The Bonanza, Dewey, and Rosalie Tunnels is a lead and silver mine located in Jefferson 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.
Bonanza, Dewey, and Rosalie Tunnels MRDS details
Site Name
Primary: Bonanza, Dewey, and Rosalie Tunnels
Secondary: Corbin Copper Co.'s Property
Commodity
Primary: Lead
Primary: Silver
Secondary: Copper
Secondary: Zinc
Location
State: Montana
County: Jefferson
District: Colorado (Corbin-Wickes) 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: Corbin Copper Co.
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
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
Alterations
Alteration Type: L
Alteration Text: Pyritization, Oxidation, Tourmalinization, Silicified
Rocks
Name: Tuff
Role: Associated
Age Type: Host Rock
Age Young: Late Cretaceous
Name: Tuff
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous
Analytical Data
Not available
Materials
Ore: Sphalerite
Ore: Chalcopyrite
Ore: Galena
Gangue: Quartz
Gangue: Tourmaline
Gangue: Pyrite
Comments
Comment (Workings): CONCENTRATOR BUILT IN 1910, NEAR BONANZA TUNNEL.. 4000 FT OF LEVEL WORKING EXTEND 1900 FT W OF PORTAL OF THE BONANZA TUNNEL. ROSALIE CONSISTS OF A CROSSCUT THAT EXTENDS FOR 900 FT AND A DRIFT FROM THE CROSSCUT TO THE W FOR 800 FT
Comment (Deposit): ZONE OF SHEARED, ALTERED ROCK 60-100 FT. WIDE . PYRITE, QUARTZ, PRIMARY CARBONATES, AND MANGANESE OXIDES ARE ON THE DEWEY AND BONANZA DUMPS. AT ROSALIE TUNNEL THE ORE IS SIMALAR AND OF GOOD GRADE BUT A SMALL AMOUNT. PYRITIZED DACITE "CONGLOMERATE" IN MONTANA TUNNEL CONTAINS A LITTLE GALENA, 3-4% PYRITE, AV. 8 OZ AG FOR 130 FT IN UPPER TUNNEL.
Comment (Location): BONANZA TUNNEL USED FOR LOCATION. DEWEY IS 0.3 KM W OF BONANZA, ROSALIES IS 0.5 KM E OF BONANZA. ; INFO FROM LAND.ST :(1950)
References
Reference (Deposit): USGS PP 428, P. 53, 75.
Reference (Deposit): MBMG BULL 16, P. 49-50
Reference (Deposit): USGS BULL 527, P. 115-14.
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.
