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North Fork Chrome Mine

Past Producer in Placer county in California, United States with commodities Chromium, Iron
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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. Mineral rights holdings
  13. Land status
  14. Ownership information
  15. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10285671
MRDS ID M100628
MAS/MILS ID 0060610631
Record type Site
Current site name North Fork Chrome Mine
Related records 10043717

Geographic coordinates

Point of reference Trench
Geographic coordinates: -120.78713, 39.16129 (WGS84)
Elevation 1061
Location accuracy 10(meters)

Site location context

Political divisions (FIPS codes)

Placer(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Dutch Flat(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 015 N 011 E 07 C SWNW California

Commodities

Commodity Importance
Chromium Critical Tertiary
Iron Tertiary

Materials information

Materials Type of material
Chromite Unknown
Olivine Unknown
Pyroxene Unknown
Serpentine Unknown

Nearby scientific data

Trench (1) -120.78713, 39.16129
ListMap

Economic information

Ore body information

  • Area 1HA
    Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 UNKNOWN
    Type of Orebody #2 OTHER
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control LITHOLOGY
    Secondary Ore Control FRACTURING
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 CARBONITIZATION
    Total Surface Area (HA) 1
    Date of Last Modification 780615

Economic information about the deposit and operations

Operation type Surface
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1417
Year of first production 1941

Mining district

District name Forest Hill Divide Area

Mineral rights holdings

Type of mineral rights Private Lease

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner U.S. Forest Service
    Interest 100
    Home office California
    Year 1976
  • Type Operator
    Owner C. H And H A Geisendorfer-(Last Operators-1940-
    Home office California
    Year 1976
    Last year 1943

Workings at the site

  • Type of workings Surface
    Area 1HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Mining Method OPEN PIT
    Swell Factor .6
    Avg. Overburden Thickness 0
    Primary Material Cover HARD ROCKS
    Percentage 49
    Hardness of Ore HARD ROCKS

Reference information

Bibliographic references

  • Deposit

    RYNEARSON,GA 1953.CAL DIV MINES BULL 134,PT 3,CH 5 PP 207-2

General comments

Subject category Comment text
Deposit ANALYSIS OF 113 LONG TONS IN 1941 46.64% CR2O3, CR/FE=2.6 N VES ESTIMATED IN LITERATURE OR SEEN DURING FIELD VISIT INSUFFICIENT DATA FOR MATRIX CALCULATIONS. ANALYSIS BY CDMG IN 1976 GAVE FOLLOWING PERCENTAGES-MASSIVE 2 09.30,CR2O3 43.85,FEO 09.77,TOTAL FE 16.08,AL203 10.39,MGO CR/FE 2.40.DISSEMINATED ORE=S102 01.90,CR2O3 54.08,FEO 13.44 FE 15.44,AL203 14.17,MGO 11.61,CR/FE 3.08.

Reporter information

Type Date Name Affiliation Comment
Reporter 05-NOV-1984 Unknown U.S. Bureau of Mines

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.