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Friday Mine

Occurrence in San Diego county in California, United States with commodities Copper, Cobalt, Nickel, Palladium, Platinum, Iridium
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Geologic information

Identification information

Deposit ID 10067592
MRDS ID W000377
Record type Site
Current site name Friday Mine

Geographic coordinates

Geographic coordinates: -116.56501, 33.03923 (WGS84)
Elevation 1408
Relative position ABOUT 4 MI SOUTH OF JULIAN
(click for info)

Geographic areas

Country State County
United States California San Diego

Public Land Survey System information

Meridian Township Range Section Fraction State
San Bernardino 013S 004E 15 SW4 California

Comments on the location information

  • IN THE ROLLING UPLANDS OF THE CUYAMACA MOUNTAINS OF EASTERN SAN DIEGO. MINE IS ADJACENT TO STATE HIGHWAY 79

Commodities

Commodity Importance
Copper Primary
Cobalt Primary
Nickel Primary
Palladium Tertiary
Platinum Tertiary
Iridium Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Magnetite Ore
Pentlandite Ore
Pyrite Ore
Pyrrhotite Ore

Analytical data

Result 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

Mineral occurrence model information

Model code 13
USGS model code 7a
Deposit model name Synorogenic-synvolcanic Ni-Cu
Mark3 model number 19

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Stonewall Quartz Diorite
    Rock description Stonewall Quartz Diorite
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Metamorphic Rock > Schist
    Rock unit name San Marcos Gabbro (Cuyamaca Gabbro);
    Rock description San Marcos Gabbro (Cuyamaca Gabbro);

Nearby scientific data

(1) -116.56501, 33.03923
ListMap

Ore body information

  • General form MASSIVE BODIES AND DISSEMINATED
    Strike N75E
    Dip STEEPLY NW
    Thickness 7.62M
    Width 14.63M
    Length 16.76M

Comments on the geologic information

  • MINERALIZED AREA ALSO CONTAINS TOURMALINE-BEARING PEGMATITE DIKE AND LAMPROPHYRE DIKE.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1885

Mining district

District name Julian District

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner Jerome Jackson

Comments on the reserve resource information

  • 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

Comments on the workings information

  • 2 SHAFTS. WORKINGS WERE DEVELOPED PRIOR TO 1924

Comments on development

  • 5 DDH IN 1946 AND 10 DDH IN 1957. DRILLING DID NOT SHOW ENOUGH OF INTEREST TO WARRANT CONTINUED EXPLORATION

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS W000377

Bibliographic references

  • 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.

  • Deposit

    CORNWALL, H.R., 1966, NICKEL DEPOSITS OF NORTH AMERICA: U.S. GEOLOGICAL SURVEY BULLETIN 1223, P. 40, MAP P. 10-11

  • Deposit

    BILBREY, J.H., JR., 1962, COBALT, A MATERIALS SURVEY: U.S. BUREAU OF MINES INFORMATION CIRCULAR 8103, P. 28.

  • 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.

  • 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.

  • Deposit

    ERIC, J.H., 1948, TABULATION OF COPPER DEPOSITS OF CALIFORNIA: CALIFORNIA DIVISION OF MINES AND GEOLOGY BULLETIN 144, P. 320.

  • Deposit

    CHESTERMAN, C.W., 1976, WRITTEN COMMUNICATION

  • Deposit

    PGE DATA FROM RETRIEVAL OF U.S. GEOLOGICAL SURVEY GEOCHEMICAL FILES

  • Reserve-Resource

    CORNWALL

General comments

Subject category Comment text
Deposit Discovery Year: 1880'S
Deposit GABBRO AND PERIDOTITE AT MARGINS OF COMPLEX HOST ORE. ORE BODY IS IRREGULAR WEDGE SHAPED AND OXIDIZED TO 132 FT LEVEL.
Deposit ORIGINALLY OPENED AS A GOLD MINE ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1972 Coury, Anny B. U.S. Geological Survey
Updater 01-MAR-1978 Killman, K. (Albers, J.) U.S. Geological Survey
Updater 01-JAN-1979 Peterson, Jocelyn A. U.S. Geological Survey