Dewey Mine

The Dewey Mine is a gold mine located in Granite 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: Dewey Mine  

State:  Montana

County:  Granite

Elevation:

Commodity: Gold

Lat, Long: 46.82667, -113.34306

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 Dewey Mine

Dewey Mine MRDS details

Site Name

Primary: Dewey Mine


Commodity

Primary: Gold
Secondary: Silver
Secondary: Copper
Tertiary: Barium-Barite
Tertiary: Antimony


Location

State: Montana
County: Granite
District: Garnet (First Chance) District


Land Status

Not available


Holdings

Not available


Workings

Type: Underground


Ownership

Not available


Production

Year: 1916
Time Period: 1915-1916
Material type: AU CU AG
Description: Cp_Grade: ^0.9% Au, .05%Cu, .05%Ag


Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S


Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Physiographic Detail: Garnet Range


Mineral Deposit Model

Not available


Orebody

Form: IRREGULAR FLAT LENSES, BANDED


Structure

Type: R
Description: Bearmouth Overthrust

Type: L
Description: Deep Creek Anticline, Garnet Stock


Alterations

Alteration Type: L
Alteration Text: Oxidation


Rocks

Not available


Analytical Data

Analytical Data: 3.5 OZ/TON AU, 6.5 OZ/TON AG, 2%/TON CU.
Analytical Data: 1916 SHIPMENT $74/TON AU


Materials

Ore: Chalcopyrite
Ore: Gold
Ore: Tetrahedrite
Gangue: Quartz
Gangue: Pyrite
Gangue: Sericite
Gangue: Barite
Gangue: Limonite


Comments

Comment (Production): $2000000 UP TO 1948

Comment (Deposit): FAULT MOVEMENT SINCE THE FORMATION OF THE VEIN HAS MOSTLY TAKEN PLACE PARALLEL TO THE VEIN

Comment (Workings): SEVERAL LEVELS, UNDERGROUND CONNECTIONS ARE MADE WITH A SHAFT 200 FT TO THE EAST AND WITH THE NANCY HANKS MINE TO THE WEST.


References

Reference (Deposit): USGS BULL 660, P. 178-82

Reference (Deposit): MBMG MEM NO 31, P. 32

Reference (Production): MBMG MEM NO 31


Principal Gold Districts of Montana

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.