| Deposit ID | 10042340 |
|---|---|
| MRDS ID | M060092 |
| Record type | Site |
| Current site name | East Boulder Plateau |
| Alternate or previous names | Champion Group, Chrome Mountain |
| Related records | 10197741 |
| Geographic coordinates: | -110.12886, 45.44075 (WGS84) |
|---|---|
| Elevation | 2880 |
| Relative position | 25 AIR MI SOUTHEAST OF LIVINGSTON. ABOUT 0.5 MI EAST 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 |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Montana Principal | 005S | 013E | 32,33 | Montana |
| Commodity | Importance |
|---|---|
| Chromium Critical | Primary |
| Platinum Critical | Secondary |
| Palladium Critical | Secondary |
| Rhodium Critical | Secondary |
| Materials | Type of material |
|---|---|
| Chromite | Ore |
| Olivine | Gangue |
| Result | 7 TRENCH SAMPLES AT 0.9-2.5 FT: 1.65-34.7% CR2O3, AVERAGE 2.8 FT AT 16.8% CR2O3. MAX. OF 2 ANALYSES: 2.7 PPM PT, 5.76 PPM PD, 0.3 PPM RH. AVERAGE CHROMITITE: 74.2 PPB PT, 103.8 PPB PD, 63.4 PPB RH. |
|---|
| Model code | 2 |
|---|---|
| USGS model code | 2a |
| Deposit model name | Bushveld Cr |
| Host or associated | Host | ||||
|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Harzburgite | ||||
| |||||
| (1) | -110.12886, 45.44075 |
|---|
| 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) |
| Type of structure | Local |
| Structure description | Strike-Slip Fault And Cross-Faults |
| General form | MASSIVE BAND, DISSEMINATED |
|---|---|
| Strike | NW |
| Dip | RELATIVELY FLAT BUT HIGHLY VARIABLE |
| Length | 304.8M |
| Depth to top | 0M |
| Development status | Occurrence |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1940 |
| District name | In Stillwater Complex |
|---|
| Ownership category | National Forest |
|---|
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | M060092 |
WIMMLER, N.L., 1948, INVESTIGATION OF CHROMITE DEPOSITS OF THE STILLWATER COMPLEX, STILLWATER AND SWEETGRASS COUNTIES, MONTANA: U.S. BUREAU OF MINES REPORT OF IVESTIGATIONS 4368, P. 40-41.
HOWLAND, A.L., 1955, CHROMITE DEPOSITS IN THE CENTRAL PART OF THE STILLWATER COMPLEX, SWEET GRASS COUNTY, MONTANA: U.S. GEOLOGICAL SURVEY BULLETIN 1015-D, P. 110-112.
HOWLAND, A.L., GARRELS, E.M., AND JONES, W.R., 1949, CHROMITE DEPOSITS OF BOULDER RIVER AREA, SWEETGRASS COUNTY, MONTANA: U.S. GEOLOGICAL SURVEY BULLETIN 948-C, P. 74.
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.
1955 GEOLMAP HOWLAND, BULL 1015-D, P. 110
| Subject category | Comment text |
|---|---|
| Deposit | MAIN LAYER IS G CHROMITITE. MASSIVE ORE AVERAGES 1 FT THICK; DISSEMINATED ORE AVERAGES 1 FT THICK. THERE ARE SEVERAL BANDS AND STRINGERS LESS THAN 1 FT THICK. BANDS ARE OFFSET BY FAULTS. CHROMITE IS INTERMITTENTLY EXPOSED IN OUTCROP |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-JAN-1973 | Dohrenwend, John C. | U.S. Geological Survey | |
| Updater | 01-FEB-1980 | Doyle, Brien (Wells, John) | U.S. Geological Survey | |
| Updater | 01-AUG-1991 | Peterson, Jocelyn A. | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.