The Janet 50 is a zinc, nickel, platinum, palladium, lead, gold, arsenic, and copper mine located in Sweet Grass county, Montana at an elevation of 9,199 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: 9,199 Feet (2,804 Meters)
Commodity: Zinc, Nickel, Platinum, Palladium, Lead, Gold, Arsenic, Copper
Lat, Long: 45.4175, -110.04861
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.
Janet 50 MRDS details
Site Name
Primary: Janet 50
Commodity
Primary: Zinc
Primary: Nickel
Primary: Platinum
Primary: Palladium
Primary: Lead
Primary: Gold
Primary: Arsenic
Primary: Copper
Location
State: Montana
County: Sweet Grass
District: In Stillwater Complex
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: Johns-Manville Products Corp.
Years: 1977 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Deposit Type: Unknown
Operation Type: Unknown
Discovery Year: 1967
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Middle Rocky Mountains
Mineral Deposit Model
Not available
Orebody
Form: UNKNOWN
Structure
Type: R
Description: The Stillwater Complex Is Exposed Along The Northern Margin Of The Beartooth Uplift, One Of Several Laramide Basement-Cored Ranges That Make Up The Rocky Mountain Foreland Of South-Central Montana (Foose And Others, 1961: Kulik And Schmidt, 1988)
Alterations
Not available
Rocks
Not available
Analytical Data
Analytical Data: AVERAGE GRADE 0.24% NI+CU, 2.7 PPM PT+PD, PT:PD=1-2. 692 PPB PT, 1.278 PPM PD AVG., SURFACE SAMPLES
Materials
Ore: Pentlandite
Ore: Gold
Ore: Magnetite
Ore: Sphalerite
Ore: Chalcopyrite
Ore: Graphite
Ore: Pyrite
Ore: Sperrylite
Ore: Galena
Ore: Pyrrhotite
Comments
Comment (Location): UNSURVEYED. IN CUSTER NATIONAL FOREST
Comment (Deposit): GRAPHITE IN AREA GENERATED A LARGE IP ANOMALY. DIMENSIONS GIVEN ARE SURFACE EXPOSURE OF MINERALIZED AREA; UNPUBLISHED MODEL NAME: DISCORDANT PGE MINERALIZATION.
Comment (Geology): AGE OF STILLWATER COMPLEX IS 2,705 +/- 4 MA BASED ON U-PB SYSTEMATICS ON ZIRCON-BADDELEYITE (PREMO AND OTHERS, 1990)
Comment (Commodity): MUCH OF PGM ARE AS INCLUSIONS IN PYRRHOTITE. PD ALSO FOUND IN SOLID SOLUTION WITH PENTLANDITE
References
Reference (Deposit): PREMO, W.R., HELZ, R.T., ZIENTEK, M.L., AND LANGSTON, R.B., 1990, U-PB AND SM-ND AGES FOR THE STILLWATER COMPLEX AND ITS ASSOCIATED SILLS AND DIKES, BEARTOOTH MOUNTAINS, MONTANA: IDENTIFICATION OF A PARENT MAGMA?: GEOLOGY, V. 18, P. 1065-1068.
Reference (Deposit): CONN, H.K., 1979, THE JOHNS-MANVILLE PLATINUM-PALADIUM PROSPECT, STILLWATER COMPLEX, MONTANA, U.S.A.: CANADIAN MINERALOGIST, V. 17, P. 463-468.
Reference (Analytical Data): CONN, 1979
Reference (Deposit): ZIENTEK, M.L., 1993, MINERAL RESOURCE APPRAISAL FOR LOCATABLE MINERALS: THE STILLWATER COMPLEX, IN HAMMARSTROM, J.M., ZIENTEK, M.L., AND ELLIOTT, J.E., EDS., MINERAL RESOURCE ASSESSMENT OF THE ABSAROKA-BEARTOOTH STUDY AREA, CUSTER AND GALLATIN NATIONAL FORESTS, MONTANA: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 93-207, P. F1-F83.
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.
