The Triangle and Grass Widow Mines is a copper mine located in Missoula 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.
Triangle and Grass Widow Mines MRDS details
Site Name
Primary: Triangle and Grass Widow Mines
Secondary: Morning Mine
Commodity
Primary: Copper
Secondary: Silver
Secondary: Gold
Location
State: Montana
County: Missoula
District: Clinton District
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
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
Not available
Structure
Type: R
Description: Bearmouth Overthrust
Type: L
Description: Clinton Stock
Alterations
Alteration Type: L
Alteration Text: Sericitization, Oxidation
Rocks
Name: Diorite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Cretaceous
Name: Diorite
Role: Associated
Age Type: Host Rock
Age Young: Late Cretaceous
Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous
Analytical Data
Analytical Data: 3.5-6.75% CU, 7-13OZ/TON AG, $1.50-2.50/TON AU
Materials
Ore: Chalcopyrite
Ore: Ankerite
Ore: Gold
Ore: Specularite
Gangue: Calcite
Gangue: Quartz
Comments
Comment (Deposit): 540 FT ADIT. ; INFO.SRC : 1 PUB LIT
Comment (Location): ADITS ON NE SIDE OF WOODVILLE CR.
Comment (Production): $3500 IN ORE SHIPMENTS
Comment (Deposit): A COMPOSITE VEIN OR ZONE OF PARALLEL FRACTURES. MOST OF THE FRACTURES CONTAIN ORE SEAMS THAT ARE GENERALLY LESS THAN AN INCH IN WIDTH. THE INTERVENING GRANODIORITE IS MODERATELY CRUSHED AND EXTENSIVELY BLEACHED AND SERICITIZED.
Comment (Workings): TRANGLE CLAIM IS AN ADIT-DRIFT 540FT LONG TO A DEPTH OF 400 FT; GRASS WIDOW IS 2 SHORT ADITS (50 & 75FT); THE PRINCIPAL WORKINGS IS A CROSSCUT 513FT LONG FROM THE TRIANGLE WORKINGS.
Comment (Geology): GEOL.DESC: OXIDES, SULFIDES OF FE AND CU
References
Reference (Deposit): USGS BULL 660 P. 228-9.
Reference (Deposit): MBMG BULL 8, P. 36-37.
Reference (Production): USGS BULL 660
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.
