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Iron Mountain Ni-Cu Camp

Occurrence in Sweet Grass county in Montana, United States with commodities Nickel, Copper, Cobalt, Platinum, Palladium, Rhodium, PGE, Silver, Gold
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Ownership information
  18. Reserves and resources
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10048509
MRDS ID MP00099
Record type Site
Current site name Iron Mountain Ni-Cu Camp

Geographic coordinates

Geographic coordinates: -110.07552, 45.40825 (WGS84)
Elevation 2911
Relative position ABOUT 1.75 MI SOUTHWEST OF SOUTH PICKET PIN LAKE

Site location context

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)

Geographic areas

Country State County
United States Montana Sweet Grass

Comments on the location information

  • UNSURVEYED. IN GALLATIN NATIONAL FOREST

Commodities

Commodity Importance
Nickel Critical Primary
Copper Primary
Cobalt Critical Secondary
Platinum Critical Secondary
Palladium Critical Secondary
Rhodium Critical Secondary
PGE Critical Tertiary
Silver Tertiary
Gold Tertiary

Comments on the commodity information

  • NO SITE-SPECIFIC MINERALOGICAL STUDIES HAVE BEEN MADE FOR THIS PROSPECT. SEE PAGE (1979) FOR GENERAL DESCRIPTION OF BASAL SERIES MINERALIZATION. ONLY NI AND CU CONTENTS WERE DETERMINED FOR DRILL CORE BY AMAX. PGM AND CO DATA WERE NOT SYSTEMATICALLY ACQUIRED BY AMAX FOR MINERALIED DRILL CORE. SELECT SAMPLES WERE REANALYZED FOR PGM BY THE USGS; SUMMARY OF RESULTS ON PULPS ARE GIVEN IN ZIENTEK (1993)

Materials information

Materials Type of material
Chalcopyrite Ore
Pentlandite Ore
Pyrrhotite Ore
Magnetite Gangue
Plagioclase Gangue

Alteration

  • (Local) None Related To Ore-Forming Process

Analytical data

Result SEE RESERVE/RESOURCE DATA FOR CU AND NI CONTENTS. PT, PD, AND RH CONTENTS FOR SULFIDE MIERLAIZATION IN THE IRON MOUNTAIN AREA (CAMP AND IRON CREEK AREAS) ARE SUMMARIZED IN ZIENTEK (1993)
Result MAX. CONCENTRATIONS IN PULPS OF DRILL CORE ARE PT=530 PPB, PD=2.9 PPM. AND RH=100 PPB

Mineral occurrence model information

Model code 1
USGS model code 1
Deposit model name Stillwater Ni-Cu

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Hornfels
    Rock unit name Stillwater Complex, Peridotite Zone Of Ultramafic Series;;Stillwater Complex, Basal Series
    Rock description Stillwater Complex, Peridotite Zone Of Ultramafic Series;;Stillwater Complex, Basal Series

Nearby scientific data

(1) Schist
ListMap

Economic information

Geologic structures

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 Rocks In Prospect Area Are Cut By Steeply Dipping, Transverse Faults And Mafic Dikes That Are Perpendicular To Layering In The Stillwater Complex. Mineralized Stillwater Cumulates Will Likely Be Truncated At Depth By Longitudinal, South-Dipping High-Angle Reverse Faults

Ore body information

  • General form LENSES, TABULAR CONCENTRATIONS
    Length 2413.95M
    Depth to top 0M

Controls for ore emplacement

  • Immiscible Sulfide Liquid Enriched In Ni And Cu Exsolved From Mafic Silicate Magma And Accumulated Near Lower Contact Of The Stillwater Complex. Assimilation Of Sulfur From Rocks Adjacent To The Stillwater Complex May Have Led To The Exsolution Of The Sulfide Liquid (Zientek And Ripley, 1990)

Comments on the geologic information

  • AGE OF STILLWATER COMPLEX IS 2,705 +/- 4 MA BASED ON U-PB SYSTEMATICS ON ZIRCON-BADDELEYITE (PREMO AND OTHERS, 1990)

