The Forge Ni-Cu is a nickel and copper mine located in Sweet Grass county, Montana at an elevation of 8,960 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: 8,960 Feet (2,731 Meters)
Commodity: Nickel, Copper
Lat, Long: 45.42333, -110.10417
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.
Forge Ni-Cu MRDS details
Site Name
Primary: Forge Ni-Cu
Secondary: Placer Basin
Secondary: Boulder Forge
Commodity
Primary: Nickel
Primary: Copper
Secondary: Rhodium
Secondary: Palladium
Secondary: Platinum
Secondary: Cobalt
Tertiary: Gold
Tertiary: Silver
Tertiary: PGE
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: Amax, Inc.
Years: 1968 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Year: 1932
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: Stillwater Ni-Cu
Orebody
Form: STRATIFORM, PODS, LENSES, 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
Alteration Type: L
Alteration Text: None Related To Ore-Forming Process
Rocks
Name: Peridotite
Role: Host
Age Type: Host Rock
Age Young: Early Cretaceous
Name: Peridotite
Role: Host
Age Type: Associated Rock Unit
Age Young: Neoarchean
Analytical Data
Analytical Data: AVERAGE PGE IN SURFACE SAMPLES: 19.5 PPB PT, 73.0 PPB PD, <5 PPB RH (MAX.: 62 PPB PT, 210 PPB PD, 9 PPB RH)
Materials
Ore: Pyrrhotite
Ore: Pentlandite
Ore: Chalcopyrite
Gangue: Magnetite
Gangue: Plagioclase
Comments
Comment (Deposit): Discovery Year: BEFORE EARLY 1930'S
Comment (Commodity): SEE PAGE (1979) FOR GENERAL DESCRIPTION OF BASAL SERIES MINERALIZATION.
Comment (Location): UNSURVEYED. IN GALLATIN NATIONAL FOREST. LOCATION GIVEN IS JUST NORTH OF FORGE CREEK ON WEST SIDE OF PLACER BASIN
Comment (Deposit): DEPOSIT IS PROBABLY SIMILAR TO MOUAT. LOW GRADE
Comment (Workings): DIAMOND DRILLING 1967: 4 HOLES TOTALING 1,861 FT; 1969, 6 HOLES TOTALLING 2,700 FT
Comment (Geology): AGE OF STILLWATER COMPLEX IS 2,705 +/- 4 MA BASED ON U-PB SYSTEMATICS ON ZIRCON-BADDELEYITE (PREMO AND OTHERS, 1990)
References
Reference (Deposit): PAGE, N.J, ROWE, J.J., AND HAFFTY, JOSEPH, 1976, PLATINUM METALS IN THE STILLWATER COMPLEX, MONTANA: ECONOMIC GEOLOGY, V. 71, P. 1352-1363.
Reference (Deposit): PAGE, N.J, AND NOKLEBERG, W.J., 1974, GEOLOGIC MAP OF THE STILLWATER COMPLEX, MONTANA: U.S. GEOLOGICAL SURVEY MISCELLANEOUS GEOLOGIC INVESTIGATIONS MAP I-797, SCALE 1:12,000.
Reference (Deposit): PAGE, N.J, 1979, STILLWATER COMPLEX, MONTANA - STRUCTURE, MINERALOGY, AND PETROLOGY OF THE BASAL ZONE WITH EMPHASIS ON THE OCCURRENCE OF SULFIDES: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1038, 69 P.
Reference (Deposit): ZIENTEK, M.L., AND RIPLEY, E.M., 1990, SULFUR ISOTOPIC STUDIES OF THE STILLWATER COMPLEX AND ASSOCIATED ROCKS, MONTANA: ECONOMIC GEOLOGY, V. 85, P. 376-391.
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): 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.
