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Esther and Phyllis Mine

Past Producer in Placer 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. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Mining district
  12. Land status
  13. Production statistics
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10043716
MRDS ID M100627
Record type Site
Current site name Esther and Phyllis Mine

Geographic coordinates

Geographic coordinates: -120.77631, 39.12461 (WGS84)
Elevation 1164

Site location context

Political divisions (FIPS codes)

Placer(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Foresthill(quadrangle 1:24,000 scale)

Truckee(quadrangle 1:100,000 scale)

Chico(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

North Fork American(hydrologic unit)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Federal lands

Tahoe National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States California Placer

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 015N 011E 19 W2 OF SE California

Comments on the location information

  • THE WORKINGS ARE LOCATED JUST SOUTH OF THE SUGAR PINE RD, ABOUT 1.1 MILES WEST OF THE OLD SUGAR PINE GUARD STATION

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Nearby scientific data

(1) -120.77631, 39.12461
ListMap

Economic information

Ore body information

  • General form IRREGULAR

Comments on the geologic information

  • DEPOSIT IS LOCATED IN THE NORTHERN HALF OF A N-NW TRENDING BELT OF PERIDOTITE EXPOSED OVER AN AREA APPROX. 2 MILES BY 5 MILES AND IS BORDERED BY PALEOZOIC METAMORPHICS AND TERTIARY VOLCANICS.

Economic information about the deposit and operations

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

Mining district

District name Forest Hill Divide Area

Land status

Ownership category National Forest

Production statistics

  • Year 1941
    Material ORE CR
    Accuracy Accurate
    Description Ap_Grade: ^47.67% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 48wt-pct
  • Year 1942
    Material ORE CR
    Accuracy Accurate
    Description Ap_Grade: ^46.89% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 47wt-pct
  • Year 1943
    Period 1941-1943
    Material ORE CR
    Accuracy Accurate
    Description Cp_Grade: ^Avg. 46% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 46wt-pct
  • Year 1943
    Material ORE CR
    Accuracy Accurate
    Description Ap_Grade: ^ 10.52% Fe
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 11wt-pct

Comments on the reserve resource information

  • CDMG MINERAL PROPERTY REPORT, 1975, UNPUBLISHED

Workings at the site

  • Type of workings Surface
    Overall length 411.48M

Comments on the workings information

  • WORKINGS CONSISTED OF BULLDOZER CUTS, SOME SHALLOW OPEN CUTS AND SHAFTS.

Comments on development

  • A SMALL MILL WAS BUILT TO CONCENTRATE DETRITAL CHROMITE FROM SOIL BUT WAS NOT SUCCESSFUL BECAUSE THE MILL COULD NOT SEPARATE LIMONITIC COATING FROM THE CHROMITE

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

    RYNEARSON, G.A., 1953, CDMG BULL 134, PT. 3, CHAPT. 5, P. 215, 216, 308

  • Production

    CDMG MINERAL PROPERTY REPORT, 1975, UNPUBLISHED

General comments

Subject category Comment text
Deposit DEPOSIT CONSISTED OF CHROMITE BOULDERS, FRAGMENTS AND DETRITUS IN THE WEATHERED RESIDUAL SOIL, UP TO 15 FT THICK IN SOME PLACES.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1983 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.