Gray Eagle Mine

The Gray Eagle Mine is a silver, lead, copper, and zinc mine located in Jefferson county, Montana at an elevation of 6,601 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Name: Gray Eagle Mine  

State:  Montana

County:  Jefferson

Elevation: 6,601 Feet (2,012 Meters)

Primary Mineral: Silver, Lead, Copper, Zinc

Lat, Long: 46.31333, -112.19889

Map: View on Google Maps

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.


Satelite image of the Gray Eagle Mine

Gray Eagle Mine MRDS details

Site Name

Primary: Gray Eagle Mine


Commodity

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


Location

State: Montana
County: Jefferson
District: Basin (Cataract, Comet) District


Land Status

Not available


Holdings

Not available


Workings

Type: Underground


Ownership

Owner Name: R. H. Mills,
Home Office: Spokane Washington

Owner Name: Mills, H.
Home Office: Boulder, Mt.


Production

Not available


Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1902
Discovery Year: 1891
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S


Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains


Mineral Deposit Model

Not available


Orebody

Form: SHOOTS


Structure

Type: R
Description: Boulder Batholith, South-Trending Syncline In Elkhorn Mountains Volcanics

Type: L
Description: Comet - Gray Eagle Shear Zone, Roof Pendant Of Elkhorn Mountains Volcanics


Alterations

Alteration Type: L
Alteration Text: Sericitization And Intense Alteration Of Quartz Monzonite


Rocks

Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous

Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock
Age Young: Late Cretaceous


Analytical Data

Analytical Data: SAMPLES OF WEATHERED RADIOACTIVE VEIN MATERIAL ASSAYED 2.2% URANIUM AND 40% EQUIVALENT URANIUM


Materials

Ore: Tetrahedrite
Ore: Chalcopyrite
Ore: Molybdenite
Ore: Galena
Ore: Sphalerite
Ore: Gold
Gangue: Quartz
Gangue: Pyrite
Gangue: Ankerite


Comments

Comment (Location): ON BISHOP CR ABOUT 1.75 MI W OF THE COMET MINE.

Comment (Commodity): ZN A LIABILITY INSTEAD OF AN ASSET

Comment (Production): PRODUCTION ABOVE DOES NOT INCLUDE 1913, 1914, 1921. AFTER 1930 PRODUCTION INCLUDED WITH COMET MINE.

Comment (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.

Comment (Workings): 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).


References

Reference (Deposit): MBMG BULL-16, P. 29-30

Reference (Deposit): USGS BULL 527, P. 121

Reference (Deposit): USGS BULL 842, P. 287-89.

Reference (Deposit): USGS PP 428, P. 40, 42, 53, 54, 84, 86.

Reference (Deposit): MBMG BULL 7.

Reference (Deposit): MBMG BULL 10, P. 25

Reference (Production): MBMG BULL 16, P. 30


Colorized Mining Photos

Drumlummon Mine at Marysville, Montana late 1880s

Western Mining History's collection of colorized mining photos includes incredible scenes from Montana: Best Historical Photos: Colorized Mining Scenes.