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Grau Mine

Past Producer in Tehama 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. Land status
  15. Ownership information
  16. Production statistics
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10043458
MRDS ID M100225
Record type Site
Current site name Grau Mine
Alternate or previous names North Elder Creek Group

Geographic coordinates

Geographic coordinates: -122.67053, 40.02736 (WGS84)
Elevation 756
Relative position APPROX. 31 MILES WEST OF RED BLUFF, CA.

Site location context

Political divisions (FIPS codes)

Tehama(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Raglin Ridge(quadrangle 1:24,000 scale)

Red Bluff(quadrangle 1:100,000 scale)

Redding(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Federal lands

Mendocino 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 Tehama

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 025N;025N;025N 007W;007W;007W 17;17;17 SE OF NW OF NE California

Comments on the location information

  • WORKINGS LOCATED ON THE NORTH SLOPE OF THE NORTH FORK DRAINAGE OF ELDER CREEK.

Commodities

Commodity Importance
Chromium Critical Primary

Comments on the commodity information

  • U.S.G.S., 1941

Materials information

Materials Type of material
Chromite Ore

Alteration

  • (Local) Partial To Complete Serpen Tinization Of Host Rocks.

Analytical data

Result ANALYSIS OF 44 SAMPLES AVGERAGED 18% CR2O3

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Jurassic
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite
    Rock unit name Knoxville
    Rock description Knoxville

Nearby scientific data

(1) -122.67053, 40.02736
ListMap

Economic information

Ore body information

  • General form POD
  • General form POD

Comments on the geologic information

  • GRAU MINE IS LOCATED NEAR THE NORTH END OF THE ELDER CREEK MASS, ALONG, FAULT BOUNDED N-S TRENDING ULTRAMAFIC BODY THAT IS EXPOSED OVER AN AREA APPROX. 120 KM BY 4 KM.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1885
Year of first production 1893
Year of last production 1958

Mining district

District name Elder Creek Area

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner Withers, John K.
    Home office P.O. Box 6341, Santa Rosa, Ca
    First year 1975
  • Type Owner
    Owner Ellis, Rose N.
    Home office 3841 19th St., San Francisco, Ca.
  • Type Operator
    Owner Jubilee Mining Co.
    First year 1958

Production statistics

  • Year 1918
    Period 1893-1918
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^45-50% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 48wt-pct
  • Year 1944
    Period 1941-1944
    Material ORE
    Accuracy Accurate
    Description Cp_Grade: ^Milling Ore, Avg. 10% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 10wt-pct
  • Year 1944
    Period 1941-1944
    Material CON
    Accuracy Accurate
    Description Cp_Grade: ^Avg. 44.0% Cr2o3, Cr To Fe Ratio 3.1 To 1
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 44wt-pct
  • Year 1952
    Material CON
    Accuracy Accurate
    Description Ap_Grade: ^Avg. 43.09% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 43wt-pct

Comments on the workings information

  • WORKINGS (EAST PIT) COMPLETELY COVERED BY DEBRIS FLOWS; WORKINGS (WEST PIT) CONSISTED OF A LARGE BENCH CUT 250 FT. LONG; 100 FT. WIDE AND 60 FT. DEEP. (1975)

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

    WELLS, F.G. AND HAWKES, H.E., 1965, CDMG BULL 134, PART 1, CHAPT. 3, P. 159, 161.

  • Production

    STINSON, 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED

General comments

Subject category Comment text
Deposit ORE BODY OF EAST PIT TRENDS N 80 W, DIPS 40 N AND HAS AVG. THICKNESS OF 30 FT. ORE BODY OF WEST PIT TRENDS N 35 W, DIPS AT MODERATE ANGLE TO THE NE AND IS 100 FT LONG WITH AVG. THICKNESS OF 20 FT.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1982 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.

External references

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.