St. Joe Prospect

The St. Joe Prospect is a copper and cobalt mine located in Lemhi county, Idaho at an elevation of 7,001 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: St. Joe Prospect
Secondary: Blackbird Mine

Commodity

Primary: Copper
Primary: Cobalt
Tertiary: Nickel
Tertiary: Gold

Location

State: Idaho
County: Lemhi
District: Blackbird 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: Salmon National Forest

Holdings

Not available

Workings

Type: Underground

Ownership

Owner Name: Hanna Mining Co.

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Year: 1895
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

Form: IRREGULAR, LENS

Structure

Type: L
Structure: Folds

Alterations

Not available

Rocks

Name: Schist
Role: Host
Age Type: Host Rock Unit
Age Young: Neoproterozoic

Name: Schist
Role: Host
Age Type: Host Rock
Age Young: Neoproterozoic

Name: Gabbro
Role: Associated
Age Type: Associated Rock
Age Young: Eocene

Name: Gabbro
Role: Associated
Age Type: Associated Rock Unit
Age Young: Eocene

Analytical Data

Analytical Data: .8 % NI ( 1913 )
Analytical Data: PYRRHOTITE CARRIED $18 AU/TON, MINOR CO, NI (1901)
Analytical Data: 0.6 - 1.34% CO, 2.4% CU (DUMP SAMPLES)

Materials

Ore: Chalcopyrite
Ore: Gold
Ore: Erythrite
Ore: Cobaltite
Gangue: Pyrrhotite
Gangue: Pyrite
Gangue: Magnetite
Gangue: Quartz

Comments

Comment (Development): St. Joe Claim Now Included In Blackbird Mine, See No. 363

Comment (Workings): Workings Are Flooded

Comment (Location): 0.3 Mi. Up Meadow Creek, Adjoins The Bohannon On The N.W.

Comment (Geology): Original Structures entry: Local - Folds

Comment (Geology): Original ore control entry: Shear Zone

References

Reference (Deposit): Umpleby, J.B., 1913, Geology And Ore Deposits Of Lemhi County, Idaho: USGS Bulletin 528, 182 P.

Reference (Deposit): Anderson, A.L., 1943, Preliminary Report On The Cobalt Deposits In The Blackbird District, Lemhi County, Idaho: Idaho Bureau Of Mines And Geology Pamph 61, 34 P.

Reference (Deposit): Canney, F.C., 1953, Preliminary Report Of Geochemical Investigations In The Blackbird District, Lemhi County, Idaho: USGS Open-File Rept.

Reference (Deposit): Baldwin, J.A., October 8, 1976, Personal Communication

Reference (Deposit): Reed, G.C., And Herdlick, J.A., 1947, Blackbird Cobalt Deposits, Lemhi County, Idaho: USBM Rept. Inv. 4012, 14 P.

Reference (Deposit): Hess, F.L., 1921, Cobalt: USGS Mineral Resources Of Us, Pt. 1, P. 899-901

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.