Gray Eagle Mine

Past Producer in Jefferson county in Montana, United States with commodities Silver, Lead, Copper, Zinc, Gold, Uranium, Molybdenum, Antimony, Arsenic

Geologic information

Identification information

Deposit ID 10071368
MRDS ID W014710
Record type Site
Current site name Gray Eagle Mine
Related records 10148978

Geographic coordinates

Geographic coordinates: -112.19977, 46.31323 (WGS84)
Elevation 2012
Relative position ABOUT 10 KM NORTHEAST OF BASIN, MONTANA
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Geographic areas

Country State County
United States Montana Jefferson

Public Land Survey System information

Meridian Township Range Section Fraction State
Montana Principal 007N 005W 35 Montana

Comments on the location information

  • ON BISHOP CR ABOUT 1.75 MI W OF THE COMET MINE.

Commodities

Commodity Importance
Silver Primary
Lead Primary
Copper Primary
Zinc Primary
Gold Secondary
Uranium Tertiary
Molybdenum Tertiary
Antimony Tertiary
Arsenic Tertiary

Comments on the commodity information

  • ZN A LIABILITY INSTEAD OF AN ASSET

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Molybdenite Ore
Sphalerite Ore
Tetrahedrite Ore
Ankerite Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Sericitization And Intense Alteration Of Quartz Monzonite

Analytical data

Result SAMPLES OF WEATHERED RADIOACTIVE VEIN MATERIAL ASSAYED 2.2% URANIUM AND 40% EQUIVALENT URANIUM

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite
    Rock unit name Boulder Batholith, Butte Quartz Monzonite;Elkhorn Mountains Volcanics
    Rock description Boulder Batholith, Butte Quartz Monzonite;Elkhorn Mountains Volcanics
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff > Welded Tuff
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff > Welded Tuff

Nearby scientific data

(1) -112.19977, 46.31323

Geologic structures

Type Description Terms
Regional Boulder Batholith, South-Trending Syncline In Elkhorn Mountains Volcanics
Local Comet - Gray Eagle Shear Zone, Roof Pendant Of Elkhorn Mountains Volcanics

Ore body information

  • General form SHOOTS
    Strike N 75 W
    Dip VERTICAL
    Width 12.19M

Controls for ore emplacement

  • Comet-Gray Eagle Shear Zone

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1891
Discovery method Ore-Mineral In Place
Year of first production 1902

Mining district

District name Basin (Cataract, Comet) District

Ownership information

  • Type Operator
    Owner Mills, H.
    Home office Boulder, Mt.
  • Type Owner
    Owner R. H. Mills,
    Home office Spokane Washington

Comments on the production information

  • PRODUCTION ABOVE DOES NOT INCLUDE 1913, 1914, 1921. AFTER 1930 PRODUCTION INCLUDED WITH COMET MINE.

Workings at the site

  • Type of workings Underground
    Length 3048M

Comments on the workings information

  • IN 1905 THE MINE HAD 3 ADITS AGGREGATING 3400 FT. IN 1927 THE OLD TUNNEL WAS REPAIRED AND 1500 FT OF DEVELOPMENT WAS DONE. IN 1929 THE MINE WAS OPENED BY A 400 FT ADIT AND A VERTICAL WINZE FROM THE ADIT LEVEL TO THE 600 FT LEVEL. 3000 FT OF DEVELOPMENT WAS COMPLETED. 1930 5000 FT OF DRIFTS, CROSSCUTS, AND RAISES WERE RUN. THE MINE HAS 4 ADITS RANGING IN LENGTH FROM 480 TO 3000 FT. 2 ADDITIONAL LEVELS ARE OPENED BELOW THE LOWER MAIN ADIT BY A 250 FT SHAFT. ALL ADIT PORTALS ARE CAVED (1950).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS W014710

Bibliographic references

  • Deposit

    MBMG BULL-16, P. 29-30

  • Deposit

    USGS BULL 527, P. 121

  • Deposit

    USGS BULL 842, P. 287-89.

  • Deposit

    USGS PP 428, P. 40, 42, 53, 54, 84, 86.

  • Deposit

    MBMG BULL 7.

  • Deposit

    MBMG BULL 10, P. 25

  • Production

    MBMG BULL 16, P. 30

General comments

Subject category Comment text
Deposit MOST ORE CAME FROM TWO ORE BODIES ON NORTH VEIN, ONE WAS 10-15 FT. WIDE, 70-120 FT. LONG AND HAD A VERTICAL EXTENT OF ABOUT 250 FT. THE OTHER ORE BODY WAS STOPED FROM THE 400 FT. LEVEL TO THE SURFACE VEIN SYSTEM IS COMPOSED OF 2 MAIN VEINS ABOUT 30 M APART AND MANY SMALLER VEINS WITHIN A WIDE ALTERED ZONE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1976 Mlynarczyk, Meg S. U.S. Geological Survey
Updater 01-JUL-1981 Wise, Kristine K. (Elliott, James E.) U.S. Geological Survey