Mine detail: East Mayacmas District Report

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Location: Lake, Napa County, California, United States, North America
Lat / long: 38.19989, -122.30105
dep_id: 60000983
mrds_id: M055652
Commodity type: metallic
Major mineral: Mercury
Minor mineral: Chromium
Trace mineral: Manganese, Copper
Operation type: Unknown
Deposit type: DISSEMINATED, VEINS, STOCKWORKS
Production size: Medium ammount of material produced
Development status: Producer
alteration: KAOLINIZATION SEDIMENTS, SILICA CARBONATE ALTERATION OF SERPENTINE
conc_proc: OPEN SPACE FILLING AND REPLACEMENT BY HYDROTHERMAL SOLUTIONS
ore_ctrl: MINOR LOCAL FAULTS, GOUGE ZONES, CHANGES IN ATTITUDE
Structure: LOCAL FAULTS TRENDING NW, LITHOLOGIC CONTACTS, NW TRENDING ANTICLINE (MAYACMAS ANTICLINE)
Year first produced: 1864
dy_ba: >
disc_yr: 1850
References:
  • 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
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