| Deposit ID | 10221786 |
|---|---|
| MAS/MILS ID | 0300970002 |
| Record type | Site |
| Current site name | Stillwater Anorthosite |
| Alternate or previous names | Stillwater Complex |
| Point of reference | Ore Body |
|---|---|
| Geographic coordinates: | -110.0727, 45.46162 (WGS84) |
| Elevation | 2740 |
| Location accuracy | 10(meters) |
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)
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 | 004 S | 013 E | 25 | Montana |
| Commodity | Importance |
|---|---|
| Aluminum Critical | Primary |
| Calcium | Tertiary |
| Iron | Tertiary |
| Magnesite | Tertiary |
| Silica | Tertiary |
| Sodium | Tertiary |
| Materials | Type of material |
|---|---|
| Bytownite | Unknown |
| Enstatite | Unknown |
| Olivine | Unknown |
| Ore Body (1) | -110.0727, 45.46162 |
|---|
| Strike | N70W | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dip | 75N | ||||||||||||||||||||||||||||
| Thickness | 1200M | ||||||||||||||||||||||||||||
| Length | 14500M | ||||||||||||||||||||||||||||
| Width | 350M | ||||||||||||||||||||||||||||
| Area | 4625HA | ||||||||||||||||||||||||||||
| Depth to top | 0M | ||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||
| Operation type | Surface |
|---|---|
| Development status | Prospect |
| Commodity type | Both |
| Significant | No |
| Discovery year | 1916 |
| District name | Stillwater |
|---|
| Type of mineral rights | Federal Lease |
|---|---|
| Type of mineral rights | Located Claim |
| Type of mineral rights | Patented |
| Ownership category | National Forest |
|---|
| Type | Owner |
|---|---|
| Owner | Anaconda Co. |
| Home office | New York |
| Year | 1977 |
| Type | Owner |
|---|---|
| Owner | Amax, Inc. |
| Home office | Connecticut |
| Year | 1977 |
| Type | Owner |
|---|---|
| Owner | Cyprus Mines |
| Home office | California |
| Year | 1977 |
| Type | Owner |
|---|---|
| Owner | Johns-Manville Products Corp. |
| Home office | Colorado |
| Year | 1977 |
| Type | Owner |
|---|---|
| Owner | National Forest |
| Home office | Dist Of Columbia |
| Year | 1977 |
| Type | In-situ | |||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1967 | |||||||||||||||||||||||||||||||||||
| Inferred | 4100000000mt ore | |||||||||||||||||||||||||||||||||||
| Total resources | 8300000000mt ore | |||||||||||||||||||||||||||||||||||
| ||||||||||||||||||||||||||||||||||||
| Type of workings | Surface | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Area | 4625HA | ||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0300970002 |
HESS, H.H. STILLWATER IGNEOUS COMPLEX, MONTANA. GEOL.
SOC. AM. MEM. 80, 1960, 230 PP.
FENTON, M.D. AND G. FAURE. THE AGE OF IGNEOUS ROCKS
OF THE STILLWATER COMPLEX. GEOL. SOC. AMER. BULL.
V. 80, 1969, PP. 1599-1604.
JONES, W.R., J.W. PEOPLES, AND A.L. HOWLAND. IGNEOUS
AND TECTONIC STRUCTURES OF THE STILLWATER COMPLEX,
MONTANA. U.S. GEOLOGICAL SURVEY BULL. 1071-W, 1960, PP. 281-340
ST. CLAIR, H.W., D.A. ELKINS, B.K. SHIBLER, W.M. MAHAN,
R.C. MERRITT, M.R. HOWCROFT, AND M. HAYASHI. OPERATION
OF EXPERIMENTAL PLANT FOR PRODUCING ALUMINA FROM
ANORTHOSITE. BUMINES BULL. 577, 1959, 127 PP.
TURNER, F.J., AND J. VERHOOGEN. IGNEOUS AND METAMORPHIC
PETROLOGY; 2ND ED.. MCGRAW HILL BOOK CO., PUB., 1960,
PP. 300-302.
U.S. BUREAU OF MINES IC 8335, P. 86-87, 1967.
U.S. GEOLOGICAL SURVEY CIRCULAR 684, P. 6.
| Subject category | Comment text |
|---|---|
| Deposit | NOTE: DEPOSIT EXTENDS INTO ADJACENT STILLWATER COUNTY. THE BULK OF THE DEPOSIT IS IN SWEET GRASS COUNTY. THE COST INFORMATION CONTAINED IN THIS FILE IS INADEQUATE AND AND WILL REMAIN SO UNTIL ANORTHOSITE DEPOSITS CAN BE EVALUATED FURTHER. THERE ARE TWO SETS OF COSTS; ORIGINAL 1975 COSTS, AND COMPLETELY RECOSTED 1979 COSTS. ALL COSTS ARE ASSUMED TO BE MIDYEAR. DEPOSIT LIFE IS 2947 YEARS AT H PRODUCTION RATE OF 1,357,000 TONNES PER YEAR. THE MILL CAPACITY CAN BE INCREASED TO SHORTEN THE LIFE, OR OTHER MILLS CAN BE ADDED SUBSEQUENTLY OR CONCURRENTLY. THERE IS ENOUGH MATERIAL TO SUPPLY 117 SUCH PLANTS FOR 25 YEARS AND ONE PLANT FOR 22 YEARS. STRATIFORM ANORTHOSITE BODIES 1400 FT THICK, 17 TO 26 MILES LONG. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 19-MAY-98 | McHugh, Edward L. | U.S. Bureau of Mines |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
MRDS records operators as of each record's last update (≤ 2019). Some of the operators listed here have since changed hands or dissolved:
Curated by qvyshift.com from publicly-reported M&A activity (SEC filings, press releases, USGS Mineral Yearbooks). Not authoritative — verify against primary sources before relying on it. The MSHA panel above is the current authoritative source for actively-permitted mines.