The Marposa is a gold mine located in Mariposa county, California at an elevation of 2,073 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: 2,073 Feet (632 Meters)
Commodity: Gold
Lat, Long: 37.48889, -119.95750
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.
Marposa MRDS details
Site Name
Primary: Marposa
Commodity
Primary: Gold
Location
State: California
County: Mariposa
District: Mariposa
Land Status
Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Holdings
Not available
Workings
Type: Underground
Ownership
Owner Name: Mrs. Frank E. Gallagher
Owner Name: George Adams
Years: 1957 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1849
Years of Production:
Organization:
Significant: Y
Deposit Size: M
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrite
Ore: Gold
Gangue: Quartz
Comments
Comment (Workings): WORKINGS INCLUDE OLD UNUSABLE SHAFT 475 FT. DEEP, THREE COMPARTMENT MAIN SHAFT 1550 FT. DEEP WITH 8 LEVELS & 5757 FT. OF DRIFTS. MOST OF THE ORE HAS BEEN STOPED OUT ABOVE THE 800 FT. LEVEL AND THERE ARE A NUMBER OF RAISES AND CROSSCUTS AS WELL AS A DRAINAGE TUNNEL.
Comment (Geology): GEOL.DESC: EAST OF THE MAIN SHAFT THE MARIPOSA VEIN STRIKES N 70 W, AND DIPS 60 - 70 SW. BETWEEN THE MAIN AND OLD SHAFTS THE VEIN BRANCHES WITH ONE BRANCH STRIKING OFF AT N 50 W. VEIN WIDTHS VARY FROM 2 - 5 FT. WIDE EAST OF THE JUNCTION LINE OF THE TWO BRANCHES. THE BRANCHES DO NOT AVERAGE MORE THAN TWO FEET WIDE. VEIN MATTER IS MILKY QUARTZ, COMMONLY RIBBONED TOWARD THE BORDERS BY THIN INCLUSIONS OF WALL ROCK.
Comment (Production): GRADE OF ORE FELL FROM $25 IN 1864 TO $10 - 11/TON IN 1870 . 1927 STATE HIWAY COMMISSION PRODUCED 35,000 TONS AT CRUSHED ROCK OF UNANNOUNCED VALUE FROM MARIPOSA DUMPS. 1927 - 1932 LESSEES WORKED THE EXTENSION OF THE MARIPOSA VEIN, TAKING OUT ABOUT 1500 TONS OF LOW GRADE ORE & SEVERAL SMALL HIGH-GRADE POCKETS.
Comment (Deposit): VEIN
Comment (Deposit): Discovery Year: SPRING, 1849
Comment (Deposit): DISCOVERY CREDITED TO KIT CARSON AND TWO ASSOCIATES. LAND WAS INCLUDED IN LAS MARIPOSAS GRANT OWNED BY J. C. FREMONT. VEIN MATTER IS MILKY QUARTZ, COMMONLY RIBBONED TOWARD THE BORDERS BY THIN INCLUSIONS OF WALL ROCK, WITH NATIVE GOLD, PYRITE AND ARSENOPYRITE; HIGH -GRADE POCKETS NEARLY ALWAYS CONTAIN ARSENOPYRITE, TWO POCKETS ARE REPORTED TO HAVE YIELDED $30,000 AND $15,000. ACTIVE IN 1955 . POSSIBLY STILL ACTIVE.
References
Reference (Deposit): LOGAN, C. A., 1935 , THE MOTHER LODE BELT OF CALIFORNIA: CALIFORNIA DIVISION OF MINES BULLETIN 108 , P. 184 - 185 .
Reference (Deposit): 5) LAIZURE, C. MCK., 1928 , SAN FRANCISCO FIELD DIVISION IN TWENTY-FOURTH REPORT OF THE STATE MINERALOGIST: CALIFORNIA STATE MINING BUREAU, P. 99 - 100 .
Reference (Production): BOWEN & GRAY 1957
Reference (Deposit): BOWEN, O. E., JR., GRAY, C. H., JR., 1957 , MINES AND MINERAL DEPOSITS OF MARIPOSA COUNTY, CALIFORNIA: CALIF. JOUR. MINES AND GEOLOGY, V. 53 , NOS. 1 AND 2 , P. 128 - 130 , 281 .
Reference (Deposit): CASTELLO, W. O., 1921 , MINES AND MINERAL RESOURCES OF MARIPOSA COUNTY IN SEVENTEENTH REPORT OF THE STATE GEOLOGIST: CALIFORNIA STATE MINING BUREAU, P. 124 .
Reference (Deposit): AUBURY, L. E., 1904 , REGISTER OF MINES AND MINERALS, MARIPOSA COUNTY CALIFORNIA: CALIFORNIA STATE MINING BUREAU, P.
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.
