Horsefly Mine

The Horsefly Mine is a mine located in Lewis and Clark 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: Horsefly Mine  

State:  Montana

County:  Lewis and Clark

Elevation:

Primary Mineral:

Lat, Long: 46.45889, -112.20972

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 Horsefly Mine

Horsefly Mine MRDS details

Site Name

Primary: Horsefly Mine
Secondary: Horsefly Adit


Commodity

Tertiary: Uranium


Location

State: Montana
County: Lewis and Clark
District: Rimini 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

Form: BANDS, PODS


Structure

Type: R
Description: Boulder Batholith


Alterations

Alteration Type: L
Alteration Text: Intensely Altered Quartz Monzonite


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

Not available


Materials

Gangue: Quartz
Gangue: Pyrite


Comments

Comment (Deposit): WATER FROM ADIT MORE RADIOACTIVE THAN DUMP

Comment (Location): 150 FT BELOW RYOLITE ON RED MOUNTAIN. ; INFO FROM LAND.ST :(1950)

Comment (Workings): CAVED ADIT


References

Reference (Deposit): USGS MAP MR-21, P. 12.

Reference (Deposit): USGS PP 428, P. 55, 61, PL. 1.