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  3. Mineral Resource Data System (MRDS)

Grau Mine

Past Producer in Tehama 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. Reserves and resources
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10165565
MRDS ID W025876
MAS/MILS ID 0061030008
Record type Site
Current site name Grau Mine
Alternate or previous names North Elder Creek Group
Related records 10111207

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -122.67279, 40.02656 (WGS84)
Elevation 756
Location accuracy 100(meters)

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 025 N 007 W 17 E2NWNE California

Commodities

Commodity Importance
Chromium Critical Primary
Iron Tertiary

Materials information

Materials Type of material
Antigorite Unknown
Chromite Unknown
Enstatite Unknown
Magnesite Unknown
Olivine Unknown

Nearby scientific data

Main Entrance (1) -122.67279, 40.02656
ListMap

Economic information

Ore body information

  • Strike N80W
    Dip 40N
    Thickness 9.1M
    Length 36.5M
    Width 22.8M
    Area 50HA
    Depth to top 0M
    Field Value
    Type of Orebody #1 OTHER
    Shape of Orebody #1 IRREGULAR
    Shape of Orebody #2 TABULAR
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control IGNEOUS
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 OTHER
    Strike And Dip N80W:40N
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 50
    Date of Last Modification 830316

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1886
Year of first production 1942

Mining district

District name North Elder Crk

Mineral rights holdings

Type of mineral rights Unknown

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner John K. Withers
    Interest 100
    Home office California
    Year 1985

Reserves and resources

  • Type In-situ
    Estimate year 1946
    Measured 15000mt ore
    Indicated 7000mt ore
    Demonstrated 22000mt ore
    Inferred 14000mt ore
    Total resources 36000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 10 wt-pct Chromium Major 1946
  • Type In-situ
    Estimate year 1946
    Indicated 1200mt ore
    Demonstrated 1200mt ore
    Inferred 2400mt ore
    Total resources 3600mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 44 wt-pct Chromium Major 1946

Comments on the reserve resource information

  • IN DEPOSIT REPORT "CHROMITE DEPOSITS OF THE NORTHELDER CREEK AREA, TECHAMA COUNTY, CALIFORNIA."ALSO SEE SEQ# 0061030010.
  • THE 39,000 MT. ARE MINED WITH THREE OTHER PROPERTIES IN THE AREA. THE COST AND MINING METHODS ARE UNDER SEQ. NO. 0061030010.

Reference information

Bibliographic references

  • Deposit

    CALIF DIV MINES GEOL BULL 134 CH3 PP133-191 1965.

  • Deposit

    USGS BULL 945-G PP190-210 1946.

  • Deposit

    CALIF JOUR MINES GEOL V42 NO3 PP183-195 1946.

  • Deposit

    CALIF STATE DIV MINES 39TH REPT STATE MINERAL CH1 PP90-92 19

  • Deposit

    WFOC MIN PROP FILE.

General comments

Subject category Comment text
Deposit 3/75 ORE BODY TYPE - DISSEMINATED,STRINGERS & MASSIVE; ORE & Y ROCK FORMING CONTEMPORANEOUSLY. MINE CAP CST-DEV.15M; EQIP INCL. IN 061030011; WORK CAP.125M DEV0; EXP0: CUSTOM MILL,NO CAPIT.COSTS INVOLVED: CR/FE RATIO ALTERATION TYPE-SERPENTINIZATION E=S102 01.77,CR2O3 52.62,FEO 11.29,TOTAL FE 14.79,AL203 12.6 5.75,CR/FE 3.13

Reporter information

Type Date Name Affiliation Comment
Reporter 12-JUL-1993 Wetzel, Nicholas U.S. Bureau of Mines

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.