The Leonard Mine is a copper mine located in Silver Bow county, Montana at an elevation of 5,000 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
Elevation: 5,000 Feet (1,524 Meters)
Commodity: Copper
Lat, Long: 46.02083, -112.50417
Map: View on Google Maps
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.
Leonard Mine MRDS details
Site Name
Primary: Leonard Mine
Commodity
Primary: Copper
Secondary: Silver
Tertiary: Tungsten
Location
State: Montana
County: Silver Bow
District: Butte District
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Owner Name: The Anaconda Co., Butte, Montana 59701
Owner Name: The Anaconda Co., Butte, Montana
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1887
Discovery Year: 1886
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
Not available
Structure
Type: R
Description: Boulder Batholith
Type: L
Description: Rarus Fault
Alterations
Alteration Type: L
Alteration Text: Main Stage Alteration
Rocks
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
Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock
Age Young: Late Cretaceous
Analytical Data
Not available
Materials
Ore: Covellite
Ore: Huebnerite
Ore: Enargite
Ore: Chalcocite
Ore: Tetrahedrite
Gangue: Quartz
Gangue: Pyrite
Gangue: Barite
Comments
Comment (Production): PRODUCTION FOR ENTIRE BUTTE DISTRICT
Comment (Development): MINING HAS BEEN EXCLUSIVELY ON SELECTIVE VEINS OF BOTH AGES W OF THE MIDDLE FAULT, ON HORSETAIL BODIES AND SELECTIVE VEINS BETWEEN THE MIDDLE FAULT AND NO. 20 FAULT. VERY LITTLE EXPLORATION AND DEVELOPMENT WORK HAS BEEN CARRIED OUT E OF THE NO. 20 FAULT.
Comment (Deposit): COPPER MINERALIZATION OCCURS IN HORSETAIL ORE BODIES AND NW-TRENDING MAIN STAGE VEINS. THE ORE BODY IN PLACES CONSISTED OF A MASS OF CRUSHED GRANITE. THE GROUND BETWEEN THE VEINS WERE NETTED AND THAT LESSER STREAKS ARE ABUNDANT AND IN MANY PLACES THE GRANITE WAS COBWEBBED WITH ORE.
Comment (Workings): MINES IN THE BUTTE DISTRICT, WHILE INDIVIDUALLY MAY BE SMALL PRODUCERS ARE LARGE WHEN CONSIDERED AS A WHOLE DEPOSIT.
Comment (Geology): LARGEST MASSES OF QUARTZ PORPHYRY IN DISTRICT FOUND NEAR THE LEONARD & EAST COLUSA SHAFTS - THESE BODIES IN OR NEAR HORSETAIL ORE ZONE OF THE CENTRAL DISTRICT.
Comment (Commodity): ORE PRINCIPALLY FROM HORSETAIL ORE BODIES OF THE EASTERN PORTION OF MAIN DISTRICT & NW TRENDING MAIN STAGE VEINS
References
Reference (Deposit): MILLER, R. N., ED., 1973, GUIDEBOOK FOR THE BUTTE FIELD MEETING, PRESENTED BY THE SOCIETY OF ECONOMIC GEOLOGISTS
Reference (Deposit): USGS PP 74, P. 210-15, PL. X.
Reference (Deposit): MBMG BULL 109, P. 19.
Reference (Production): MILLER, 1973, GUIDEBOOK FOR BUTTE FIELD MEETING
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.
