Chambers Mine

Past Producer in Grant county in Oregon, United States with commodity Chromium

Geologic information

Identification information

Deposit ID 10298900
MRDS ID M014921
MAS/MILS ID 0410230006
Record type Site
Current site name Chambers Mine
Alternate or previous names Chambers, George Len
Related records 10033039

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -118.81636, 44.35015 (WGS84)
Elevation 2010
Location accuracy 100(meters)
(click for info)

Geographic areas

Country State County
United States Oregon Grant

Public Land Survey System information

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

Commodities

Commodity Importance
Chromium Primary

Materials information

Materials Type of material
Chromite Unknown
Olivine Unknown
Pyroxene Unknown
Serpentine Unknown
Spinel Unknown

Nearby scientific data

Main Entrance (1) -118.81636, 44.35015

Ore body information

  • Strike N50E
    Dip 50S
    Thickness 70M
    Depth to top 0M
    Width 9M
    Length 49M
    Field Value
    MAS Matrix # 2
    MAS Column # 1
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 OTHER
    Shape of Orebody #2 TABULAR
    Primary mode of Origin MAGMATIC DIFFER
    Secondary mode of Origin RESIDUAL CONCENT
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 OTHER
    Strike And Dip N50E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 830316
  • Strike N50E
    Dip 50S
    Thickness 98M
    Depth to top 85M
    Width 14M
    Length 81M
    Field Value
    MAS Matrix # 2
    MAS Column # 2
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 OTHER
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control IGNEOUS
    Secondary Ore Control LITHOLOGY
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 OTHER
    Strike And Dip N50E
    Minimum Depth to Top 85
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 830316
  • Strike N45E
    Dip 60S
    Thickness 21M
    Depth to top 0M
    Width 33M
    Length 34M
    Field Value
    MAS Matrix # 3
    MAS Column # 1
    Shape of Orebody #1 TABULAR
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control IGNEOUS
    Secondary Ore Control LITHOLOGY
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 OTHER
    Strike And Dip N45E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 830316
  • Strike N45E
    Dip 40S
    Thickness 14M
    Depth to top 0M
    Width 8M
    Length 91M
    Field Value
    MAS Matrix # 4
    MAS Column # 1
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 OTHER
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control IGNEOUS
    Secondary Ore Control LITHOLOGY
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 OTHER
    Strike And Dip N45E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 830316
  • Strike N50E
    Dip 55E
    Thickness 43M
    Depth to top 0M
    Width 31M
    Length 274M
    Area 2.5HA
    Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 LENTICULAR
    Type of Orebody #2 OTHER
    Shape of Orebody #2 IRREGULAR
    Primary mode of Origin UNKNOWN
    Primary Ore Control IGNEOUS
    Secondary Ore Control LITHOLOGY
    Degree of Wallrock Alter. NONE
    Type of Wallrock Alter. #1 OTHER
    Strike And Dip N50E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 4.3
    Min. Thick. Unconsol. Mat. 2
    Total Surface Area (HA) 2.5
    Date of Last Modification 830316

Comments on the geologic information

  • TYPE OF WALLROCK ALTERATION IS SERPENTINIZATION.
  • CHROME TO IRON RATIO EQUALS 1.48 TO 1.

Economic information

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1917
Year of first production 1918

Mining district

District name John Day District

Mineral rights holdings

Type of mineral rights Fee Ownership

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner C. P Haight Jr
    Interest 100
    Home office Oregon
    Year 1975

Production statistics

  • Year 1917
    Description Ore Averaged 30-33 Percent Cr203 2720 Tonnes/Annum
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 2,720mt 31wt-pct
  • Year 1918
    Description Ore Averaged 30-33 Percent Cr203 2720 Tonnes/Annum
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 2,720mt 31wt-pct

Comments on the production information

  • THE 37.7 PERCENT CR2O3 CONCENTRATE WOULD HAVE A CR:FE RATIO OF 2.16.

