The Big Chief Prospect is a mica mine located in Madison county, Montana at an elevation of 7,700 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
Elevation: 7,700 Feet (2,347 Meters)
Commodity: Mica
Lat, Long: 45.51778, -112.11250
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.
Big Chief Prospect MRDS details
Site Name
Primary: Big Chief Prospect
Commodity
Primary: Mica
Tertiary: Beryllium
Location
State: Montana
County: Madison
District: Sheridan (Indian Creek) 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.
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Ivan Winslow
Home Office: Sheridan, Wy.
Years: 1944 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1943
Year Last Production: 1944
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Physiographic Detail: Tobacco Root Mountains
Mineral Deposit Model
Not available
Orebody
Form: PODS, PIPES
Structure
Type: L
Description: High Angle E And Ne Trending Faults
Alterations
Not available
Rocks
Name: Schist
Role: Host
Age Type: Host Rock Unit
Age Young: Neoarchean
Name: Schist
Role: Host
Age Type: Host Rock
Age Young: Neoproterozoic
Analytical Data
Not available
Materials
Gangue: Plagioclase
Gangue: Apatite
Gangue: Biotite
Gangue: Muscovite
Gangue: Quartz
Unknown: Beryl
Comments
Comment (Geology): BODY AS A WHOLE CONTAINS 2% MICA. SOME AREAS ARE ABOUT 10% MICA. SHEETS RANGE FROM AVERAGE OF 1/4 TO 3 IN DIA. UP TO 4X6 IN.
Comment (Location): 1,140 FT. ABOVE INDIAN CR. WORKINGS ARE ON STEEP POINT JUTTING OUT 100 FT FROM VALLEY WALL. ; INFO FROM LAND.ST :(1978)
Comment (Development): HIGH QUALITY STRATEGIC GRADE MICA SHIPPED DURING WWZ.
Comment (Deposit): 5 PEGMATITES, 4 TO 55 FT. LONG AND 3 TO 15 FT. WIDE.
Comment (Workings): ONE 9X5X7 FT PIT.
References
Reference (Deposit): M.B.M.G. MEM. 28, 1949, P. 22-23
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.
