Mine detail: St. Johns Mine

Previously called 'St. Johns Quicksilver MineVallejoSt. John Mine.'

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Location

Lat / long:

38.15184, -122.19272

Resource(M)

Primary:	Mercury
Ore:	Cinnabar
Gangue:	Quartz
Orebody form:	TABULAR
Discovery year:	1852

Production

Operation type:	Unknown
Production size:	Medium
Development status:	Past Producer
Production years:	1873-1880, 1902-1908, 1914-1920, 1923, 1930, 1935-1940, 1942
First production started:	1873

Geology

Host type:	Serpentinite,Sandstone,Andesite
Structure:	Prominent N-S Fracture System In The Sandstone, Thrust Fault
Alteration processes:	Silica - Carbonate From Serpentine And Andesite

References

MRDS	M055491
DEP	10040639
Reference	{Deposit:: BAILEY, E. H., USGS, PERSONAL FILES}{Deposit:: HOLMES, G. W., JR., 1965, MERCURY IN CALIFORNIA: IN USBM IC 8252.}{Deposit:: BRADLEY, W. W., 1918, QUICKSILVER RESOURCES OF CALIFORNIA: CDMG BULL. 78.}{Deposit:: AUBURY, L. E., 1903, THE QUICKSILVER RESOURCES OF CALIFORNIA: CDMG BULL. 27.}{Production:: USBM DATA}
Reporter	Gassaway, J. S.