The Jumbo Group is a iron mine located in Beaverhead county, Montana at an elevation of 6,801 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: 6,801 Feet (2,073 Meters)
Commodity: Iron
Lat, Long: 45.39167, -112.84167
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.
Jumbo Group MRDS details
Site Name
Primary: Jumbo Group
Secondary: Birch Cr Fe
Commodity
Primary: Iron
Tertiary: Tungsten
Location
State: Montana
County: Beaverhead
District: Birch Creek (Utopia) District
Land Status
Land ownership: Private
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
Type: Underground
Ownership
Owner Name: Arley R. Jacobs, Et. Al.
Home Office: Missoula, Mt.
Years: 1960 -
Production
Year: 1904
Time Period: 1875-1904
Description: Cp_Grade: ^40-70% Fe
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Contact Metasomatic
Operation Type: Unknown
Year First Production: 1908
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Physiographic Detail: Pioneer Mountains
Mineral Deposit Model
Not available
Orebody
Form: SHOOTS OR LENSES
Structure
Type: L
Description: East Limb Of Humbolt Mtn Anticline, Pioneer Batholith
Alterations
Not available
Rocks
Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Cambrian
Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Cretaceous
Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock
Age Young: Late Cambrian
Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous
Analytical Data
Analytical Data: TACTITE FROM NW OF SHEEP CR ASSAYED 0.013-0.042% WO3A K2 CRET
Materials
Ore: Scheelite
Ore: Powellite
Ore: Magnetite
Gangue: Epidote
Gangue: Hematite
Gangue: Calcite
Comments
Comment (Location): NE 1/4, SECTION 21
Comment (Production): PRODUCTION HAS BEEN LITTLE SINCE 1904.
Comment (Development): MAGNETITE ZONES WERE MINED AROUND 1900 FOR USE AS FLUX AT THE GLENDALE SMELTER AND IN BUTTE. ; ECON.COM: ROAD NOT ADEQUATE FOR ORE HAULAGE
Comment (Deposit): TACTITE EXTENDS 1600 FEET AND AVERAGES 113 FEET WIDE. FOUR MAGNETITE LENSES OCCUR, THE LARGEST OF WHICH IS 14X11X15 FEET. (PATTEE, 1960)
Comment (Workings): SEVERAL ADITS FROM 25-70 FEET LONG
Comment (Geology): GEOL.DESC: FLOAT, EXPOSURES OVER 1600 X 113 FT. AREA. ON W. SIDE OF TONGUE OF MT. TORREY BATHOLITH.
Comment (Deposit): JUMBO GROUP CONSISTS OF JUMBO, INDIAN SQUAW, INDIAN CHIEF, U.S. TREASURER, AND BURCH.
References
Reference (Deposit): USBM RI 5552, P. 78.
Reference (Deposit): MBMG BULL 85, P. 93.
Reference (Deposit): MBMG IC 13, P. 30-31.
Reference (Deposit): 1960 RECON U.S. BUREAU OF MINES, R.I. 5552
Reference (Deposit): 1972 COMPILE M.B.M.G. BULL. 85
Reference (Production): M.B.M.G. BULL. 85, P. 93, M.B.M.G. I.C. 13, P. 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.
