| Deposit ID | 10048658 |
|---|---|
| MRDS ID | MP00270 |
| Record type | Site |
| Current site name | Mouat Ni-Cu South |
| Alternate or previous names | South Mouat Area |
| Geographic coordinates: | -109.89996, 45.37686 (WGS84) |
|---|---|
| Elevation | 2042 |
| Relative position | ABOUT 0.6 MI SOUTH OF MOUNTAIN VIEW LAKE |
Political divisions (FIPS codes)
Stillwater(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 | Stillwater |
| Commodity | Importance |
|---|---|
| Nickel Critical | Primary |
| Copper | Primary |
| Cobalt Critical | Secondary |
| PGE Critical | Tertiary |
| Silver | Tertiary |
| Gold | Tertiary |
| Materials | Type of material |
|---|---|
| Chalcopyrite | Ore |
| Pentlandite | Ore |
| Pyrrhotite | Ore |
| Magnetite | Gangue |
| Olivine | Gangue |
| Plagioclase | Gangue |
| Result | SEE RESERVE/RESOURCE DATA. MEDIAN (AND MAXIMUM) PT, PD, AND RH CONTENTS IN PPB OF DIFFERENT ORE TYPES WITHIN THE MOUAT DEPOSIT (ZIENTEK AND OTHERS, 1986 |
|---|---|
| Result | ZIENTEK, 1993 |
| Result | UNPUB DATA): BASAL SERIES: DISSEMINATED ORE PT=7.15 (140), PD=15 (78), RH=1 (2) |
| Result | NET-TEXTURED ORE PT=3.3 (62), PD=13 (83), RH=8.1 (18). STILLWATER-ASSOCIATED SILLS AND DIKES (MAFIC NORITE): DISSEMINATED ORE PT=7.55 (24), PD=7.5 (18), RH=0.6 (7) |
| Result | NET-TEXTURED ORE PT=4.2 (49), PD=14.5 (130), RH=1 (9) |
| Result | MASSIVE ORE PT=3.05 (150), PD=22 (410), RH=1.3 (9). STILLWATER-ASSOCIATED SILLS AND DIKES (GABBRONORITE): DISSEMINATED ORE PT=5.0 (960), PD=9.2 (340), RH=0.8 (5). |
| Model code | 1 |
|---|---|
| USGS model code | 1 |
| Deposit model name | Stillwater Ni-Cu |
| Host or associated | Host |
|---|---|
| Rock type | Plutonic Rock > Ultramafic Intrusive Rock > Peridotite |
| Rock unit name | Stillwater Complex, Ultramafic Series, Peridotite Zone;Stillwater Complex, Basal Series;Stillwater Complex; |
| Rock description | Stillwater Complex, Ultramafic Series, Peridotite Zone;Stillwater Complex, Basal Series;Stillwater Complex; |
| (1) | -109.89996, 45.37686 |
|---|
| 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 | See Deposit Description |
| General form | LENTICULAR TO TABULAR CONCENTRATIONS OF SUFLIDE MINERALS |
|---|
| Development status | Occurrence |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1967 |
| District name | In Stillwater Complex |
|---|
| Ownership category | Private |
|---|
| Type | Operator |
|---|---|
| Owner | Anaconda Co. |
| First year | 1970 |
| Type | In-situ | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1978 | |||||||||||||||||||||
| Total resources | 65000mt ore | |||||||||||||||||||||
| ||||||||||||||||||||||
| Type | In-situ | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1987 | |||||||||||||||||||||
| Total resources | 11000mt ore | |||||||||||||||||||||
| ||||||||||||||||||||||
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | MP00270 |
ATTANASI, E.D., AND BAWIEC, W.J., 1987, A RESOURCE ASSESSMENT OF COPPER AND NICKEL SULFIDES WITHIN THE MOUNTAIN VIEW AREA, STILLWATER COMPLEX, MONTANA: U.S. GEOLOGICAL SURVEY BULLETIN 1674B, 29 P.
PAGE, N.J, ZIENTEK, M.L., LIPIN, B.R., MANN, E.L. (BOB), SCHMIDT, E.A., TURNER, A.R., CZAMANSKE, G.K., AND RAEDEKE, L.D., 1985B, EXPLORATION AND MINING HISTORY OF THE STILLWATER COMPLEX AND ADJACENT ROCKS, IN CZAMANSKE, G.K., AND ZIENTEK, M.L., EDS., THE STILLWATER COMPLEX, MONTANA: GEOLOGY AND GUIDE: MONTANA BUREAU OF MINES AND GEOLOGY SPECIAL PUBLICATIONS 92, P. 77-92.
PAGE, N.J, ZIENTEK, M.L., LIPIN, B.R., RAEDEKE, L.D., WOODEN, J.L., TURNER, A.R., LOFERSKI, P.J., FOOSE, M.P., MORING, B.C., AND RYAN, M.P., 1985A, GEOLOGY OF THE STILLWATER COMPLEX EXPOSED IN THE MOUNTAIN VIEW AREA AND ON THE WEST SIDE OF THE STILLWATER CANYON, IN CZAMANSKE, G.K., AND ZIENTEK, M.L., EDS., THE STILLWATER COMPLEX, MONTANA: GEOLOGY AND GUIDE: MONTANA BUREAU OF MINES AND GEOLOGY SPECIAL PUBLICATION 92, P. 147-209.
