Lee Mountain

The Lee Mountain is a silver and gold mine located in Lewis and Clark county, Montana at an elevation of 5,801 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: Lee Mountain

Commodity

Primary: Silver
Primary: Gold
Secondary: Zinc
Secondary: Lead
Tertiary: Arsenic
Tertiary: Antimony

Location

State: Montana
County: Lewis and Clark
District: Rimini District

Land Status

Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Type: Underground

Ownership

Owner Name: Cooper, A. T., Mgr.
Home Office: Box 362 Helena, Mt 59601

Production

Year: 1938
Time Period: 1934-1938
Material type: AU
Description: Cp_Grade: ^ 15-30 Oz/Ton Ag
Year: 1924
Material type: ORE
Description: Ap_Grade: ^0.12 Oz/Ton Au, 14 Oz/Ton Ag, 8 % Pb, 4 % Zn
Year: 1904
Time Period: 1902-1904
Material type: ORE
Description: Cp_Grade: ^0.25-0.5 Oz/Ton Au
Year: 1891
Material type: ORE
Description: Ap_Grade: ^0.5 Oz/Ton Au, 11.6 Oz/Ton Ag, 6% Pb

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1864
Discovery Year: 1864
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: IRREGULAR

Structure

Type: R
Description: Boulder Batholith

Type: L
Description: Postmineral North - South Faults Dipping 80 Deg W Displacement Horizontal Offset 20 Feet Each, To Westlee Mountain-Valley Forge Shear Zone

Alterations

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

Rocks

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

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

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

Analytical Data

Analytical Data: FROM LOWEST TUNNEL: $2-4/TON AU; 20 OZ/TON AG, 10 % PB;

Materials

Ore: Galena
Ore: Sphalerite
Ore: Tetrahedrite
Ore: Gold
Gangue: Pyrite
Gangue: Tourmaline

Comments

Comment (Location): ALTITUDE APPROXIMATE, LOCATION FROM U. S. GEOLOGICAL SURVEY PROF. PAPER 428 , PLATE 1 ; INFO FROM LAND.ST :(1950)

Comment (Production): REYNER AND TRAVERMAN REFERENCE INDICATES PRODUCTION OF 33,323 DOLLARS OF ORE IN 1948. ABOUT $1.5 MILLION PRODUCED PRIOR TO 1913

Comment (Workings): 7 MAIN LEVELS CAVED, FLOODED SHAFT ON LEVEL 7,

Comment (Geology): U. S. GEOLOGICAL SURVEY PROF. PAPER 428 HAS WITHIN IT A PLATE NO. 1 WHICH CATEGORIZES OR DIFFERENTIATES WITHIN THE BOULDER BATHOLITH AND MAPS THIS AREA AS, A MEDIUM GRAINED DARK GRAY BIOTITE-HORNBLENDE GRANODIORITE.

Comment (Deposit): STRIKE AND DIP FIGURES PERTAIN TO SHEAR ZONE WITHIN WHICH THE ORE DEPOSITS OCCUR. ON LEVEL 7 THE VEIN IS MADE UP OF MANY PARALLEL STRINGERS, VEINS, AND LENSES WHICH ARE AS MUCH AS 10 FT WIDE IN A ZONE 60 FT WIDE. MOST VEINS AND LENSES STRIKE NE, THE VEIN IS CUT BY MANY NE, E AND NW-TRENDING FAULTS.

References

Reference (Deposit): USGS PP 428, P. 55

Reference (Production): USGS PP 428, P. 55.

Reference (Deposit): USGS BULL 842, P. 83-84

Reference (Deposit): MBMG MEM 31, P. 56

Reference (Deposit): USGS BULL 842, P. 255-57.

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.