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Mount Diablo Mine (Mt. Diablo Mine; Diablo Mine; Ryne Mine), Mount Diablo (Mt Diablo), Mount Diablo State Park, Clayton, Diablo Range, Contra Costa Co., California, USA

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Latitude & Longitude (WGS84): 37° 52' 54'' North , 121° 54' 46'' West
Latitude & Longitude (decimal): 37.8816666667, -121.912777778

A former Hg mine located in the SE¼ sec. 29, T1N, R1E, MDM, on the E side of Mount Diablo. The Mount Diablo Mine and the Ryne Mine were consolidated in 1930. Worked 1875-1877 and again briefly in 1930.

Mineralization is along the contact of a diapir (upthrust plug) of Franciscan sediments and serpentine intruded into sedimentary rocks of the Great Valley sequence. Near the mine much serpentine has been converted to silica-carbonate rock.

Mineral List

23 valid minerals. 1 (TL) - type locality of valid minerals.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Ransome, Alfred Leslie & J.L. Kellogg (1939), Quicksilver resources of California: California Division Mines Report 35: 377.

Ross, C.P. (1940a) Quicksilver deposits of the Mount Diablo region, Contra Costa County, California. USGS Bulletin 922-B, 54 pp.: 41, 42, 44.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 492.

Pampeyan, Earl Haig (1963), Geology and mineral deposits of Mount Diablo, Contra Costa County, California: California Division Mines & Geol., Special Report 80, 31 pp.: 24.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 148, 156, 178, 213, 254, 258, 261, 323, 332, 337, 349, 379, 382.

White, D.E. (1967) Mercury and base-metal deposits with associated thermal and mineral waters. In: H.L. Barnes (Editor), Geochemistry of hydrothermal ore deposits. Holt Reinhart and Winston, New York: 585, 591.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 64, 74, 127, 185, 263, 264, 266, 270, 273, 274, 275, 278, 303, 351, 427.

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