| Deposit ID | 10048513 |
|---|---|
| MRDS ID | MP00102 |
| Record type | Site |
| Current site name | West Fork East Adit |
| Alternate or previous names | J-M Reef |
| Geographic coordinates: | -109.96885, 45.39881 (WGS84) |
|---|---|
| Elevation | 2027 |
| Location accuracy | 100(meters) |
| Relative position | ABOUT 3.4 MI WEST-NORTHWEST OF MOUNTAIN VIEW LAKE, Acc West Fork Adit |
Political divisions (FIPS codes)
Sweet Grass(county)
Montana(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Meyer Mountain(quadrangle 1:24,000 scale)
Red Lodge(quadrangle 1:100,000 scale)
Billings(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Stillwater(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 | Tertiary |
| Nickel Critical | Tertiary |
| 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 |
| Result | AVERAGE GRADE OF 14.7 PPM PT+PD, 0.15% CU+NI ACROSS 1.9 M OVER A STRIKE LENGTH OF 657 M. PT:PD=3.5 |
|---|
| 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) | -109.96885, 45.39881 |
|---|
| 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 |
| Discovery year | 1967 |
| Discoverer | Johns-Manville |
| District name | In Stillwater Complex |
|---|
| Ownership category | National Forest |
|---|
| Type | Operator |
|---|---|
| Owner | Johns-Manville Products Corp. |
| First year | 1977 |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | MP00102 |
CONN, 1979
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.
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.
CONN, H.K., 1979, THE JOHNS-MANVILLE PLATINUM-PALLADIUM PROSPECT, STILLWATER COMPLEX, MONTANA, U.S.A.: CANADIAN MINERALOGIST, V. 17, P. 463-468.
| Subject category | Comment text |
|---|---|
| Deposit | THE J-M REEF IS 400-450 M ABOVE THE BASE OF THE BANDED SERIES IN BASAL PART OF ANORTHOSITE I SUBZONE OF TROCTOLITE-ANORTHOSITE ZONE I. THIS COINCIDES WITH THE REAPPEARANCE OF OLIVINE IN THE CRYSTALLIZATION SEQUENCE. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-OCT-91 | Peterson, Jocelyn A. | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.