Friday Mine

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

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.

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.