The Friday Mine is a cobalt, copper, and nickel mine located in San Diego county, California at an elevation of 4,619 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: 4,619 Feet (1,408 Meters)
Commodity: Cobalt, Copper, Nickel
Lat, Long: 33.03917, -116.56417
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.
Friday Mine MRDS details
Site Name
Primary: Friday Mine
Commodity
Primary: Cobalt
Primary: Copper
Primary: Nickel
Tertiary: Iridium
Tertiary: Palladium
Tertiary: Platinum
Location
State: California
County: San Diego
District: Julian District
Land Status
Land ownership: National Forest
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
Not available
Ownership
Owner Name: Jerome Jackson
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Year: 1885
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Lower California
Mineral Deposit Model
Model Name: Synorogenic-synvolcanic Ni-Cu
Orebody
Form: MASSIVE BODIES AND DISSEMINATED
Structure
Not available
Alterations
Not available
Rocks
Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous
Name: Diorite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Cretaceous
Analytical Data
Analytical Data: AVERAGE ASSAY FROM OXIDIZED AND UNOXIDIZED ROCK IS 2% NI. SULFIDE ORE AVERAGES 2.5-3% NI, 0.5-1% CU, AND ABOUT 0.15% CO. 310 PPB PD, 90 PPB PT, 80 PPB IR (MAX.) IN MASSIVE SULFIDE SAMPLES
Materials
Ore: Pentlandite
Ore: Pyrite
Ore: Chalcopyrite
Ore: Magnetite
Ore: Pyrrhotite
Comments
Comment (Reserve-Resource): UNPUB. REPORT GIVES 30,000 LB. CO IN 10,000 TONS OF ORE, WITH 2.5% NI, 0.6% CU, 0.015% CO. CORNWALL (1966) INDICATED A SULFIDE DEPOSIT OF <10,000 TONS OF CONTAINED NI
Comment (Development): 5 DDH IN 1946 AND 10 DDH IN 1957. DRILLING DID NOT SHOW ENOUGH OF INTEREST TO WARRANT CONTINUED EXPLORATION
Comment (Deposit): GABBRO AND PERIDOTITE AT MARGINS OF COMPLEX HOST ORE. ORE BODY IS IRREGULAR WEDGE SHAPED AND OXIDIZED TO 132 FT LEVEL.
Comment (Workings): 2 SHAFTS. WORKINGS WERE DEVELOPED PRIOR TO 1924
Comment (Location): IN THE ROLLING UPLANDS OF THE CUYAMACA MOUNTAINS OF EASTERN SAN DIEGO. MINE IS ADJACENT TO STATE HIGHWAY 79
Comment (Geology): MINERALIZED AREA ALSO CONTAINS TOURMALINE-BEARING PEGMATITE DIKE AND LAMPROPHYRE DIKE.
Comment (Deposit): ORIGINALLY OPENED AS A GOLD MINE ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT
Comment (Deposit): Discovery Year: 1880'S
References
Reference (Deposit): ERIC, J.H., 1948, TABULATION OF COPPER DEPOSITS OF CALIFORNIA: CALIFORNIA DIVISION OF MINES AND GEOLOGY BULLETIN 144, P. 320.
Reference (Deposit): CHESTERMAN, C.W., 1976, WRITTEN COMMUNICATION
Reference (Deposit): PGE DATA FROM RETRIEVAL OF U.S. GEOLOGICAL SURVEY GEOCHEMICAL FILES
Reference (Reserve-Resource): CORNWALL
Reference (Deposit): CREASEY, S.C., 1946, GEOLOGY AND NICKEL MINERALIZATION OF THE JULIAN-CUYAMACA AREA, SAN DIEGO COUNTY, CALIFORNIA: CALIFORNIA JOURNAL OF MINES AND GEOLOGY, V. 42, NO. 1, P. 15-29.
Reference (Deposit): CORNWALL, H.R., 1966, NICKEL DEPOSITS OF NORTH AMERICA: U.S. GEOLOGICAL SURVEY BULLETIN 1223, P. 40, MAP P. 10-11
Reference (Deposit): BILBREY, J.H., JR., 1962, COBALT, A MATERIALS SURVEY: U.S. BUREAU OF MINES INFORMATION CIRCULAR 8103, P. 28.
Reference (Deposit): MERRIAM, RICHARD, 1946, IGNEOUS AND METAMORPHIC ROCKS OF THE SOUTHWESTERN PART OF THE RAMONA QUADRANGLE, SAN DIEGO COUNTY, CALIFORNIA: GEOLOGICAL SOCIETY OF AMERICA BULLETIN, V. 57, P. 223-260.
Reference (Deposit): WEBER, F.H., JR., 1963, GEOLOGY AND MINERAL RESOURCES OF SAN DIEGO COUNTY, CALIFORNIA: CALIFORNIA DIVISION OF MINES AND GEOLOGY COUNTY REPORT 3, P. 198-199.
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.
