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Darrington Mine

Past Producer in El Dorado 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. Economic information about the deposit and operations
  13. Mining district
  14. Ownership information
  15. Production statistics
  16. Reserves and resources
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. Reporter information

Geologic information

Identification information

Deposit ID 10098578
MRDS ID M100632
Record type Site
Current site name Darrington Mine
Alternate or previous names Gurney, Holbrook, Mcguire

Geographic coordinates

Geographic coordinates: -121.08464, 38.75656 (WGS84)
Relative position APPROX 1/2 MI N OF E ARM OF FOLSOM RESERVOIR

Site location context

Political divisions (FIPS codes)

El Dorado(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Pilot Hill(quadrangle 1:24,000 scale)

Sacramento(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

South Fork American(hydrologic unit)

Lower Sacramento(hydrologic accounting unit)

Sacramento(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 011N 008E 33 SE California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Alteration

  • (Local) Serpentinization

Analytical data

Result "TYPICAL" ORE ASSAYED 11.34, 13.76, 16.65% CR2O3

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Harzburgite
  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Pyroxenite
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite

Economic information

Ore body information

  • Thickness 21.34M
    Length 91.44M
    Width 54.86M

Comments on the geologic information

  • DEPOSIT LOCATED NEAR SOUTHERN END OF ELONGATED, N-S TRENDING ULTRAMAFIC MASS APPROX 5 MI LONG AND 1 MI WIDE, WHICH FORMS FLAGSTAFF HILL. THE DEPOSIT CONSISTS OF TWO SERPENTINIZED DUNITE MASSES SEPARATED BY PYROXENITE. THE DIMENSIONS FOR THE LARGER OF THE TWO, THE UPPER OR EASTERN ORE ZONE, ARE GIVEN ABOVE. THE WEST OR LOWER ZONE LIES ALONG THE CONTACT WITH UNDIVIDED METAMORPHICS AND APPEARS TO BE OFFSET BY NUMEROUS SMALL FAULTS AT NORTH END. THE LOWER ORE ZONE MAY BE 30 FT X 30 FT X 30 FT IN SIZE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Flagstaff Hill Area

Ownership information

  • Type Owner
    Owner Jerume Lewis Et. Al., Sacramento, Ca.

Production statistics

  • Year 1944
    Material ORE
    Accuracy Estimate
    Description Ap_Grade: ^38.5% Cr2o3, Cr:Fe Ratio 1.61
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Ore Chromium Chromium 39wt-pct

Reserves and resources

  • Type Milling
    Name UPPER ZONE
    Estimate year 1951
    Total resources 45000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 10 wt-pct Chromium Major 1951

Comments on the reserve resource information

  • HIGH IRON CONTENT OF ORE MAY DISCOURAGE FURTHER DEVELOPMENT OF DEPOSIT.

Workings at the site

  • Type of workings Surface/Underground
    Length 274.32M

Comments on the workings information

  • MINE CONSISTS OF 2 GROUPS OF WORKINGS; UPPER CONSISTS OF 2 OPEN CUTS, SEVERAL ADITS AND 2 SHAFTS; LOWER CONSISTS OF AN OPEN CUT, 2 ADITS, A SHAFT AND SEVERAL PROSPECT PITS. ADITS AND SHAFT MAY ALL HAVE BEEN CONNECTED. MORE THAN 120 FT. OF SHAFTS AND RAISES THROUGH ORE BODY.

Reference information

Bibliographic references

  • Deposit

    STINSON, M.C., 1976, MINERAL PROPERTY REPORT, CDMG UNPUBLISHED REPORT.

  • Deposit

    CDMG BULL 134, P. 150-151.

  • Production

    CDMG BULL 134, P. 51

  • Reserve-Resource

    CDMG BULL 134, P. 151.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1980 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.