Chambers Mine

Past Producer in Grant county in Oregon, United States with commodities Chromium, Platinum, Palladium, Iridium, Ruthenium, Rhodium

Geologic information

Identification information

Deposit ID 10033039
MRDS ID M014921
Record type Site
Current site name Chambers Mine
Related records 10298900

Geographic coordinates

Geographic coordinates: -118.81467, 44.35096 (WGS84)
Elevation 1951
Relative position ABOUT 10 MI FROM JOHN DAY AND PRAIRIE CITY, 13 MI FROM JOHN DAY BY ROAD
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Geographic areas

Country State County
United States Oregon Grant

Public Land Survey System information

Meridian Township Range Section Fraction State
Willamette 014S 032E 13 SE4 OF SE4 Oregon

Comments on the location information

  • NEAR WEST END OF BALDY MOUNTAIN AT HEAD OF PINE CREEK. UTM GIVEN IS FOR PGE SAMPLE SITE LOCATION. LAT/LONG GIVEN ARE FOR MINE SYMBOL LABELED CHAMBERS MINE ON TOPO MAP; UTM FOR THIS IS 4912260N, 355450E.

Commodities

Commodity Importance
Chromium Primary
Platinum Tertiary
Palladium Tertiary
Iridium Tertiary
Ruthenium Tertiary
Rhodium Tertiary

Comments on the commodity information

  • CHROMITE IS COARSE

Materials information

Materials Type of material
Chromite Ore
Antigorite Gangue
Uvarovite Gangue

Alteration

  • (Local) Serpentinization. Dunite Is Cut By Serpentine Stringers

Analytical data

Result 3 PGE ANALYSES: PT=TR-10 PPB
Result PD=4-10 PPB
Result IR=<20 PPB
Result RU=<100 PPB
Result RH=TR-16 PPB. 30-33% CR2O3, CR:FE=1.48:1

Mineral occurrence model information

Model code 15
USGS model code 8a
Deposit model name Podiform chromite (minor)
Mark3 model number none

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite
    Rock unit name Sedimentary Rocks;Canyon Mountain Complex
    Rock description Sedimentary Rocks;Canyon Mountain Complex
    Stratigraphic age (youngest) Late Permian
    Stratigraphic age (youngest) Late Permian
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite
    Rock unit name Canyon Mountain Complex
    Rock description Canyon Mountain Complex

Nearby scientific data

(1) -118.81467, 44.35096

Geologic structures

Type of structure Local
Structure description Prominent Jointing Gives Rocks A Platy Character

Ore body information

  • General form MASSIVE AND DISSEMINATED. IRREGULAR LENSES AND KIDNEYS
    Strike N45E
    Dip STEEP SE
    Thickness 15.24M
    Width 48.77M
    Length 70.1M

Controls for ore emplacement

  • Magmatic Segregation

Comments on the geologic information

  • DIORITIC VEINS, GABBRO BOULDERS, AND PYROXENITE VEINS AND DIKES TO 1.5 FT WIDE ARE COMMON

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1918

Mining district

District name Canyon City District

Land status

Ownership category National Forest
Area name Malheur Natioal Forest

Ownership information

  • Type Operator
    Owner Rustless Mining Co.
    First year 1943

Production statistics

  • Year 1945
    Period Wwi
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^30-33% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Cr2O3 Chromium Chromium 32wt-pct

Comments on the production information

  • MOST OF SHIPPED ORE CAME FROM THE GLORY HOLE. THE BEST GRADES REACHED 36% CR2O3.

Reserves and resources

  • Type In-situ
    Estimate year 1956
    Total resources 56,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 23 wt-pct Chromium Major 1956

Comments on the workings information

  • 6 OPEN CUTS, TUNNEL, GLORY HOLE, 6,204 FT OF DIAMOND DRILLING

Comments on development

  • USBM DRILLED PROPERTY IN 1950'S

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS M014921
U.S. Bureau of Mines Minerals Availability System MAS 0410230006

Bibliographic references

  • Deposit

    ALLEN, J.E., 1941, CHROMITE DEPOSITS OF OREGON (REVISED ED.): OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES BULLETIN 9, P. 60-62.

  • Deposit

    OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES, 1941, OREGON METAL MINES HANDBOOK, NORTHEASTERN OREGON--WEST HALF: OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES BULLETIN 14-B, P. 21-22.

  • Deposit

    WESTGATE, L.G., 1921, DEPOSITS OF CHROMITE IN EASTERN OREGON, IN CONTRIBUTIONS TO ECONOMIC GEOLOGY 1920: U.S. GEOLOGICAL SURVEY BULLETIN 725, P. 47.

  • Deposit

    HUNDHAUSEN, R.J., BANNING, L.H., HARRIS, H.M., AND KELLY, H.J., 1956, EXPLORATION AND UTILIZATION STUDIES, JOHN DAY CHROMITES, OREGON: U.S. BUREAU OF MINES REPORT OF INVESTIGATIONS 5238, P. 9-14.

  • Deposit

    CARLSON, C.A., AND OTHERS, 1985, ANALYSES FOR PLATINUM-GROUP ELEMENTS IN SAMPLES FROM PODIFORM CHROMITE DEPOSITS, CALIFORNIA AND OREGON: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 85-442, 14 P.

  • Deposit

    THAYER, T.P., 1940, CHROMITE DEPOSITS OF GRANT COUNTY, OREGON: U.S. GEOLOGICAL SURVEY BULLETIN 922-D, P. 96-98.

General comments

Subject category Comment text
Deposit DIMENSIONS ARE OF LARGEST ORE BODY; ATTITUDE IS OF ORE BODY. LENSES SPAN 900 FT. THERE ARE 3 MAIN ORE BODIES. SOME ORE HAS RUDE PLANAR BANDING.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1976 Lee, W. U.S. Geological Survey
Updater 01-JAN-1980 Ferns, Mark L. (Brooks, Howard C.) Oregon Department of Geology and Mineral Industries
Updater 01-MAR-1990 Peterson, Jocelyn A. U.S. Geological Survey