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North Fork Chrome 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. 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. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

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

Geographic coordinates

Geographic coordinates: -120.78714, 39.16128 (WGS84)
Elevation 1061
Relative position APPROX. 26 MILES NE OF AUBURN BY ROAD

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 015N 011E 07 SW OF NW California

Comments on the location information

  • MINE LOCATED ON A STEEP EAST FACING SLOPE OF A NORTH TRENDING RIDGE OF FOREST HILL DIVIDE. FOREST HILL DIVIDE SEPARATES GIANT GAP GULCH FROM MC IN TYRE GULCH.

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Alteration

  • (Local) Complete Serpentinization Of Dunite

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite

Nearby scientific data

(1) -120.78714, 39.16128
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Peridotite Fractured By Two Prominent Sets Of Joints, Clearing The Rock Mass Into Roughly Rectangular Boulders

Ore body information

  • General form IRREGULAR

Comments on the geologic information

  • DEPOSIT LOCATED IN A LINEAR MASS OF ULTRAMAFIC ROCKS THAT HAS INTRODED A SEQUENCE OF PALEOZOIC META MOROHICS OF THE CALAVERAS GROUP. THE EASTERN CONTACT OF THE ULTRAMAFICS IS COLLINEAR WITH AND PROBABLY PART OF THE MELONES FAULT ZONE.

Economic information about the deposit and operations

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

Mining district

District name Foresthill Divide Area

Land status

Ownership category National Forest

Ownership information

  • Type Operator
    Owner H. A. And C. A. Geisen Dorfer
    First year 1940
    Last year 1943
  • Type Owner
    Owner U.S. Government

Comments on the production information

  • 1ST PRODUCTION FIGURE ABOVE MINED IN 1918 BUT NOT SHIPPED UNTIL 1940.

Comments on the workings information

  • WORKINGS CONSISTED OF ON OPEN CUT 15 FT LONG AND 15 FT DEEP (1953). ALL WORKINGS OBLITERATED BY A BULLDOZER AS OF 1975

Reference information

Bibliographic references

  • Deposit

    RYNEARSON, G.A., 1953, CDMG BULL 134, PT. 3, CHAPT. 5, P. 207, 208, 311

  • Deposit

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

  • Production

    CDMG BULL 134, PT. 3, CHAPT. 5, P. 208

General comments

Subject category Comment text
Deposit DEPOSIT CONTAINED BETWEEN 20-60% CR2O3

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.