Mine detail: Keystone Union

Previously called 'Calaveras Copper'

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Location

Lat / long: 37.98431, -120.64771

Resource(M)

Tertiary: Copper, Gold, Lead, Silver

Production

Operation type: Underground
Development status: Past Producer

Geology

References

MRDSM006028
MAS60090349
DEP10235156
Reference{Deposit:: REF 1 CALIF.DIV.OF MINES, COPPER IN CALIF, BULL.144, CALIF.}{Deposit:: NAT.RES.,1948. INCLUDES PLATES OF MINE MAPS, REFERENC}{Deposit:: 3 & 4,P 427;EC MINERAL MAP NO 7,1957;COUNTY REPT NO 2,P 24-2}{Deposit:: REF 2 LYMAN MOORE DATA FROM 1970 EVALUATION}{Deposit:: ED,SEPT 1,1944,P 26;CALIF B 176,P 170,171 & 174}{Deposit:: REF 3 CALIF.DIV.OF MINES AND GEOLOGY, MINES AND MINERAL RES}{Deposit:: OF CALIVERAS COUNTY,CALIF., COUNTY REPORT NO.2, 196}
ReporterLewis, J.D.