Bonanza, Dewey, and Rosalie Tunnels

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

Name: Bonanza, Dewey, and Rosalie Tunnels  

State:  Montana

County:  Jefferson

Elevation:

Primary Mineral: Lead, Silver

Lat, Long: 46.37222, -112.15472

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.


Satelite image of the Bonanza, Dewey, and Rosalie Tunnels

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.


Colorized Mining Photos

Drumlummon Mine at Marysville, Montana late 1880s

Western Mining History's collection of colorized mining photos includes incredible scenes from Montana: Best Historical Photos: Colorized Mining Scenes.