown material with Mn films on fissure walls and small spherules. The brown ore is mainly iron oxide with a small amount of Mn xides and opal.

No production.

References

Bradley, W.W., et al (1918), Manganese and chromium in California: California Mining Bureau. Bulletin 76: 51.

Averill, Charles V. (1929), Redding field division, Lassen and Modoc, Napa, Lake, Glenn, Mendocino Counties: California Division Mines Report 25: 219.

Trask, Parker Davies, Ivan F. Wilson & F.S. Simons (1943), Manganese deposits of California – a summary report: California Division Mines Bulletin 125: 145.

Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 157-158.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 213.

USGS MRDS database (2005), loc. file ID #10031657.

Mineral List

Cinnabar

'Manganese Oxides'

Opal

Rhodochrosite

4 entries listed. 3 valid minerals.