| Deposit ID | 10071675 |
|---|---|
| MRDS ID | W015189 |
| MAS/MILS ID | 0160590034 |
| Record type | Site |
| Current site name | Twilight Mine |
| Alternate or previous names | Sawlog Group |
| Geographic coordinates: | -114.20063, 45.38849 (WGS84) |
|---|---|
| Elevation | 1219 |
| Relative position | 1.75 MI SW OF INDIANOLA RANGER STATION |
Political divisions (FIPS codes)
Lemhi(county)
Idaho(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Ulysses(quadrangle 1:24,000 scale)
Bighorn Crags(quadrangle 1:100,000 scale)
Elk City(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Middle Salmon-Panther(hydrologic unit)
Salmon(hydrologic accounting unit)
Lower Snake(hydrologic subregion)
Pacific Northwest(hydrologic region)
Federal lands
Salmon-Challis National Forest(National Forest)
National Forest FS(Type of land area)
FS(Federal land areas administered by FS)
| Country | State | County |
|---|---|---|
| United States | Idaho | Lemhi |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Boise | 024N | 019E | 23,26 | Idaho |
| Commodity | Importance |
|---|---|
| Gold | Primary |
| Lead | Tertiary |
| REE Critical | Tertiary |
| Thorium | Tertiary |
| Silver | Tertiary |
| Materials | Type of material |
|---|---|
| Galena | Ore |
| Monazite | Ore |
| Magnetite | Gangue |
| Orthoclase | Gangue |
| Pyrite | Gangue |
| Quartz | Gangue |
| Result | GEIGER COUNTER READINGS 1.5 TIMES BACKGROUND DUE TO THE THORIUM IN MINOR AMOUNTS OF MONAZITE |
|---|
| Host or associated | Associated | ||||
|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Pegmatite | ||||
| Rock type qualifier | Dike | ||||
| Rock description | Dike-Pegmatite | ||||
| |||||
| Host or associated | Host | ||||
|---|---|---|---|---|---|
| Rock type | Metamorphic Rock > Gneiss | ||||
| Rock type qualifier | Augen Gneiss | ||||
| Rock unit name | Belt Supergroup | ||||
| Rock description | Belt Supergroup-Augen Gneiss And Schist | ||||
| |||||
| Host or associated | Host |
|---|---|
| Rock type | Metamorphic Rock > Schist |
| Rock unit name | Belt Supergroup |
| (1) | Augen gneiss. |
|---|
| Type of structure | Local |
|---|---|
| Structure name | Faulting |
| Type of structure | Local |
| Structure name | Slickensides |
| Type of structure | Local |
| Structure name | Displacement |
| Development status | Past Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| District name | North Fork - Shoup District |
|---|
| Ownership category | National Forest |
|---|---|
| Area name | Salmon National Forest |
| Type | Owner |
|---|---|
| Owner | Magnuson Bevan |
| Type of workings | Underground |
|---|---|
| Length | 60.96M |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | W015189 | |
| Idaho Geological Survey | Idaho Mines and Prospects | IMP | EC1119 | http://www.idahogeology.org/ |
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0160590034 | data consolidated into this record |
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.
Sturm, F. H., 1954, Univ. Of Idaho, M. S. Thesis.
Trites, A. F., And Tooker, E. W., 1953 , Uranium And Thorium Deposits In East - Central Idaho, Southwestern Montana: USGS Bulletin 988-H, P. 170
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-MAR-1975 | Miller, Pat J. | U.S. Geological Survey | |
| Reporter | 13-OCT-1990 | Western Field Operations Center (WFOC) | U.S. Bureau of Mines |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.