Janet 50

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

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.

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.