The Frog Pond West is a platinum, palladium, and rhodium mine located in Sweet Grass county, Montana at an elevation of 8,950 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: 8,950 Feet (2,728 Meters)
Commodity: Platinum, Palladium, Rhodium
Lat, Long: 45.45444, -110.13833
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.
Frog Pond West MRDS details
Site Name
Primary: Frog Pond West
Secondary: J-M Reef
Commodity
Primary: Platinum
Primary: Palladium
Primary: Rhodium
Secondary: Gold
Secondary: Copper
Secondary: Nickel
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
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Middle Rocky Mountains
Mineral Deposit Model
Model Name: Merensky Reef PGE
Orebody
Form: STRATIFORM, DISSEMINATED
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
Name: Norite
Role: Host
Age Type: Associated Rock Unit
Age Young: Neoarchean
Name: Norite
Role: Host
Age Type: Host Rock
Age Young: Early Cretaceous
Analytical Data
Not available
Materials
Ore: Pyrite
Ore: Chalcopyrite
Ore: Pyrrhotite
Ore: Pentlandite
Gangue: Talc
Gangue: Magnetite
Gangue: Apatite
Gangue: Phlogopite
Gangue: Plagioclase
Gangue: Olivine
Gangue: Serpentine
Gangue: Tremolite
Gangue: Chlorite
Gangue: Hornblende
Gangue: Pyroxene
Comments
Comment (Commodity): NO PUBLISHED PGE DATA AVAILABLE FOR THIS AREA
Comment (Location): UNSURVEYED. IN GALLATIN NATIONAL FOREST. LOCATION OF ADIT IS SHOWN ON PICKET PIN MOUNTAIN TOPOGRAPHIC QUADRANGLE MAP
Comment (Deposit): THE J-M REEF IS 400-500 M ABOVE THE BASE OF BANDED SERIES THE IN BASAL PART OF ANORTHOSITE I SUBZONE OF TROCTOLITE-ANORTHOSITE ZONE I. THIS COINCIDES WITH THE REAPPEARANCE OF OLIVINE IN THE CRYSTALLIZATION SEQUENCE.
Comment (Workings): ADIT
Comment (Geology): THE J-M REEF IS 1-3 M THICK AND CAN BE TRACED FOR 40 KM. AGE OF STILLWATER COMPLEX IS 2,705 +/- 4 MA BASED ON U-PB SYSTEMATICS ON ZIRCON-BADDELEYITE (PREMO AND OTHERS, 1990)
Comment (Deposit): SEE ALSO: MRDS MP00087.
References
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.
Reference (Deposit): SEGERSTROM, KENNETH, AND CARLSON, R.R., 1982, GEOLOGIC MAP OF THE BANDED UPPER ZONE OF THE STILLWATER COMPLEX AND ADJACENT ROCKS, STILLWATER, SWEET GRASS, AND PARK COUNTIES, MONTANA: U.S. GEOLOGICAL SURVEY MISCELLANEOUS GEOLOGIC INVESTIGATIONS MAP I-1383, SCALE 1:24,000.
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.
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.
