The Centennial Phosphate Mine is a phosphorus-phosphates mine located in Clark county, Idaho at an elevation of 8,701 feet.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
Elevation: 8,701 Feet (2,652 Meters)
Commodity: Phosphorus-Phosphates
Lat, Long: 44.55, -111.69140
Map: View on Google Maps
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Centennial Phosphate Mine MRDS details
Site Name
Primary: Centennial Phosphate Mine
Secondary: Ruby Mine
Secondary: Troublesome Ridge Phophate Deposit
Commodity
Primary: Phosphorus-Phosphates
Tertiary: Vanadium
Tertiary: Fluorine-Fluorite
Tertiary: Uranium
Location
State: Idaho
County: Clark
Land Status
Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Administrative Organization: Targhee National Forest
Holdings
Type: Federal Lease
Workings
Not available
Ownership
Owner Name: J. R. Simplot Co., Fertilizer Division
Home Office: Idaho
Info Year: 1978
Owner Name: USA Federal Phosphate Lease
Percent: 100.0
Info Year: 1978
Production
Year: 1956
Description: Phosphate Rock 31% P2o5 76499 Mt Ore Per Year
Year: 1957
Description: Phosphate Rock 31% P2o5 135000 Mt Ore Per Year
Year: 1958
Description: Phosphate Rock 31% P2o5 31499 Mt Ore Pre Year
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Surface
Mining Method: Unknown
Year First Production: 1956
Years of Production:
Organization:
Significant: N
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Unknown: Collophane
Unknown: Quartz
Comments
Comment (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
Comment (Reserve-Resource): 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
References
Reference (Deposit): HONKALA,F.S.,1953,PRELIMINARY REPORT ON GEOLOGY OF
Reference (Deposit): CENTENNIAL RANGE, MONTANA-IDAHO,PHOPHATE DEPOSITS:U.S.
Reference (Deposit): GEOL.SURVEY OPEN FILE REPORT.
Reference (Deposit): JEMMETT,1955,MS THESIS, UNIV.OF IDAHO,MOSCOW,IDAHO 67P
Reference (Deposit): U.S. GEOLOGICAL SURVEY MISC. FIELD STUDIES MAP MF-1342-B, 1981.
Idaho Gold
"Where to Find Gold in Idaho" looks at the density of modern placer mining claims along with historical gold mining locations and mining district descriptions to determine areas of high gold discovery potential in Idaho. Read more: Where to Find Gold in Idaho.
