Boulder Mine

The Boulder Mine is a silver, gold, and zinc 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: Boulder Mine  

State:  Montana

County:  Jefferson

Elevation:

Primary Mineral: Silver, Gold, Zinc

Lat, Long: 46.27889, -112.28833

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 Boulder Mine

Boulder Mine MRDS details

Site Name

Primary: Boulder Mine


Commodity

Primary: Silver
Primary: Gold
Primary: Zinc
Secondary: Lead
Secondary: Copper


Location

State: Montana
County: Jefferson
District: Basin (Cataract, Comet) 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: Unknown


Ownership

Owner Name: James Bragg

Owner Name: James P. Bragg


Production

Not available


Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1881
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: L
Description: Fault Zone Trends N75w, Dips 70-85 S


Alterations

Alteration Type: L
Alteration Text: Oxidized (Oxidation Of Sulfide Minerals)


Rocks

Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock
Age Young: Late Cretaceous


Analytical Data

Not available


Materials

Ore: Gold
Ore: Galena
Ore: Chalcopyrite
Ore: Sphalerite
Ore: Malachite
Gangue: Pyrite
Gangue: Limonite
Gangue: Quartz


Comments

Comment (Deposit): 3 OR MORE FISSURE VEINS. VEIN HAS BEEN INTRUDED AND SPLIT ALONG ITS STRIKE BY A QUARTZ LATITE DIKE ABOUT 500 FT LONG AND 50 FT THICK.

Comment (Commodity): ORE DESCRIBED AS HEMATITE CONTAINING AURIFEROUS PYRITE AND "FREE GOLD"

Comment (Location): ON SE SLOPE OF POLE MT. ; INFO FROM LAND.ST :(1954)

Comment (Production): PRODUCING 1961.

Comment (Development): FORMERLY OWNED BY THE BASIN GOLD FIELDS, LTD.

Comment (Workings): TWO ADITS, DRIFTS AND CROSSCUTS: MOST WORKING ACCESSIBLE IN 1960 WORKINGS EPLORE THE DEPOSIT THROUGH A HORZONTAL RANGE OF 1300 FT AND A VERTICLE RANGE OF 160 FT. SOME TRENCHES.


References

Reference (Deposit): MBMG BULL 16, P. 22, 24, 100.

Reference (Deposit): USGS BULL 1151, P. 100, PL. 1.

Reference (Deposit): MBMG BULL 33, P. 13

Reference (Production): MBMG BULL 16, USGS BULL 1151.


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.