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

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.

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

Principal Gold Districts of Montana

In Montana, 54 mining districts have each have produced more than 10,000 ounces of gold. The largest producers are Butte, Helena, Marysville, and Virginia City, each having produced more than one million ounces. Twenty seven other districts are each credited with between 100,000 and one million ounces of gold production. Read more: Principal Gold Districts of Montana.