The Helena District is a gold and silver 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.
Helena District MRDS details
Site Name
Primary: Helena District
Commodity
Primary: Gold
Primary: Silver
Secondary: Copper
Secondary: Lead
Secondary: Zinc
Secondary: Stone
Tertiary: Tungsten
Tertiary: Arsenic
Tertiary: Marble, Dimension
Tertiary: Dolomite
Location
State: Montana
County: Lewis and Clark
District: Helena District
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1864
Years of Production:
Organization:
Significant: N
Deposit Size: L
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
Alterations
Not available
Rocks
Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock
Age Young: Late Cretaceous
Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock Unit
Age Young: Mississippian
Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous
Analytical Data
Not available
Materials
Ore: Gold
Ore: Chalcopyrite
Ore: Limestone
Ore: Galena
Gangue: Quartz
Gangue: Pyrite
Gangue: Calcite
Comments
Comment (Production): QUARTZ MONZONITE HAS BEEN QUARRIED FROM THE HARRISONAAND SCHIMPF QUARRIES.
Comment (Deposit): THE ORE DEPOSITS ARE MAINLEY NEAR THE CONTACT OF THE BATHOLITH WITH THE SEDIMENTARY ROCKS. SOME ARE IN THE GRANITIC ROCKS AND OTHERS ARE IN THE ADJACENT HORNFELS OR TACTITE.
Comment (Geology): SEDIMENTARY ROCKS GO FROM CRETACEOUS-QUADRANT QUARTZITE THROUGH PRECAMBRIAN-BELT SERIES. TERT-RHVDLITE TUFF IS PRESENT.
Comment (Location): LAT/LONG GENERAL FOR AREA.
Comment (Development): LAST CHANCE GULCH WAS AMONG THE RICHEST IN PLACER GOLD, THE WHITLATCH-UNION WAS THE MOST PRODUCTIVE LODE IN THE DISTRICT. MOST OF THE RICH PLACER AND LODES WERE MINED OUT BEFORE 1900. DURING 1935-1950 THERE WERE SOME SUCCESSFUL DREDGING OPERATIONS. OTHERE MINES: SPRING HILL, INDEPENDENT, HOLMES GULCA PLACER, YELLOW JACKET, BIG INDIAN, NELSON GULCH PLACER; HARRISON, COLORADO GULCH DOLOMITE, NELSON GULCH MARBLE, SCHIMPF ARE NOMETALLIC MINES.
References
Reference (Deposit): MBMG BULL 16, P. 7.
Reference (Deposit): USGS BULL 842, P. 202-09.
Reference (Deposit): USBM R1 6334, P. 25-6.
Reference (Deposit): USGS BULL 527, P. 85-7.
Reference (Deposit): USGS PP 610, P. 155.
Reference (Deposit): MBMG MEM 26, P. 43.
Reference (Deposit): USGS-USBM YEARBOOKS
Reference (Deposit): MBMG BULL 94.
Reference (Production): USGS PP 610, P. 155; USGS-USBM YEARBOOKS. MBMG BULL 94.
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.
