The Duncan is a gold mine located in Mariposa county, California at an elevation of 925 feet.
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
Elevation: 925 Feet (282 Meters)
Commodity: Gold
Lat, Long: 37.49083, -120.21583
Map: View on Google Maps
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.
Duncan MRDS details
Site Name
Primary: Duncan
Secondary: Lost Douglas
Commodity
Primary: Gold
Secondary: Silver
Location
State: California
County: Mariposa
Land Status
Not available
Holdings
Not available
Workings
Type: Surface/Underground
Ownership
Owner Name: George D. Turner
Production
Year: 1935
Time Period: - 1935
Material type: ORE
Description: Cp_Grade: ^.08 Oz/Ton Au .04 Oz/Ton Ag
Year: 1927
Material type: AU
Description: Ap_Grade: ^ .14 Oz/Ton Ag
Year: 1927
Material type: ORE
Description: Ap_Grade: ^.45 Oz/Ton Au
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1870
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Pacific Border Province
Physiographic Section: California Trough
Mineral Deposit Model
Not available
Orebody
Form: PINCH & SWELL
Structure
Not available
Alterations
Not available
Rocks
Name: Hornfels
Role: Host
Age Type: Host Rock
Age Young: Late Jurassic
Analytical Data
Not available
Materials
Ore: Gold
Ore: Silver
Ore: Pyrite
Comments
Comment (Commodity): LAST ORE MILLED WAS OF MARGINAL GRADE.
Comment (Location): SHORT DISTANCE W OF COMMON 1/4 COR. ON MT. BULLIAN R
Comment (Production): PRODUCTION RECORDS INCOMPLETE. IN 1897- 98, 246 OZ. OF GOLD RECOVERED FROM UNKNOWN QUANTITY OF ORE; IN 1927, 500 TONS OF ORE YIELDED 219.82 OZ. GOLD AND 70 OZ. SILVER. FROM 1932-1935, 1146 TONS OF ORE YIELDED 90 OZ. GOLD AND 45 OZ. SILVER. IDLE SINCE LATE 1930'S AND NO EQUIPMENT ON PROPERTY.
Comment (Deposit): VEIN, POCKETS, ORE SHOOTS
Comment (Workings): SERIES OF OPEN PITS AND CAVED SHAFTS STRUNG OUT ALONG THE VEIN FOR NEARLY 1/2 MILE. MAIN SHAFT 325' IN 1935.
Comment (Geology): GEOL.DESC: VEIN MEASURED AT SURFACE, 2 - 5 FT. ACROSS. WALL ROCKS ARE SCHISTOSE GREENSTONE, QUARTZ BIOTITE SCHIST AND QUARTZ BIOTITE HORNFELS.
Comment (Deposit): ONE PATENTED CLAIM. MINE IS NOTED FOR ITS POCKETY CHARACTER.
References
Reference (Deposit): BOWEN, O. E., JR., & GRAY, H., JR., 1957 , MINES AND MINERAL DEPOSITS OF MARIPOSA COUNTY, CALIF.: CALIF. JOUR. MINES & GEOL., VOL. 53 , NOS. 1 & 2 , P. 96 , 256 .
Reference (Deposit): LAIZURE, C. MCK., 1928 , S. F. FIELD DIV. - MARIPOSA COUNTY: 24TH REPORT STATE MINERALOGIST, VOL. 24 , NO. 2 , P. 85 .
Reference (Production): BOWEN AND GRAY, 1957
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.
