Jumbo Prospect

The Jumbo Prospect is a lead and silver mine located in Jefferson county, Montana at an elevation of 7,100 feet.

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: Jumbo Prospect  

State:  Montana

County:  Jefferson

Elevation: 7,100 Feet (2,164 Meters)

Commodity: Lead, Silver

Lat, Long: 46.33944, -112.21056

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 Jumbo Prospect

Jumbo Prospect MRDS details

Site Name

Primary: Jumbo Prospect


Primary: Lead
Primary: Silver


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.


Not available


Not available


Owner Name: Buford Nyland, Murry E. Gow
Home Office: Basin, Mt.


Not available


Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Significant: N
Deposit Size: S


General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains

Mineral Deposit Model

Not available


Not available


Type: R
Description: Boulder Batholith


Not available


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

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

Analytical Data

Not available


Ore: Galena
Gangue: Quartz


Comment (Location): 4.5 KM NW OF COMET. ; INFO FROM LAND.ST :(1950)

Comment (Workings): AN ADIT (CAVED)


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

Reference (Deposit): MBMG BULL 16, P. 32-33.

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.