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Old Ironsides Prospect

Occurrence in San Diego county in California, United States with commodities Nickel, Copper, Cobalt
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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. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Land status
  13. Ownership information
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10067591
MRDS ID W000376
Record type Site
Current site name Old Ironsides Prospect
Related records 10189611

Geographic coordinates

Geographic coordinates: -116.81974, 33.15894 (WGS84)
Elevation 975
Relative position ADJACENT TO THE BLACK MTN. TRUCK TRAIL, ON W. SLOPE OF BLACK MTN, CLEVELAND NATIONAL FOREST. ABOUT 7 MI. TO MESA GRANDE VIA GRADED AND UNGRADED DIRT ROADS.

Site location context

Political divisions (FIPS codes)

San Diego(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mesa Grande(quadrangle 1:24,000 scale)

Borrego Valley(quadrangle 1:100,000 scale)

Santa Ana(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

San Diego(hydrologic unit)

Laguna-San Diego Coastal(hydrologic accounting unit)

Southern California Coastal(hydrologic subregion)

California(hydrologic region)

Federal lands

Cleveland National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States California San Diego

Public Land Survey System information

Meridian Township Range Section Fraction State
San Bernardino 012S 002E 06 California

Comments on the location information

  • LOCATED IN NW 1/4 , SW 1/4 , SECTION 6

Commodities

Commodity Importance
Nickel Critical Tertiary
Copper Tertiary
Cobalt Critical Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrrhotite Ore
Hornblende Gangue
Olivine Gangue
Pyrite Gangue

Analytical data

Result SAMPLES OF UNALTERED GABBRO, FROM DEPTH OF 160 FT FROM DIAMOND DRILL HOLE ASSAYED 0.77 PERCENT NICKEL, 1.46 PERCENT COPPER. GOSSAN FROM TRENCHES ASSAYED 0.11 TO 0.45 PERCENT NICKEL, 0.007 TO 0.35 PERCENT COBALT
Result AND 0.27 TO 0.65 PERCENT COPPER. SURFACE GOSSAN SAMPLES AVERAGE 0.5 PERCENT NICKEL.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro

Nearby scientific data

(1) -116.81974, 33.15894
ListMap

Economic information

Ore body information

  • Length 99.06M
    Width 15.24M
    Depth to bottom 18.29M

Comments on the geologic information

  • GEOL.DESC: AREA UNDERLAIN BY GABBRO (SAN MARCOS OR CUYAMACA) UPON WHICH HAS DEVELOPED DARK BROWN GOSSAN THAT CROPS OUT OVER AREA 325 FT. LONG, AND ABOUT 50 FT. WIDE. EXPLORATION INDICATES DEPTH OF 60 FT,BELOW WHICH IS UNALTERED GABBRO. NICKEL AND COPPER-BEARING SULFIDES OCCUR SPARINGLY IN UNALTERED GABBRO, AND SEEM MORE PROMINENT IN GOSSAN. UNALTERED GABBRO CONTAINS PYRRHOTITE AND CHALCOPYRITE. GABBRO INTRUDED INTO LARGER QUARTZ DIORITE BODY.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner Valle, Howard And Paul
    Home office 2424 - 5th Avenue, San Diego, CA

Comments on the reserve resource information

  • SMALL TONNAGE OF MATERIAL INFERRED TO BE PRESENT IN DEPOSIT TO A DEPTH OF 100 FT.

Reference information

Bibliographic references

  • Deposit

    CORNWALL, H. R., 1966, USGS BULL. 1223, P. 41.

  • Deposit

    WEBER, F.H., JR., 1963 , GEOLOGY AND MINERAL RESOURCES OF SAN DIEGO COUNTY, CALIF: CALIF. D.O.M. AND GEOL., COUNTY REPT. 3

  • Deposit

    CHESTERMAN, C.W., 1976 , WRITTEN COMMUNICATION

  • Reserve-Resource

    REFER. (1)

General comments

Subject category Comment text
Deposit DEPOSIT EXPLORED IN 1954 UNDER DMEA CONTRACT BY TWO DIAMOND-DRILL HOLES, EACH 300 FT. DEEP.

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

Beyond USGS

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

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.