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Joerger 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. Geologic structures
  12. Ore body information
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Ownership information
  17. Production statistics
  18. Reserves and resources
  19. Workings at the site
  20. Links to other databases
  21. Bibliographic references
  22. General comments
  23. Reporter information

Geologic information

Identification information

Deposit ID 10043722
MRDS ID M100634
Record type Site
Current site name Joerger Mine

Geographic coordinates

Geographic coordinates: -121.1027, 38.68407 (WGS84)
Elevation 280
Relative position MINE 1.5 MI N OF CLARKSVILLE ON HIGHWAY 50.

Site location context

Political divisions (FIPS codes)

El Dorado(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Clarksville(quadrangle 1:24,000 scale)

Sacramento(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower 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 010N 008E 35 SW California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Alteration

  • (Local) Serpentinization

Analytical data

Result CHROMITE VARIES FROM 5-50%

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite
  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite

Nearby scientific data

(1) -121.1027, 38.68407
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Jointing Or Shearing Of Dunite Is N20e.

Ore body information

  • General form TABULAR
    Strike N60E
    Dip NW
    Width 9.14M

Comments on the geologic information

  • MINE OCCURS ON EASTERN EDGE OF ULTRAMAFIC LINEAR MASS IN WESTERN METAMORPHIC BELT OF SIERRA NEVADA FOOTHILLS.

Economic information about the deposit and operations

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

Mining district

District name Clarksville Area

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner John Hancock Mutual Life Ins. Co. (Surface Rights)
    Home office Boston, Ma
  • Type Owner
    Owner Bankers Title Guaranty Co. (Mineral Rights)
    Home office Sacramento, Ca
  • Type Operator
    Owner Burton, Bertha J.

Production statistics

  • Year 1918
    Period 1914-1918
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^Milling Ore, 36% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 36wt-pct
  • Year 1949
    Period 1914-1949
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^10% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 10wt-pct

Reserves and resources

  • Type In-situ
    Estimate year 1951
    Total resources 6000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 5 wt-pct Chromium Major 1951
  • Type In-situ
    Estimate year 1976
    Total resources 1000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 8 wt-pct Chromium Major 1976

Workings at the site

  • Type of workings Surface
    Overall depth 7.62M
    Overall length 45.72M
    Overall width 12.19M

Comments on the workings information

  • IN ADDITION TO THE PIT, A NUMBER OF BULLDOZER CUTS MADE FOR PROSPECTING. MOST WORK DONE IN 1942.

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

    CDMG BULL 134, P. 126.

  • Production

    STINSON, 1976, CDMG UNPUBLISHED REPORT.

General comments

Subject category Comment text
Deposit CHROMITE OCCURS IN 5 ZONES OF LOW GRADE DISSEMINATED ORE.

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.