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Brandon

Past Producer in El Dorado 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. 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 10029666
MRDS ID M007350
Record type Site
Current site name Brandon
Related records 10211761

Geographic coordinates

Geographic coordinates: -120.93519, 38.56573 (WGS84)
Elevation 219
Relative position 3 MI EAST OF LATROBE

Site location context

Political divisions (FIPS codes)

El Dorado(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Latrobe(quadrangle 1:24,000 scale)

Placerville(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Cosumnes(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California El Dorado

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 008N 009E 12 E2 California

Comments on the location information

  • ON RIDGE BETWEEN HUNGRY HOLLOW AND INDIAN CREEKS. NO MINE SHOWN ON TOPO MAP; LOCATION GIVEN IS FOR PGE SAMPLE SITE LOCATION

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

Alteration

  • (Local) Ultramafic Rocks Are Serpentinized

Analytical data

Result 1 PGE ANALYSIS: PT=130 PPB
Result PD=186 PPB
Result IR=200 PPB
Result RU=230 PPB
Result RH=7 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 > Ultramafic Intrusive Rock > Peridotite
    Rock unit name Bear Mountain Ophiolite
    Rock description Bear Mountain Ophiolite
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite

Nearby scientific data

(1) -120.93519, 38.56573
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Shearing

Ore body information

  • General form PODS
    Length 3.05M
    Width 1.22M

Controls for ore emplacement

  • Magmatic Segregation

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 1918

Ownership information

  • Type Operator
    Owner Robert D. Domecq, Et Al.

Production statistics

  • Year 1918
    Material ORE
    Accuracy Estimate
    Description Ap_Grade: ^45% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Cr2O3 Chromium Chromium 45wt-pct

Comments on the production information

  • 4 CARLOADS WERE PRODUCED IN 1918. MINE HAS BEEN IDLE SINCE THEN AND WORKINGS ARE CAVED. A SMALL AMOUNT OF CHROMITE REMAINS IN DEEPEST PIT

Comments on the workings information

  • 3 OPEN CUTS, 10-25 FT LONG.

Comments on development

  • OPERATED BY BRANDON BROTHERS DURING WWI

Reference information

Bibliographic references

  • Deposit

    CATER, F.W., JR., RYNEARSON, G.A., AND DOW, D.H., 1951, GEOLOGICAL INVESTIGATIONS OF CHROMITE IN CALIFORNIA: CALIFORNIA DIVISION OF MINES BULLETIN 134, PT. 3, CH. 4, P. 122-123, 164, PL. 8.

  • 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.

  • Deposit

    CLARK, W.B., AND CARLSON, D.W., 1956, MINES AND MINERAL RESOURCES OF EL DORADO COUNTY, CALIFORNIA: CALIFORNIA JOURNAL OF MINES AND GEOLOGY V. 52, NO. 4, P. 465.

  • Deposit

    LINDGREN, WALDEMAR, 1894, SACRAMENTO FOLIO, CALIFORNIA: U.S. GEOLOGICAL SURVEY GEOLOGIC ATLAS OF THE UNITED STATES, FOLIO 5, SCALE 1:125,000.

  • Deposit

    BRADLEY, W.W., HUGUENIN, EMILE, LOGAN, C.A., TUCKER, W.B., AND WARING, C.A., 1918, MANGANESE AND CHROMIUM IN CALIFORNIA: CALIFORNIA STATE MINING BUREAU BULLETIN 76, P. 132.

General comments

Subject category Comment text
Deposit CONTACT OF CHROMITE PODS AND DUNITE IS SHEARED

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1972 Gere, W. 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.