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
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.
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.
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.