PAGE, N.J, AND NOKLEBERG, W.J., 1974, GEOLOGIC MAP OF THE STILLWATER COMPLEX, MONTANA: U.S. GEOLOGICAL SURVEY MISCELLANEOUS GEOLOGIC INVESTIGATIONS SERIES MAP I-797, 5 SHEETS, SCALE 1:12,000.
ZIENTEK, M.L., BAWIEC, W.J., PAGE, N.J, AND COOPER, R.W., 1989, MAPS, SECTIONS, AND STRUCTURE-CONTOUR PERSPECTIVE DIAGRAMS SHOWING THE GEOLOGY AND GEOCHEMISTRY OF THE MOUAT NICKEL-COPPER PROSPECT, STILLWATER COMPLEX, STILLWATER COUNTY, MONTANA: U.S. GEOLOGICAL SURVEY MISCELLANEOUS FIELD STUDIES MAP MF-2038, 2 SHEETS, SCALE 1:24,000.
ZINETEK, 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 ABASROKA-BEARTOOTH STUDY AREA, CUSTER AND GALLATIN NATIONAL FORESTS, MONTANA: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 93-207, P. F1-F83.
SOUTH MOUAT AREA RESOURCE ESTIMATES ARE FROM ATTANASI AND BAWIEC (1987) AND WERE MADE ON TWO DOMAINS; THE FIRST FOUR ESTIMATES ABOVE FROM ONE DOMAIN AND THE LAST OUR FROM THE OTHER DOMAIN
| Subject category | Comment text |
|---|---|
| Deposit | ORE CONSISTS OF DISSEMINATED, MATRIX, AND MASSIVE CONCENTRATIONS OF MAGMATIC SULFIDES IN LENSES AND TABULAR BODIES IN MAFIC AND ULTRAMAFIC INTRUSIONS NEAR THE MARGIN OF THE STILLWATER COMPLEX. SULFIDE MINERALIZATION THAT CONSTITUTES THE MOUAT DEPOSIT LIES NEAR THE BASE OF THE STILLWATER COMPLEX WEST OF THE STILLWATER RIVER. THE HOST ROCKS LIE BETWEEN TWO SOUTH-DIPPING, HIGH-ANGLE REVERSE FAULTS, THE LAKE FAULT ON THE NORTH AND THE BLUEBIRD THRUST ON THE SOUTH. LAYERED ROCKS OF THE STILLWATER COMPLEX ARE FOLDED INTO A BROAD SYNCLINE BETWEEN THESE TWO FAULTA AND, IN THE AREA OF THE CU-NI SULFIDE DEPOSITS, GENERALLY DIP 60 DEGREES NORTHWEST. BETWEEN THE TWO HIGH-ANGLE REVERSE FAULTS, THE DEPOSIT IS CUT BY AN OLDER SET OF FAULTS THAT STRIKE NORTHEAST AND HAVE NEAR VERTICAL DIPS AND A YOUNDER SET OF NORTHWEST-STRIKING, NEAR VERTICAL FAULTS THAT SHOW LEFT-LATERAL DISPLACEMENT. THE MOUAT DEPOSIT CAN BE SUBDIVIDED INTO TWO PARTS, A NORTHERN BLOCK THAT LIES NORTH OF VERDIGRIS CREEK (SEE |
| Deposit | RECORD M060102) AND A SOUTHERN PART THAT LIES SOUTH OF VERDIGRIS CREEK (THIS RECORD). MINERALIZED ROCKS SOUTH OF VERDIGRIS CREEK ARE ALMOST COMPLETELY COVERED BY GLACIAL DEPOSITS; DRILLING HAS SHOWN THAT SULFIDE MINERALIZATION OCCURS BOTH IN THE BASAL SERIES (AND TO A LESSER EXTENT THE PERIDOTITE ZONE) OF THE STILLWATER COMPLEX AND IN STILLWATER-ASSOCIATED SILLS AND DIKES THAT INTRUDE THE METAMORPHOSED SEDIMENTARY ROCKS BELOW THE BASE OF THE STILLWATER COMPLEX. THE MINERALIZED SILLS AND DIKES ARE LESS COMMON AND ARE SMALLER THAN THOSE IN THE AREA NORTH OF VERDIGRIS CREEK. SEE PAGE AND OTHERS (1985A), PAGE AND NOKLEBERG (1974), ZIENTEK AND OTHERS (1989). |
| Deposit | METALLURGICAL STUDIES BY ANACONDA INDICATED THAT BULK SULFIDE FLOTATION PRODUCED A LOW-GRADE CONCENTRATE WITH GOOD RECOVERY; HOWEVER, THIS CONCENTRATE WAS UNSUITABLE FOR SMELTER FEED AND WAS THEREFORE UNSALABLE. A LARGE PROPORTION OF THE NI IS ASSOCIATED WITH PYRRHOTITE, EITHER IN SOLID SOLUTION OR AS FLAME EXSOLUTION OF PENTLANDITE IN PYRRHOTITE. ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-SEP-1993 | Peterson, Jocelyn A. | U.S. Geological Survey | |
| Updater | 01-OCT-1993 | Zientek, Michael L. | U.S. Geological Survey |
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.