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Lucky Girl Mine

Past Producer in Stanislaus county in California, United States with commodities Chromium, Platinum, Palladium, Iridium, Ruthenium, Rhodium
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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. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Controls for ore emplacement
  15. Economic information about the deposit and operations
  16. Mining district
  17. Land status
  18. Ownership information
  19. Production statistics
  20. Links to other databases
  21. Bibliographic references
  22. General comments
  23. Reporter information

Geologic information

Identification information

Deposit ID 10043424
MRDS ID M100179
Record type Site
Current site name Lucky Girl Mine

Geographic coordinates

Geographic coordinates: -121.42046, 37.40214 (WGS84)
Elevation 658
Relative position ABOUT 30 MI EAST-NORTHEAST OF SAN JOSE

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)

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 Stanislaus

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 006S 005E 22 NEAR CENTER OF NW4 California

Comments on the location information

  • ON NORTH SIDE OF PEACHTREE CREEK. LOCATION GIVEN IS FOR PROSPECT SYMBOL SHOWN ON TOPO MAP

Commodities

Commodity Importance
Chromium Critical Primary
Platinum Critical Tertiary
Palladium Critical Tertiary
Iridium Critical Tertiary
Ruthenium Critical Tertiary
Rhodium Critical Tertiary

Materials information

Materials Type of material
Chromite Ore
Olivine Gangue
Serpentine Gangue

Alteration

  • (Local) Ultramafic Rocks Serpentinized

Analytical data

Result 1 PGE ANALYSIS: PT=61 PPB
Result PD=13 PPB
Result IR=730 PPB
Result RU=510 PPB
Result RH=19 PPB.

Mineral occurrence model information

Model code 15
USGS model code 8a
Deposit model name Podiform chromite (minor)
Mark3 model number none

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic
  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite
    Rock unit name Coast Range (Del Puerto) Ophiolite
    Rock description Coast Range (Del Puerto) Ophiolite
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite
    Rock unit name Franciscan Formation
    Rock description Franciscan Formation

Nearby scientific data

(1) Franciscan melange
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Shear Zone Trending N80e

Ore body information

  • General form LENSES, PODS OF GRANULAR AND MASSIVE CHROMITE TO 2 FT THICK
    Length 152.4M
    Width 0.61M

Controls for ore emplacement

  • Magmatic Segregation

Comments on the geologic information

  • A SEPTUM OF DUNITE LIES BETWEEN PERIDOTITE AND FRANCISCAN FORMATION

Economic information about the deposit and operations

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

Mining district

District name Del Puerto Area

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner West Coast Chrome Co.
    First year 1941

Production statistics

  • Year 1918
    Period 1918-?
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^42% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 42wt-pct

Comments on the workings information

  • OPEN CUTS AND SHORT ADITS

Reference information

Bibliographic references

  • Deposit

    WALKER, G.W., AND GRIGGS, A.B., 1953, GEOLOGICAL INVESTIGATIONS OF CHROMITE IN CALIFORNIA: CALIFORNIA DIVISION OF MINES BULLETIN 134, PT. 2, CH. 2, P. 74, 76, 88.

  • Deposit

    CARLSON, C.A., AND OTHERS, 1985, ANALYSES FOR PLATINUM-GROUP ELEMENTS IN SAMPLES FROM PODIFORM CHROMITE DEPOSITS, CALIFORNIA AND OREGON: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 85-442, 14 P.

General comments

Subject category Comment text
Deposit CHROMITE IS GRANULAR AND MASSIVE AND LENSES ARE UP TO 2 FT THICK. THE DUNITE LIES BETWEEN PERIDOTITE AND FRANCISCAN FORMATION.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1981 Oster, Karel L. (Albers, John P.) U.S. Geological Survey
Updater 01-FEB-1990 Peterson, Jocelyn A. 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.