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name In Stillwater Complex

Land status

Ownership category National Forest

Ownership information

  • Type Operator
    Owner Stillwater Pgm Resources, A Manville-Chevron Joint Venture
    First year 1993

Comments on the production information

  • NO PRODUCTION

Reserves and resources

  • Type In-situ
    Estimate year 1993
    Total resources 2000mt ore
    Commodity Subtype Grade units Group Importance Year
    Nickel Ni 0.42 wt-pct Nickel Major 1993
    Copper Cu 0.23 wt-pct Copper Major 1993

Comments on the reserve resource information

  • DRILL INDICATED RESERVES ARE BASED ON INTERCEPTS IN 9 DRILL HOLES. ADDITIONAL INFORMATION ABOUT CALCULATION METHOD GIVEN IN ZIENTEK (1993)

Comments on the workings information

  • NO WORKINGS

Comments on development

  • AREA IS PART OF AMAX'S LI CLAIM GROUP, WHICH WAS STAKED IN 1968-1969. AMAX (1968-1979?); MANVILLE AND LATER STILLWATER PGM RESOURCES LEASED CLAIMS FROM AMAX AND HELD THEM UNTIL 1993. AMAX'S EXPLORATION OF THE STILLWATER AREA BEGAN IN THE SUMMER OF 1967 WITH AN ORIENTATION GEOCHEMICAL RECONNAISSANCE SURVEY FOLLOWED IN THE FALL BY A LOW-ALTITUDE HELICOPTER MAGNETICS SURVEY. IN JUNE 1968, AN INTENSIVE HELICOPTER-SUPPORTED GEOCHEMICAL STREAM-SEDIEMNT SAMPLING PROGRAM WAS CONDUCTED IN THAT PART OF THE EAST BOULDER PLATEAU NOT ALREADY CLAIMED BY ANACONDA OR FREEPORT, WHICH WAS SOON FOLLOWED BY CLAIM STAKING (J.F. MCKNIGHT, WRITTEN COMMUN., 1969). AMAX CONDUCTED AN EXTENSIVE EXPLORATION PROGRAM INCLUDING MAPPING, GROUND-BASED GEOPHYSICAL SURVEYS (IP AND MAGNETICS), GEOCHEMICAL SAMPLING, TRENCHING, AND DRILLING. DRILL TARGETS INCLUDED BOTH GEOPHYSICAL ANOMALIES (PRINCIPALLY IP) AND GEOCHEMICAL ANOMALIES; C AREAS WITH CU >200 PPM IN SOILS ARE ILLUSTRATED IN ZINETEK (1993) 18,688 FT OF
  • CORE WAS OBTAINED FROM 45 HOLES, DRILLED DURING 1969-1975

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit DEPOSIT CONSISTS OF LENTICULAR TO TABULAR SHAPED DISSEMINATED, MATRIX, AND MASSIVE CONCENTRATIONS OF MAGMATIC SULFIDE MINERALS NEAR THE MARGIN OF MAFIC AND ULTRAMAFIC INTRUSIONS OF THE STILLWATER COMPLEX. MINERALIZATION OCCURS FOR AT LEAST 1.5 MI ON STRIKE NEAR THE BASE OF THE COMPLEX; RESOURCE CALCULATIONS ARE BASED ON A SEGMENT APPROXIMATELY 2400 FT LONG. THIS RECORD ENCOMPASES MINERALIZED PERIDOTITE ZONE AND BASAL SERIES THAT ARE SOUTHWEST AND SOUTH OF IRON MOUNTAIN (PAGE AND NOKLEBERG, 1974); SEE DRILL PATTERN ILLUSTRATED IN ZIENTEK (1993)

Reporter information

Type Date Name Affiliation Comment
Reporter 01-OCT-1991 Peterson, Jocelyn A. U.S. Geological Survey
Updater 01-OCT-1993 Zientek, Michael L. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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