| Deposit ID | 10048025 |
|---|---|
| MRDS ID | M700433 |
| Record type | Site |
| Current site name | Iron Mountain-Chrome Group W |
| Alternate or previous names | Chrome Group |
| Geographic coordinates: | -110.05136, 45.4077 (WGS84) |
|---|---|
| Elevation | 2880 |
| Location accuracy | 100(meters) |
| Relative position | 30 AIR MI SOUTHEAST OF LIVINGSTON. ABOUT 1.2 MI SOUTH OF SOUTH PICKET PIN LAKE, Acc Generalized Location, Near Trench 275 |
Political divisions (FIPS codes)
Sweet Grass(county)
Montana(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Picket Pin Mountain(quadrangle 1:24,000 scale)
Gardiner(quadrangle 1:100,000 scale)
Bozeman(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 |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Montana Principal | 005S | 014E | 18 | Montana |
| Materials | Type of material |
|---|---|
| Chromite | Ore |
| Olivine | Gangue |
| Serpentine | Gangue |
| Result | TRENCHES YIELEDED 0.5-5 FT CHROMITE AT 3.33-39.57% CR2O3 (AVERAGE 2.65 FT AT 17.9% CR2O3). 1 SAMPLE OF CHROMITITE: 71 PPB PT, 270 PPB PD, 40 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) | -110.05136, 45.4077 |
|---|
| 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 | Cross-Faulting |
| General form | MASSIVE BAND, DISSEMINATED |
|---|---|
| Dip | 65-75 N |
| Thickness | 0.3M |
| Length | 121.92M |
| 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 | M700433 |
WIMMLER, N.L., 1948, INVESTIGATION OF CHROMITE DEPOSITS OF THE STILLWATER COMPLEX, STILLWATER AND SWEETGRASS COUNTIES, MONT.: U.S. BUREAU OF MINES REPORT OF INVESTIGATIONS 4368, P. 38-39.
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. 113-114.
SCHAFER, P.A., 1937, CHROMITE DEPOSITS OF MONTANA: MONTANA BUREAU OF MINES AND GEOLOGY MEMOIR 18, P. 14-16.
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. 11
| Subject category | Comment text |
|---|---|
| Deposit | CHROMITITE A AND G LAYERS ARE PRESENT. MAXIMUM GIVEN IS MASSIVE ORE; DISSEMINATED ORE IS 3.5 FT MAX. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-JAN-73 | Dohrenwend, John C. | U.S. Geological Survey | |
| Updater | 01-FEB-80 | Doyle, Brien (Wells, John) | U.S. Geological Survey | |
| Updater | 01-AUG-91 | Peterson, Jocelyn A. | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.