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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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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Ownership information
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

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

Site location context

Political divisions (FIPS codes)

San Diego(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Julian(quadrangle 1:24,000 scale)

Borrego Valley(quadrangle 1:100,000 scale)

Santa Ana(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Salton Sea(hydrologic accounting unit)

Southern Mojave-Salton Sea(hydrologic subregion)

California(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management CA)

Bureau of Land Management CA BLM(Type of land area)

BLM(Federal land areas administered by BLM)

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 Critical Primary
Nickel Critical Primary
Palladium Critical Tertiary
Platinum Critical Tertiary
Iridium Critical 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

Economic information

Ore body information

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

Comments on the geologic information

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

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

Bibliographic references

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

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

Maps centered on this site

Authoritative California resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.