Mine detail: Twin Peaks

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Location: Napa County, California, United States, North America
Lat / long: 38.66238, -122.53496
dep_id: 10040802
mrds_id: M055676
Commodity type: metallic
Major mineral: Mercury
Trace mineral: Chromium
Operation type: Unknown
Production size: Small ammount of material produced
Development status: Past Producer
ore: Chromite, Cinnabar
gangue: Saponite
work_type: Underground
alteration: Silica Carbonate Alteration Of Serpentine
conc_proc: Hydrothermal Solutions
ore_ctrl: Contact
Reporter: Peterson, Jocelyn A.
hrock_type: Serpentinite
Structure: Serpentine - Sandstone Contact
Year first produced: 1902
prod_yrs: 1902, 1904, 1907 - 1908, 1911, 1915 - 1916, 1918, 1940 - 1943
References:
  • 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
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