Sylvan Mine

The Sylvan Mine is a uranium 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: Sylvan Mine  

State:  Montana

County:  Jefferson

Elevation:

Primary Mineral: Uranium

Lat, Long: 46.30556, -112.25833

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 Sylvan Mine

Sylvan Mine MRDS details

Site Name

Primary: Sylvan Mine


Commodity

Primary: Uranium


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

Not available


Ownership

Not available


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: Silicified, Sericitized, Kaolinized


Rocks

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

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

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


Analytical Data

Analytical Data: 2.0% EU, .02% U, RADIOACTIVITY MOSTLY FROM RADIUM AT 9X10-9 GRAMS/GRAMS OF SAMPLE
Analytical Data: RADIOACTIVITY OF SAMPLE ASSAYED


Materials

Gangue: Pyrite
Gangue: Quartz


Comments

Comment (Location): W SIDE OF DEER CREEK. ; INFO FROM LAND.ST :(1954)

Comment (Deposit): THE RADIOACTIVE MATERIAL CONSISTS OF BLACK EARTHY MATERIAL ASSOCIATED WITH ABUNDANT UNALTERED EUHEDRAL PYRITE CRYSTALS.

Comment (Workings): 3 CAVED ADITS


References

Reference (Deposit): USGS BULL 1151, P. 117, PL. 1


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.