Mine detail: Keystone

Previously called 'Big Avalanche Group'

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Location

Lat / long: 39.54961, -120.54881

Resource(M)

Primary: Gold
Ore: Gold
Gangue: Quartz

Production

Operation type: Unknown
Production size: Small
Development status: Past Producer

Geology

Host type:Slate

References

MRDSM021697
DEP10034786
Reference{Deposit:: AVERILL, C. V., 1942 , MINES AND MINERAL RESOURCES OF SIERRA CO.: CDM CALIF. JOUR. MINES AND GEOL., VOL. 38 , NO. 1 , P. 58 .}{Deposit:: LOGAN, C. A., 1929 , SIERRA CO.: CDMM 25TH REPORT STATE MINERALOGIST, APRIL, P. 179 .}{Deposit:: MCCULLOCH, W. C., ETAL, 1964 , MINERALS FOR INDUSTRY, N CALIF.: SO PACIFIC CO., VOL. 2 , P. 54 .}{Deposit:: MACBOYLE, E., 1920 , MINES AND MINERAL RESOURCES SIERRA CO.: CSMB 16TH REPORT STATE MINERALOGIST, DEC. 1918 , P 98 .}{Production:: MACBOYLE, 1920}
ReporterHayden, F. (Albers, J.)