Twin Sister Mine

The Twin Sister Mine is a gold mine located in Boise county, Idaho at an elevation of 4,800 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: Twin Sister Mine  

State:  Idaho

County:  Boise

Elevation: 4,800 Feet (1,463 Meters)

Primary Mineral: Gold

Lat, Long: 43.9108, -115.88280

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 Twin Sister Mine

Twin Sister Mine MRDS details

Site Name

Primary: Twin Sister Mine


Commodity

Primary: Gold
Tertiary: Antimony
Tertiary: Lead
Tertiary: Zinc


Location

State: Idaho
County: Boise
District: Idaho City


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

Not available


Production

Not available


Deposit

Record Type: Site
Operation Category: Past Producer
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: Sawtooth Mountains


Mineral Deposit Model

Not available


Orebody

Form: LENSES


Structure

Not available


Alterations

Alteration Type: L
Alteration Text: Fe Stains, Scorodite


Rocks

Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock
Age Young: Late Cretaceous

Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Cretaceous

Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous


Analytical Data

Not available


Materials

Ore: Sphalerite
Ore: Galena
Gangue: Quartz
Gangue: Pyrite


Comments

Comment (Location): NEAR THE HEAD OF MILL CR.

Comment (Production): $50,000 OF AU (?) ORE IN THE EARLY DAYS PLUS 1,000 TONS ORE IN 1934.


References

Reference (Production): ANDERSON, A. L. 1947. USGS BULL. 944 - C, P. 242.

Reference (Deposit): 1947 GEOLMAP ANDERSON, A. L., BULL. 944 -

Reference (Deposit): ANDERSON, ALFRED L., 1947, GEOLOGY AND ORE DEPOSITS OF BOISE BASIN, IDAHO, U. S. GEOL. SUR. BULL. 944 - C, P. 242


Idaho Gold

Where to Find Gold in Idaho

"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 at Where to Find Gold in Idaho.