Fall Creek Phosphate Deposit

The Fall Creek Phosphate Deposit is a phosphorus-phosphates mine located in Bonneville county, Idaho at an elevation of 5,699 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

Name: Fall Creek Phosphate Deposit  

State:  Idaho

County:  Bonneville

Elevation: 5,699 Feet (1,737 Meters)

Primary Mineral: Phosphorus-Phosphates

Lat, Long: 43.4211, -111.42670

Map: View on Google Maps

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Satelite image of the Fall Creek Phosphate Deposit

Fall Creek Phosphate Deposit MRDS details

Site Name

Primary: Fall Creek Phosphate Deposit
Secondary: E. A. Rex Uranium and Phosphate
Secondary: Fall Creek Lease Block
Secondary: Bear Creek Lease Block
Secondary: Fall Creek Adit


Primary: Phosphorus-Phosphates
Secondary: Uranium


State: Idaho
County: Bonneville
District: Willow Cr - Caribou District

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: Caribou National Forest


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Owner Name: E. A. Rex Mining Co. ( 1966 )


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Record Type: Site
Operation Category: Past Producer
Operation Type: Underground
Discovery Method: Ore-Mineral In Place
Years of Production:
Significant: N
Deposit Size: S


General Physiographic Area: Rocky Mountain System
Physiographic Province: Middle Rocky Mountains
Physiographic Detail: Caribou Range

Mineral Deposit Model

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Name: Shale
Role: Host
Age Type: Host Rock
Age Young: Late Permian

Name: Shale
Role: Host
Age Type: Host Rock Unit
Age Young: Late Permian

Analytical Data

Analytical Data: UP TO 34.3 % P2O5 FROM 1.4 FT SAMPLE


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Comment (Location): Sec. 21 Also Included In Lease

Comment (Development): 1363.95 Acre Lease ( 1966 )

Comment (Deposit): Thickness Above For Entire Phosphatic Shale Member

Comment (Deposit): See USBM RI 6801, p. 174 (Map) for extent of property; the location of this record is placed on a pit in the SW/4 SW/4 NE/4 Sec. 17. The property includes both the Fall Creek and Bear Creek lease blocks to the southeast and northwest.

Comment (Workings): Bulldozer Trench


Reference (Deposit): Smart, R. A., And Others, 1954 , Stratigraphic Sections Of The Phosphoria Formation In Idaho: USGS Circ. 327 , 22 P.

Reference (Deposit): Jobin, D. A., And Schroeder, M. L., 1964 , Geology Of The Conant Valley Quadrangle, Bonneville County, Idaho: USGS Mineral Inv. Field Studies Map Mf - 277

Reference (Deposit): Service, A. L., 1966 , An Evaluation Of The Western Phosphate Industry And Its Resources, Pt. 3 , Idaho: USBM Rept. Inv. 6801 , 201 P.

Reference (Deposit): 1954 Recon R. A. Smart And Others, Circ. 329

Reference (Deposit): 1964 Recon D. A. Jobin And M. L. Schroeder, Map Mf - 277

Reference (Deposit): U.S. Bureau Of Mines Report of Invesigation 6801, 1966, No. 1-010764, P. 182.

Reference (Deposit): U.S. Bureau Of Mines Open-File Report MLA 8-92, 1992, Sample No. 121: Fig. 3, P. 10; Appendix A, P. 24; Appendix B, P. 26

Reference (Deposit): Idaho Bureau Of Mines And Geol. County Report 5, 1961, P. 63.

Idaho Gold

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