Mine detail: Twin Peaks

Previously called ''

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Location

Lat / long: 38.66238, -122.53496

Resource(M)

Primary: Mercury
Tertiary: Chromium
Ore: Chromite, Cinnabar
Gangue: Saponite

Production

Operation type: Unknown
Production size: Small
Development status: Past Producer
Production years: 1902, 1904, 1907 - 1908, 1911, 1915 - 1916, 1918, 1940 - 1943
First production started: 1902

Geology

Host type:Serpentinite
Structure:Serpentine - Sandstone Contact
Alteration processes:Silica Carbonate Alteration Of Serpentine

References

MRDSM055676
DEP10040802
Reference{Deposit:: HOLMES, G. W., JR., 1965, MERCURY IN CALIFORNIA: IN USBM IC 8252}{Deposit:: BAILEY, E. H., USGS, PERSONAL FILES}{Deposit:: YATES, R. G. AND HILPERT, L. S., 1946, QUICKSILVER DEPOSITS OF THE EASTERN MAYACMAS DISTRICT, LAKE AND NAPA COUNTIES, CALIFORNIA: CALIF. JOUR. OF MINES AND GEOLOGY, V. 42, P. 231 - 286}{Deposit:: BRADLEY, W.W., 1918, QUICKSILVER RESOURCES OF CALIFORNIA: CJMG BULL. 78, 389 P.}{Deposit:: 5) DAVIS, F.F., 1948, MINES AND MINERAL RESOURCES OF NAPA COUNTY, CALIF.: CJMG, V. 44, P. 176-183}{Production:: USBM DATA}
ReporterPeterson, Jocelyn A.