The Oro Y Plata is a gold mine located in Calaveras county, California.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
Satelite View
MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
Oro Y Plata MRDS details
Site Name
Primary: Oro Y Plata
Secondary: Blue Wing
Secondary: Red Wing Willard
Secondary: Silver Star
Secondary: Oro-Plata Ext.
Secondary: Pay Rock
Commodity
Primary: Gold
Secondary: Silver
Secondary: Copper
Secondary: Lead
Tertiary: Tin
Tertiary: Zinc
Tertiary: Mercury
Location
State: California
County: Calaveras
Land Status
Not available
Holdings
Not available
Workings
Type: Surface/Underground
Ownership
Owner Name: Mary Bess Norton
Years: 1962 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada
Mineral Deposit Model
Not available
Orebody
Name: PAY ROCK VEIN
Name: WHITE WING
Name: BLUE WING NORTH BRANCH VEIN
Name: BLUE WING WEST ORE SHOOT
Name: BLUE WING EAST ORE SHOOT
Name: ORO PLATA
Name: RED WING
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Mineralization Of Network Of Igneus Rx.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Gold
Ore: Stibnite
Ore: Cinnabar
Gangue: Quartz
Gangue: Dolomite
Comments
Comment (Commodity): MOSTLY LOW GRADE AU ORE ORE ON N SIDE OF HILL, PAY ROCK & ORO PLATA VEINS, CONSISTS MAINLY OF GALENA, W AG - AU RATIO OF 6 : 1 ; WHILE ORE FROM S SIDE OF HILL, BLUE WING, HAS TETRAHEDRITE W NO GALENA & AG - AU RATIO OF 1 : 1 . OCCASIONAL BUNCHS OF STIBNITE OBSERVED. W SMALL VALUES OF AU & AG.
Comment (Production): AT 1888 CLOSING, ORE WAS MOSTLY LOW GRADE. ORE VARIES FROM .25 - 1.10 OZ/TON AU.
Comment (Workings): OPEN CUTS, ADITS, GLORY HOLE, & NUMBER OF SHAFTS INCLUDING 286 & 317 FT SHAFTS, DRIFTS.
Comment (Deposit): IN 1962 ADIT FOR TOURIST ATTRACTION WAS BEING DEVELOPED - CLARK, 1962 ; INFO.SRC : 1 PUB LIT
Comment (Deposit): VEINS. PRINCIPAL VEINS ARE RED WING, ORO PLATA, BLUE WING AND WHITE WING ON THE CONTACT BETWEEN SEVERAL NW TRENDING DIORITE BODIES IN LS. RED WING VEIN STRIKES N 85 W, DIPS N & MAY BE MINERALIZED DIKE, 100 FT THICK W LENSES OF QZ & IGN RX INTERSPERSED W GOUGE. THE ORO PLATA VEIN, N OF RED WING, BETWEEN DIKE ROCK AND LS, STRIKE N 85 W, VERT DIP. BLUE WING VEIN TO S, BRANCHS FROM RED WING, W LS WALLS, STRIKES N 75 E & DIPS 75 SE, AND HAS TWO ORE SHOOTS - E IS 8 - 10 FT THICK, WIDTH 75 FT; W IS 2.5 FT THICK, 160 FT WIDE. NORTH BRANCH OF BLUE WING STRIKES N 85 W W VERT OR SLIGHT NE DIP & PARALLELS RED WING. TWO PARALLEL PAY ROCK VEINS OCCUR IN LS N. OF RED WING, STRIKING N 78 W, DIPPING SW, 2 FT THICK. WHITE WING, SOUTH OF BLUE WING, STRIKES N 85 W, DIPS 54 NE.
Comment (Geology): LENSES OF RECRYSTALLIZED LS AND DOLOMITE.
References
Reference (Deposit): GOODWIN, J. G., 1957 , LEAD AND ZINC IN CALIF.: CALIF. DIV. MINES. VOL. 53 , NOS. 3 & 4 , P 434
Reference (Production): LOGAN, 1936 ; CLARK, 1962
Reference (Deposit): CLARK, W. B., & LYDON, P. A., 1962 , MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIF.: CALIF. DIV. MINES & GEOL., COUNTY REPORT 2 , P. 172 , 65
Reference (Deposit): LOGAN, C. A., FRANKE, H., 1936 , MINES AND MINERAL RESOURCES OF CALAVERAS CO.: CDM CALIF. JOUR. MINES & GEOL., VOL. 32 , NO. 3 , P. 278 , 279 , 315
California Gold
"Where to Find Gold in California" looks at the density of modern placer mining claims along with historical gold mining locations and mining district descriptions to determine areas of high gold discovery potential in California. Read more: Where to Find Gold in California.
