| Deposit ID | 10069281 |
|---|---|
| MRDS ID | W002871 |
| Record type | Site |
| Current site name | Elkhorn |
| Geographic coordinates: | -111.95087, 46.28323 (WGS84) |
|---|---|
| Elevation | 1981 |
| Relative position | 9 MILES EAST OF BOULDER |
Political divisions (FIPS codes)
Jefferson(county)
Montana(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Elkhorn(quadrangle 1:24,000 scale)
Townsend(quadrangle 1:100,000 scale)
White Sulphur Springs(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Boulder(hydrologic unit)
Missouri Headwaters(hydrologic accounting unit)
Missouri Headwaters(hydrologic subregion)
Missouri(hydrologic region)
Federal lands
Beaverhead-Deerlodge National Forest(National Forest)
National Forest FS(Type of land area)
FS(Federal land areas administered by FS)
| Country | State | County |
|---|---|---|
| United States | Montana | Jefferson |
| Commodity | Importance |
|---|---|
| Silver | Primary |
| Gold | Primary |
| Lead | Primary |
| Copper | Primary |
| Bismuth Critical | Secondary |
| Materials | Type of material |
|---|---|
| Bismuthinite | Ore |
| Bournonite | Ore |
| Galena | Ore |
| Magnetite | Ore |
| Pyrite | Ore |
| Sphalerite | Ore |
| Tetradymite | Ore |
| Tetrahedrite | Ore |
| Aragonite | Gangue |
| Diopside | Gangue |
| Dolomite | Gangue |
| Quartz | Gangue |
| Serpentine | Gangue |
| Result | 10-25 OZ/TON AG, 34-64% PB. |
|---|
| Host or associated | Host | ||
|---|---|---|---|
| Rock type | Sedimentary Rock > Carbonate > Limestone | ||
| Rock unit name | Turnley Formation, Metamorphosed Shale;;Limestones, Shale;Madison Formation, Limestone; Quadrant Formation, Quartzite | ||
| Rock description | Turnley Formation, Metamorphosed Shale;;Limestones, Shale;Madison Formation, Limestone; Quadrant Formation, Quartzite | ||
| |||
| (1) | -111.95087, 46.28323 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Boulder Batholith |
| Type of structure | Local |
| Structure description | Extensive Folding Axis N-S With Prevailing Eastward Dip. |
| General form | IRREGULAR |
|---|---|
| Thickness | 48.77M |
| Development status | Past Producer |
|---|---|
| Commodity type | Metallic |
| Significant | No |
| Discovery year | 1875 |
| Year of first production | 1875 |
| District name | Elkhorn |
|---|
| Type of workings | Underground |
|---|---|
| Length | 701.04M |
| Overall depth | 533.4M |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | W002871 |
WEED, W.H., 1901, GEOLOGY AND ORE DEPOSITS OF THE ELKHORN MINING DISTRICT, JEFFERSON CO., MONTANA, 22 ANN. REPT. USGS P. 399-549
KNOPF, A., 1913, ORE DEPOSITS OF THE HELENA MINING REGION, MONTANA USGS BULL. 527. P. 128-139.
PARDEE, J. T. AND F. C. SCHRADER, 1933, METALLIFEROUS DEPOSITS OF THE GREATER HELENA MINING REGION, USGS BULL. 842 P. 299-303.
1901 GEOLMAP WEED, W.H., COMPLEX GEOLOGIC INVESTIGATION
1913 COMPILE KNOPF, A.
1933 COMPILE PARDEE & SCHRADER
PARDEE & SCHRADER
| Subject category | Comment text |
|---|---|
| Deposit | IN ELKHORN MINE THERE IS A COMPLETE ABSENCE OF METASOMATIC GANGUE MINERALS. |
| Deposit | BIGGEST MINES: PLACK BESS, CARDIFF, EMMA LOOK FOR FAULT PATTERNS ON IMAGERY; NS, EW, ENE. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-MAR-1975 | Bilbey, Sue A. | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.