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Black Diamond Mine

Past Producer in Glenn 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. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Land status
  15. Production statistics
  16. Reserves and resources
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10043364
MRDS ID M100090
Record type Site
Current site name Black Diamond Mine
Alternate or previous names Grey Eagle Camp

Geographic coordinates

Geographic coordinates: -122.60275, 39.73792 (WGS84)
Relative position 30 MI. WEST OF WILLOWS; 3 MI WEST OF CHROME

Site location context

Political divisions (FIPS codes)

Glenn(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Chrome(quadrangle 1:24,000 scale)

Willows(quadrangle 1:100,000 scale)

Ukiah(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Stony(hydrologic unit)

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 Glenn

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 022N 007W 25 California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Alteration

  • (Local) Serpentinization Of Dunite

Analytical data

Result ANNUAL PRODUCTION FOR 1934: CR-FE-3.1
Result 1955: CR-FE-2.8

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite
  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Harzburgite
  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Pyroxenite
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite

Nearby scientific data

(1) -122.60275, 39.73792
ListMap

Economic information

Ore body information

  • General form IRREGULAR TO LINEAR
    Strike N 60 E
    Dip 20 NW
    Thickness 7.62M
    Length 167.64M

Controls for ore emplacement

  • Normal Faulting

Comments on the geologic information

  • LINEAR, NORTH TRENDING PERIDOTITE BODY INTRUDED BY NUMEROUS MAFIC DIKES OF DIORITIC COMPOSITION.

Economic information about the deposit and operations

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

Land status

Ownership category National Forest

Production statistics

  • Year 1918
    Period 1916 - 1918
    Material CHROMITE
    Accuracy Accurate
    Description Cp_Grade: ^30-50% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 40wt-pct
  • Year 1954
    Material ORE
    Accuracy Accurate
    Description Ap_Grade: ^46.7% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 47wt-pct

Reserves and resources

  • Type In-situ
    Estimate year 1975
    Total resources 4000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 10 wt-pct Chromium Major 1975

Workings at the site

  • Type of workings Surface
    Area 0.491HA
    Overall depth 13.72M
    Overall length 85.34M
    Overall width 60.96M

Reference information

Bibliographic references

  • Deposit

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

  • Production

    STINSON, 1975, MINERAL PROPERTY REPORT: CDMG

General comments

Subject category Comment text
Deposit APPARENT NORMAL FAULTING IN PIT HAS DISPLACED MAIN ORE BODY UNKNOWN DISTANCE DOWN FAULT PLANE

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1980 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.