Armstrong Prospect

The Armstrong Prospect is a uranium mine located in Lemhi county, Idaho at an elevation of 4,400 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

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.

Site Name

Primary: Armstrong Prospect
Secondary: Donna No. 1

Commodity

Primary: Uranium

Location

State: Idaho
County: Lemhi
District: Eureka District

Land Status

Land ownership: BLM Administrative Area
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.

Holdings

Not available

Workings

Not available

Ownership

Owner Name: Hepburn T. Armstrong

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Deposit Type: Vein
Operation Type: Unknown
Discovery Method: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Physiographic Detail: Salmon River Mountains

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Some Hydrothermal

Rocks

Name: Rhyolite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Name: Rhyolite
Role: Associated
Age Type: Host Rock
Age Young: Pliocene

Name: Rhyolite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Pliocene

Analytical Data

Analytical Data: SELECTED SAMPLES TO ASSAY .2 - 1.0% U3O8

Materials

Ore: Carnotite
Gangue: Hematite

Comments

Comment (Location): On Williams Cr., 1445 Ft S And 1670 Ft E Of NW Corner Of Sec. 12 ; Info From Land.St :(1978)

Comment (Reserve-Resource): Probably A Few Tons Of Ore Could Be Obtained By Careful Sorting.

References

Reference (Deposit): Armstrong, F. C., 1964, Mineral Resources - Uranium, In Mineral And Water Resources Of Idaho: Idaho Bureau Of Mines And Geology Special Report No. 1, P. 233 - 239.

Reference (Deposit): Powers, Harold A., 1955, Armstrong Prospect: Idaho Bureau Of Mines And Geology Open - File Report, 3 P.

Reference (Deposit): 1955 Other Idaho Bureau Of Mines And Geology; Open - File Report

Reference (Deposit): 1964 Compile Idaho Bureau Of Mines And Geology Special Report No. 1

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.