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Bluebird

Occurrence in Sweet Grass county in Montana, United States with commodities Chromium, Platinum, Palladium, Rhodium
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Geologic information

Identification information

Deposit ID 10095653
MRDS ID M060093
Record type Site
Current site name Bluebird
Alternate or previous names Blue Bird
Related records 10148516

Geographic coordinates

Geographic coordinates: -109.96218, 45.38853 (WGS84)
Elevation 2499
Location accuracy 100(meters)
Relative position ABOUT 3 MI WEST OF MOUNTAIN VIEW LAKE, Acc Generalized Location On G Chromitite, Acc Generalized Location On G Chromitite
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Geographic areas

Country State County
United States Montana Sweet Grass

Public Land Survey System information

Meridian Township Range Section Fraction State
Montana Principal 005S 014E 22,23 Montana

Comments on the location information

  • UNSURVEYED. IN CUSTER NATIONAL FOREST.

Commodities

Commodity Importance
Chromium Primary
Platinum Tertiary
Palladium Tertiary
Rhodium Tertiary

Materials information

Materials Type of material
Chromite Ore
Olivine Gangue

Analytical data

Result CR2O3 IN USBM SAMPLES RAN 1.71-39.99%. ANALYSIS OF B CHROMITITE YIELDED 460 PPB PT, 120 PPB PD, 310 PPB RH. CR2O3 CONTENT: AVERAGE 18% CHROMITE

Mineral occurrence model information

Model code 2
USGS model code 2a
Deposit model name Bushveld Cr

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite
    Stratigraphic age (youngest) Neoarchean
    Stratigraphic age (youngest) Early Cretaceous

Nearby scientific data

(1) -109.96218, 45.38853
ListMap

Geologic structures

Type Description Terms
Regional 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)
Local Small Faults Offset Chromitite Zone

Ore body information

  • General form LENSES
    Strike N75E
    Dip 60SE
    Thickness 0.98M
    Depth to top 0M
    Length 457.2M

Controls for ore emplacement

  • Crystal Settling In Large Magma Chamber

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
Deposit size Small
Significant No
Discovery year 1939

Mining district

District name In Stillwater Complex

Land status

Ownership category National Forest

Comments on the workings information

  • TRENCHES AND PROSPECT PITS

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS M060093
U.S. Bureau of Mines Minerals Availability System MAS 0300970026

Bibliographic references

  • Deposit

    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. 31-33.

  • Deposit

    PAGE, N.J, RILEY, L.B., AND HAFFTY, JOSEPH, 1969, PLATINUM, PALLADIUM, AND RHODIUM ANALYSES OF ULTRAMAFIC AND MAFIC ROCKS FROM THE STILLWATER COMPLEX, MONTANA: U.S. GEOLOGICAL SURVEY CIRCULAR 624, P. 9.

  • 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

    TRENCHING AND ANALYSES BY USBM DURING WWI

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-73 Dohrenwend, John C. U.S. Geological Survey
Updater 01-AUG-91 Peterson, Jocelyn A. U.S. Geological Survey