Armstrong Mine

The Armstrong Mine is a silver and lead mine located in Lewis and Clark county, Montana.

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: Armstrong Mine  

State:  Montana

County:  Lewis and Clark

Elevation:

Primary Mineral: Silver, Lead

Lat, Long: 46.48083, -112.28361

Map: View on Google Maps

Satelite View


Satelite image of the Armstrong Mine

Armstrong Mine MRDS details

Site Name

Primary: Armstrong Mine


Commodity

Primary: Silver
Primary: Lead
Secondary: Gold
Secondary: Zinc
Secondary: Copper
Tertiary: Uranium


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 indicate a claim status and does not necessarily indicate an area is open to prospecting.


Holdings

Not available


Workings

Type: Underground


Ownership

Not available


Production

Year: 1940
Material type: ORE
Description: Ap_Grade: ^9.52% Pb, 7.6% Zn, .243 Au, 11.5 Oz/Ton Ag


Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
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

Not available


Structure

Type: R
Description: Boulder Batholith

Type: L
Description: Fault Zone Trending East, Dip 80n


Alterations

Not available


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

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


Analytical Data

Analytical Data: WEAK RADIOACTIVITY .007-.015 MR/HOUR ON ALL DUMPS. 9.52% PB, 7.6% ZN, 0.243 AU, 11.5 OZ/TON AG


Materials

Ore: Sphalerite
Ore: Gold
Ore: Galena
Ore: Chalcopyrite
Gangue: Pyrite
Gangue: Quartz
Gangue: Tourmaline


Comments

Comment (Production): ZINC IS A LIABILITY SINCE PENALIZED AT THE MILL, SHOULD BE MILLED WITH FLOATATION.

Comment (Workings): FOUR ADITS ALL CONNECTED BY STOPES ALONG THE VEIN, VERTICAL STOPE RANGE 300 FT.

Comment (Location): 1.7 KM NW OF LEE MTN, W SIDE OF MINNEHANA GULCH. ; INFO FROM LAND.ST :(1950)


References

Reference (Deposit): USGS BULL 1151, P. 98, PL. 1.

Reference (Deposit): US B. OF MINES, 1943, REPT. TO SEC. OF INT.

Reference (Deposit): USGS BULL 842, P. 248.

Reference (Production): USGS BULL 1151, P. 97; USBM REPT. TO SEC. INT.