The Twilight Mine is a gold mine located in Lemhi county, Idaho at an elevation of 3,999 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: 3,999 Feet (1,219 Meters)
Commodity: Gold
Lat, Long: 45.3886, -114.19970
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.
Twilight Mine MRDS details
Site Name
Primary: Twilight Mine
Secondary: Sawlog Group
Commodity
Primary: Gold
Tertiary: Silver
Tertiary: Lead
Tertiary: REE
Tertiary: Thorium
Location
State: Idaho
County: Lemhi
District: North Fork - Shoup 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: Magnuson Bevan
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: 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
Type: L
Structure: Displacement
Type: L
Structure: Slickensides
Type: L
Structure: Faulting
Alterations
Alteration Type: L
Alteration: Leaching
Alteration Type: L
Alteration: Sericite
Rocks
Name: Gneiss
Role: Host
Description: Augen Gneiss
Age Type: Host Rock
Age Young: Pliocene
Name: Gneiss
Role: Host
Description: Augen Gneiss
Age Type: Host Rock Unit
Age Young: Neoproterozoic
Name: Pegmatite
Role: Associated
Description: Dike
Age Type: Associated Rock Unit
Age Young: Pliocene
Name: Pegmatite
Role: Associated
Description: Dike
Age Type: Associated Rock
Age Young: Pliocene
Analytical Data
Analytical Data: GEIGER COUNTER READINGS 1.5 TIMES BACKGROUND DUE TO THE THORIUM IN MINOR AMOUNTS OF MONAZITE
Materials
Ore: Galena
Ore: Monazite
Gangue: Pyrite
Gangue: Orthoclase
Gangue: Magnetite
Gangue: Quartz
Comments
Comment (Development): 5 - Ton Ball Mill; Total Of 7 Claims Worked By M. Bevan.
Comment (Location): Along Saw Log Gulch, .75 Of A Mi S Of Salmon R. & 10 Mi W Of North Fork, Idaho
Comment (Geology): Original Structures entry: Local - Faulting, Slickensides, Displacement
Comment (Geology): Original alteration entry: Local - Sericite; Leaching
References
Reference (Deposit): Sturm, F. H., 1954, General Geology Of Some Replacement Monazite Deposits In Lemhi County, Idaho: Moscow, Idaho, Univ. Of Idaho, M.S. Thesis, 64 P.
Reference (Deposit): Trites, A. F., And Tooker, E. W., 1953 , Uranium And Thorium Deposits In East - Central Idaho, Southwestern Montana: USGS Bulletin 988-H, P. 170
Reference (Production): Sturm, F. H., 1954, Univ. Of Idaho, M. S. Thesis.
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.