Reserves and resources

  • Type In-situ
    Estimate year 1980
    Inferred 113,000mt ore
    Total resources 113,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 23 wt-pct Chromium Major 1980

Comments on the reserve resource information

  • M1C1=M2C1+M3C1+M4C1 MATRIX 1. MATRIX 1 REPRESENTS TONNAGE AND GRADE FOR THE CHAMBERS MINE AS A WHOLE INCLUDING THE SOUTHWEST, CENTRAL, AND NORTHEAST OREBODIES. MATRIX 2 REPRESENTS THE NORTHEAST OREBODY. COLUMN 1, QUANTITY AT 75 PERCENT REPRESENTS CHROMITE RESOURCES DRILLED BY THE U. S. BUREAU OF MINES IN 1939. OTHER QUANTITIES OF COLUMN 1 (PROBABILITIES 50-10 PERCENT) ARE CUMULATIVE FROM COLUMN 2. COLUMN 2 REPRESENTS A POSSIBLE EXTENSION IN DEPTH OF THE NORTHEAST OREBODY BELOW THE MAXIMUM DEPTH OF CORE DRILLING AT THE 6250 FOOT LEVEL. THIS DEPTH EXTEN- SION WAS CARRIED 98 METERS DOWNDIP OR 85 METERS VERTICALLY MATRIX 3 REPRESENTS TONNAGE AND GRADE FOR THE CENTRAL ORE BODY.

Workings at the site

  • Type of workings Surface
    Area 0HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method GLORY HOLE
    Swell Factor .6
    Percent Waste Rock 10
    Avg. Overburden Thickness 1
    Primary Material Cover SAND, GRAVEL
    Percentage 100
    Hardness of Ore HARD ROCKS
    Max. Pit Slope (degrees) 45
    Capacity 100
    Capacity Units MT ORE/DAY
    Preprod. Stripping Vol. .58
    Unit Production Cost 5
    Units of Production $/MT ORE
    Operating Days per Year 250
    Operating Shifts per Day 2
    Year of Information 1975
  • Type of workings Underground
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method INCLINED CUT AND FILL 10-65
    Swell Factor .6
    Percent Recovery 90
    Hardness of Rock HARDROCK WITH LITTLE WATER
    Rock Characteristics NO PLANES OF WEAKNESS
    Rock Support Chars. SUPPORTING MAY BACK SLAB
    Mine Support Chars. POST, HEADBOARD, CAPS, ROOF BOLTS
    Avg. Length of Adits (m) 182
    Number of Adits 1
    1st Condition of Workings PLUGGED
    Capacity 100
    Capacity Units MT ORE/DAY
    Unit Production Cost 15
    Units of Production $/MT ORE
    Operating Days per Year 250
    Operating Shifts per Day 2
    Year of Information 1975

Comments on other economic factors

  • DILUTION ALLOWANCE OF 10 PERCENT CONSIDERED FOR UNDERGROUND MINING.
  • DILUTION ALLOWANCE OF 10 PERCENT CONSIDERED FOR SURFACE MINING.

Reference information

Links to other databases

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

Bibliographic references

  • Reserve-Resource

    HUNDHAUSEN, R.J., 1956, JOHN DAY CHROMITE STUDIES,

  • Reserve-Resource

    BUMINES RI 5238.

  • Deposit

    U.S. GEOLOGICAL SURVEY BULLETIN 725-A, 1920, P. 52.

  • Deposit

    OR. DEPT. GEOL. AND MIN. INDUST. BULLETIN 9, 1938, P. 60.

  • Deposit

    OR. DEPT. GEOL. AND MIN. INDUST. BULLETIN 14-B, 1941, P. 21.

  • Deposit

    U.S. BUREAU OF MINES RI 5238, 1956, P. 9.

General comments

Subject category Comment text
Deposit OWNER: C.P. HAIGHT, JR. OTHER NAME: GEORGE LEN. FLD OP FIRST QUARTER FY 1980 SHOWS NO DEPOSIT REPORT PLANNED. CR:FE RATIO IS 1.48:1. DROPPED FROM EVALUATION DURING FY 1980

Reporter information

Type Date Name Affiliation Comment
Reporter 04-SEP-96 Lowe, Nathan T. U.S. Bureau of Mines