| Deposit ID | 10048512 |
|---|---|
| MRDS ID | MP00101 |
| Record type | Site |
| Current site name | Frog Pond West |
| Alternate or previous names | J-M Reef |
| Geographic coordinates: | -110.13913, 45.45436 (WGS84) |
|---|---|
| Elevation | 2728 |
| Relative position | ABOUT 1 MI NORTHWEST OF SUMMIT OF CHROME MOUNTAIN |
Political divisions (FIPS codes)
Sweet Grass(county)
Montana(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Chrome Mountain(quadrangle 1:24,000 scale)
Gardiner(quadrangle 1:100,000 scale)
Bozeman(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Upper Yellowstone(hydrologic unit)
Upper Yellowstone(hydrologic accounting unit)
Upper Yellowstone(hydrologic subregion)
Missouri(hydrologic region)
Federal lands
Custer Gallatin National Forest(National Forest)
National Forest FS(Type of land area)
FS(Federal land areas administered by FS)
| Country | State | County |
|---|---|---|
| United States | Montana | Sweet Grass |
| Commodity | Importance |
|---|---|
| Platinum Critical | Primary |
| Palladium Critical | Primary |
| Rhodium Critical | Primary |
| Gold | Secondary |
| Copper | Secondary |
| Nickel Critical | Secondary |
| Materials | Type of material |
|---|---|
| Chalcopyrite | Ore |
| Pentlandite | Ore |
| Pyrite | Ore |
| Pyrrhotite | Ore |
| Apatite | Gangue |
| Chlorite | Gangue |
| Hornblende | Gangue |
| Magnetite | Gangue |
| Olivine | Gangue |
| Phlogopite | Gangue |
| Plagioclase | Gangue |
| Pyroxene | Gangue |
| Serpentine | Gangue |
| Talc | Gangue |
| Tremolite | Gangue |
| Model code | 4 |
|---|---|
| USGS model code | 2b |
| Deposit model name | Merensky Reef PGE |
| Host or associated | Host | ||||
|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Mafic Intrusive Rock > Gabbro > Norite | ||||
| |||||
| Host or associated | Host |
|---|---|
| Rock type | Plutonic Rock > Mafic Intrusive Rock > Gabbro > Troctolite |
| Host or associated | Host |
|---|---|
| Rock type | Plutonic Rock > Mafic Intrusive Rock > Anorthosite |
| Host or associated | Host |
|---|---|
| Rock type | Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Harzburgite |
| (1) | -110.13913, 45.45436 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | The Stillwater Complex Is Exposed Along The Northern Margin Of The Beartooth Uplift, One Of Several Laramide Basement-Cored Ranges That Make Up The Rocky Mountain Foreland Of South-Central Montana (Foose And Others, 1961: Kulik And Schmidt, 1988) |
| General form | STRATIFORM, DISSEMINATED |
|---|
| Development status | Occurrence |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| District name | In Stillwater Complex |
|---|
| Ownership category | National Forest |
|---|
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | MP00101 |
ZIENTEK, M.L., 1993, MINERAL RESOURCE APPRAISAL FOR LOCATABLE MINERALS: THE STILLWATER COMPLEX, IN HAMMARSTROM, J.M., ZIENTEK, M.L., AND ELLIOTT, J.E., EDS., MINERAL RESOURCE ASSESSMENT OF THE ABSAROKA-BEARTOOTH STUDY AREA, CUSTER AND GALLATIN NATIONAL FORESTS, MONTANA: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 93-207, P. F1-F83.
SEGERSTROM, KENNETH, AND CARLSON, R.R., 1982, GEOLOGIC MAP OF THE BANDED UPPER ZONE OF THE STILLWATER COMPLEX AND ADJACENT ROCKS, STILLWATER, SWEET GRASS, AND PARK COUNTIES, MONTANA: U.S. GEOLOGICAL SURVEY MISCELLANEOUS GEOLOGIC INVESTIGATIONS MAP I-1383, SCALE 1:24,000.
| Subject category | Comment text |
|---|---|
| Deposit | THE J-M REEF IS 400-500 M ABOVE THE BASE OF BANDED SERIES THE IN BASAL PART OF ANORTHOSITE I SUBZONE OF TROCTOLITE-ANORTHOSITE ZONE I. THIS COINCIDES WITH THE REAPPEARANCE OF OLIVINE IN THE CRYSTALLIZATION SEQUENCE. |
| Deposit | SEE ALSO: MRDS MP00087. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-OCT-1991 | Peterson, Jocelyn A. | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.