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
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.
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 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
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.
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.
