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Number Fire Group

Past Producer in Stanislaus county in California, United States with commodity Chromium
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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. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Ownership information
  17. Production statistics
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10043425
MRDS ID M100180
Record type Site
Current site name Number Fire Group

Geographic coordinates

Geographic coordinates: -121.40769, 37.41103 (WGS84)
Elevation 427
Relative position 22 MILES EAST OF PATTERSON, CA.

Site location context

Political divisions (FIPS codes)

Stanislaus(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mount Boardman(quadrangle 1:24,000 scale)

San Jose(quadrangle 1:100,000 scale)

San Jose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Panoche-San Luis Reservoir(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Stanislaus

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 006S 005E 15 California

Comments on the location information

  • LOCATED APPROX. 300 M EAST OF JUNCTION OF ADOBE AND DEL PUERTA CANYONS

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Alteration

  • (Local) Serpentinization Of Dunite

Analytical data

Result GRAB SAMPLE: CRUDE ORE 53% CR2O3
Result CONCENTRATES: 57.62% CR2O3
Result 16.36% FE
Result CR/FE 2.41

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite
    Stratigraphic age (youngest) Late Jurassic
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite
    Rock unit name Franciscan
    Rock description Franciscan

Economic information

Ore body information

  • General form POD, IRREGULAR
    Strike EAST
    Dip NORTH
    Length 60.96M
    Width 21.34M

Controls for ore emplacement

  • Shear Zone

Comments on the geologic information

  • CHROMITE DEPOSITS OCCUR IN AN ULTRAMAFIC BODY THAT TRENDS N 70 W, IS 8 MILES LONG AND 1.5 MILES WIDE. THE ULTRAMAFIC BODY IS INTRUSIVE INTO THE UPPER PART OF EXPOSED FRANCISCAN SECTION.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1918
Year of last production 1945

Mining district

District name Del Puerto Area

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner West Coast Chrome Co.
    First year 1940
  • Type Owner
    Owner Higuera, Larry
    Home office P.O. Box 1147, Patterson, Ca. 95363 (209) 892-5592
    First year 1975

Production statistics

  • Year 1940
    Period 1918-1940'S
    Material CON
    Accuracy Estimate
    Description Cp_Grade: ^51% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 51wt-pct

Comments on the workings information

  • DEPOSIT MINED BY BOTH OPEN CUT, TUNNELS AND STOPES. BLOCK OF GRANDCONTAINING THE MAIN WORKINGS OF NO. 5 GROUP HAS SLID INTO THE CANYON.

Reference information

Bibliographic references

  • Deposit

    WALKER, G.W. AND GRIGGS, A.B., 1953, GEOL. INVESTIGATIONS OF CHROMITE IN CALIF.: CDMG BULL 134, PART II, CHAPT. 2, P. 76.

  • Deposit

    STINSON, M.C., 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED.

  • Production

    CDMG MINERAL PROPERTY REPORT, UNPUBLISHED

General comments

Subject category Comment text
Deposit HIGH GRADE ORE FORMED A LEDGE; BELOW IT WAS A DISSEMINATED ORE ZONE

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1981 Oster, Karel L. (Albers, John P.) 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.