Mine detail: Esperanza

Previously called 'Bright Hope'

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Location

Lat / long: 38.80599, -122.8433

Resource(M)

Primary: Mercury
Ore: Cinnabar, Mercury
Gangue: Quartz
Discovery year: 1917

Production

Operation type: Unknown
Production size: Small
Development status: Producer
Production years: 1917 - 1918, 1931 - 1936, 1938, 1940 - 1941, 1947

Geology

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

References

MRDSM055704
DEP10040829
Reference{Deposit:: HOLMES, G. W., JR., 1965, MERCURY IN CALIFORNIA: IN USBM IC 8252}{Deposit:: BAILEY, E. H., USGS, PERSONAL FILES}{Deposit:: BAILEY, E. H., 1946, QUICKSILVER DEPOSITS OF THE WESTERN MAYACMAS DISTRICT, SONOMA COUNTY, CALIFORNIA: CALIF. JOUR. OF MINES AND GEOLOGY, V. 42, P. 199 - 230}{Deposit:: BRADLEY, W. W., 1918, QUICKSILVER RESOURCES OF CALIFORNIA: CALIF. STATE MIN. BUREAU BULL. 78, 389 P.}{Deposit:: 5) HONKE, M.T., JR. AND VER PLANCK, W.E., JR., 1950, MINES AND MINERAL RESOURCES OF SONOMA COUNTY, CALIF.: CJMG, V. 46, P. 98-105}{Deposit:: 6) RANSOME, A.L. AND KELLOGG, J.L., 1939, QUICKSILVER RESOURCES OF CALIFORNIA: CJMG, V. 35, P. 353-486}{Production:: USBM DATA}
ReporterPeterson, Jocelyn A.