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Chrome Lake Ni-Cu

Occurrence in Stillwater county in Montana, United States with commodities Nickel, Copper, Cobalt, PGE, Silver, Gold
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Geologic information

Identification information

Deposit ID 10056249
MRDS ID SP01082
Record type Site
Current site name Chrome Lake Ni-Cu

Geographic coordinates

Geographic coordinates: -109.79746, 45.35159 (WGS84)
Elevation 2560
Relative position LESS THAN 0.1 MI NORTH OF CHROME LAKE
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Geographic areas

Country State County
United States Montana Stillwater

Comments on the location information

  • IN CUSTER NATIONAL FOREST. UNSURVEYED

Commodities

Commodity Importance
Nickel Primary
Copper Primary
Cobalt Secondary
PGE Tertiary
Silver Tertiary
Gold Tertiary

Comments on the commodity information

  • SEE PAGE (1979) FOR GENERAL DESCRIPTION OF BASAL SERIES MINERALIZATION.

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 52 PPB PT, 41 PPB PD, 2.7 PPB RH MAX. IN SURFACE SAMPLES

Mineral occurrence model information

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

Nearby scientific data

(1) -109.79746, 45.35159
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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)

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

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No

Mining district

District name In Stillwater Complex

Land status

Ownership category National Forest

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS SP01082

Bibliographic references

  • Deposit

    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.

  • Deposit

    PREMO, W.R., HELZ, R.T., ZIENTEK, M.L., AND LANGSTON, R.B., 1990, U-PB AND SM-ND AGES FOR THE STILLWATER COMPLEX AND ITS ASSOCIATED SILLS AND DIKES, BEARTOOTH MOUNTAINS, MONTANA: IDENTIFICATION OF A PARENT MAGMA?: GEOLOGY, V. 18, P. 1065-1068.

  • Deposit

    ZIENTEK, M.L., AND RIPLEY, E.M., 1990, SULFUR ISOTOPIC STUDIES OF THE STILLWATER COMPLEX AND ASSOCIATED ROCKS, MONTANA: ECONOMIC GEOLOGY, V. 85, P. 376-391.

  • Deposit

    PAGE, N.J, 1979, STILLWATER COMPLEX, MONTANA - STRUCTURE, MINERALOGY, AND PETROLOGY OF THE BASAL ZONE WITH EMPHASIS ON THE OCCURRENCE OF SULFIDES: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1038, 69 P.

  • Deposit

    ZIENTEK, M.L., AND COOPER, R.W., UNPUB. ANALYTICAL DATA

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1993 Peterson, Jocelyn A. U.S. Geological Survey