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Centennial Phosphate Mine

Past Producer in Clark county in Idaho, United States with commodities Fluorine-Fluorite, Phosphorus-Phosphates, Uranium, Vanadium
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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. Mineral rights holdings
  12. Land status
  13. Ownership information
  14. Production statistics
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10119484
MAS/MILS ID 0160330111
Record type Site
Current site name Centennial Phosphate Mine
Alternate or previous names Ruby Mine, Troublesome Ridge Phophate Deposit

Geographic coordinates

Point of reference Pit
Geographic coordinates: -111.69224, 44.54991 (WGS84)
Elevation 2652
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Clark(county)

Idaho(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Upper Red Rock Lake(quadrangle 1:24,000 scale)

Hebgen Lake(quadrangle 1:100,000 scale)

Ashton(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Red Rock(hydrologic unit)

Missouri Headwaters(hydrologic accounting unit)

Missouri Headwaters(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Caribou-Targhee 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 Idaho Clark

Public Land Survey System information

Meridian Township Range Section Fraction State
Boise 014 N 040 E 12 SWSESW Idaho

Commodities

Commodity Importance
Fluorine-Fluorite Critical Tertiary
Phosphorus-Phosphates Primary
Uranium Tertiary
Vanadium Critical Tertiary

Materials information

Materials Type of material
Collophane Unknown
Quartz Unknown

Nearby scientific data

Pit (1) -111.69224, 44.54991
ListMap

Economic information

Ore body information

  • Strike N65W
    Dip 15S
    Thickness 2M
    Length 2135M
    Width 488M
    Area 100HA
    Depth to top 30M
    Field Value
    Type of Orebody #1 SEDIMENTARY
    Shape of Orebody #1 TABULAR
    Primary mode of Origin SEDIMENTATION
    Primary Ore Control BEDDING
    Degree of Wallrock Alter. NONE
    Strike And Dip N65W:15S
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 3
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 100
    Date of Last Modification 830316

Economic information about the deposit and operations

Operation type Surface
Development status Past Producer
Commodity type Both
Significant No
Year of first production 1956

Mineral rights holdings

Type of mineral rights Federal Lease

Land status

Ownership category National Forest
Area name Targhee National Forest

Ownership information

  • Type Owner
    Owner USA Federal Phosphate Lease
    Interest 100
    Year 1978
  • Type Operator
    Owner J. R. Simplot Co., Fertilizer Division
    Home office Idaho
    Year 1978

Production statistics

  • Year 1956
    Description Phosphate Rock 31% P2o5 76499 Mt Ore Per Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Phosphorus-Phosphates Phosphorus 31wt-pct
  • Year 1957
    Description Phosphate Rock 31% P2o5 135000 Mt Ore Per Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Phosphorus-Phosphates Phosphorus 31wt-pct
  • Year 1958
    Description Phosphate Rock 31% P2o5 31499 Mt Ore Pre Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Phosphorus-Phosphates Phosphorus 31wt-pct

Comments on the reserve resource information

  • THIS TONNAGE FIGURE IS FROM JR SIMPLOT CO. TONNAGE IS FOR OPEN PIT OPERATION. A SIGNIFICANT TONNAGE OF ACID GRADE(>31% P2O5) IS THERE BUT COULD ONLY BE MINED BY UNDERGROUND METHODS. SIMPLOT FEELS THE TONNAGES GIVEN BY JEMMETT AND THE USBM FOR OPEN PIT MINING ARE MUCH TO HIGH. M1C5 OPEN PIT TONNAGE FROM JEMMETT (1955) MAX MINING DEPTH 38M. M2 UNDERGROUND TONNAGE FROM JEMMETT M3C5 UNDERGROUND TONNAGE FROM USBM MINERAL PROP. FILE M5C5 OPEN PIT TONNAGE FROM USBM MINERAL PROP FILE M4C5

Reference information

Bibliographic references

  • Deposit

    HONKALA,F.S.,1953,PRELIMINARY REPORT ON GEOLOGY OF

  • Deposit

    CENTENNIAL RANGE, MONTANA-IDAHO,PHOPHATE DEPOSITS:U.S.

  • Deposit

    GEOL.SURVEY OPEN FILE REPORT.

  • Deposit

    JEMMETT,1955,MS THESIS, UNIV.OF IDAHO,MOSCOW,IDAHO 67P

  • Deposit

    U.S. GEOLOGICAL SURVEY MISC. FIELD STUDIES MAP MF-1342-B, 1981.

General comments

Subject category Comment text
Deposit SIMPLOT LEASED 5225 ACRES, 2330 IN MONTANA, 2895 IN IDAHO, THEY MAINTAIN THE LEASES AND MAY MINE THE DEPOSITS BY UNDERGROUND METHODS IN 1957 OPERATION WAS OPEN PIT, 7:1 SR, 1500 ST PER DAY IN SUMMER. EQUIPMENT:2 24 YD SCRAPERS, 2 D-9 CATS, 1 1YD SHOVEL, 18 25 ST TRUCKS. MINING METHOD:OVERBURDEN AND HENGING WALL REMOVED BY SCRAPERS AND BULLDOZERS. DOZERS BREAK ORE AND DOZE IT INTO PILES FROM WHICH SHOVEL LOADS INTO TRUCKS

Reporter information

Type Date Name Affiliation Comment
Reporter 23-JUN-1993 Conyac, Martin U.S. Bureau of Mines

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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