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.
Primary Mineral: Lead, Silver
Lat, Long: 46.37222, -112.15472
Map: View on Google Maps
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
Primary: Bonanza, Dewey, and Rosalie Tunnels
Secondary: Corbin Copper Co.'s Property
District: Colorado (Corbin-Wickes) District
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.
Owner Name: Corbin Copper Co.
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Deposit Size: S
General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Mineral Deposit Model
Description: Boulder Batholith
Alteration Type: L
Alteration Text: Pyritization, Oxidation, Tourmalinization, Silicified
Age Type: Host Rock
Age Young: Late Cretaceous
Age Type: Associated Rock
Age Young: Late Cretaceous
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)
Reference (Deposit): USGS PP 428, P. 53, 75.
Reference (Deposit): MBMG BULL 16, P. 49-50
Reference (Deposit): USGS BULL 527, P. 115-14.
Colorized Mining Photos
Western Mining History's collection of colorized mining photos includes incredible scenes from Montana: Best Historical Photos: Colorized Mining Scenes.