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
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.
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
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.
