Bonanza Group

The Bonanza Group is a gold and silver mine located in Fergus 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: Bonanza Group  

State:  Montana

County:  Fergus


Primary Mineral: Gold, Silver

Lat, Long: 47.295, -109.47900

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 Bonanza Group

Bonanza Group MRDS details

Site Name

Primary: Bonanza Group


Primary: Gold
Primary: Silver


State: Montana
County: Fergus

Land Status

Land ownership: Unknown
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.


Type: Unknown


Not available


Owner Name: Arnold Smith
Percent: 100.0
Home Office: Montana
Info Year: 1988


Not available


Record Type: Site
Operation Category: Prospect
Operation Type: Underground
Mining Method: Unknown
Years of Production:
Significant: N


General Physiographic Area: Interior Plains
Physiographic Province: Great Plains Province
Physiographic Section: Missouri Plateau, Unglaciated

Mineral Deposit Model

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Analytical Data

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Comment (Reference): The abbreviated citation in the reference field is probably: Avery, D.W., Sweeney, T.M., and Satkoski, J., 1989, Principal deposits of strategic and critical minerals in Montana: Spokane, Wash., U.S. Bureau of Mines, unpaginated. (Prepared for publication as Information Circular but never released. A copy is on file at the Montana Bureau of Mines and Geology, Butte, Mont.)

Comment (Location): Political location in record is Fergus county. However, original lat/long plots 18 km inside adjacent Judith Basin county. The reference is unpublished and will be difficult to check. Original coordinates were: lat/long NAD27 47-17-0N 110-22-0W (47.2833 -110.3667); UTM N5236626 E547895 Z12N; PLSS line# 1: Meridian- Montana Principal, TWNSHP 018 N, RNG 018 E, Sect 30, Sect_fract . PLSS coords translate to 47.295 -109.479. The latitude is close to agreement but the longitude differs by 0.888 degrees (53 minutes). There are several Bonanza Group gold deposits at a similar latitude but way west in Mineral county, probably not relevant. A gold deposit in the vicinity of the original lat/long would be anomalous. All nearby deposits are industrial minerals. In contrast, the PLSS location lies near a rich gold mining area (Kendall 10269407). So the lat/long was changed to the PLSS coordinates, agreeing with the county name.