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Stillwater Mine, Stillwater Complex, Nye, Stillwater Co., Montana, USA

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Latitude & Longitude (WGS84): 45° 23' 20'' North , 109° 52' 25'' West
Latitude & Longitude (decimal): 45.38895,-109.87365
Köppen climate type:Dfc : Subarctic climate

PGM ores (mainly of Pd and Pt) are mined from the eastern portion of the J-M Reef. The deposit was discovered in the early 1970s; mining commenced in 1986. During 2003, the Stillwater Mine (owned by the Stillwater Mining Co.) produced approximately 428,000 ounces of palladium and platinum, compared to approximately 492,000 ounces in 2002 and approximately 504,000 ounces in 2001.

Mineral List

62 valid minerals. 5 (TL) - type locality of valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Holocene - Pleistocene
0 - 2.588 Ma

ID: 2064965
Glacial moraine deposits

Age: Pleistocene (0 - 2.588 Ma)

Description: glacial moraine deposits

Lithology: Sand, gravel

Reference: Zientek, M.L., P.D. Derkey, R.J. Miller, J.D. Causet et al. Spatial Databases for the Geology of the Northern Rocky Mountains - Idaho, Montana, and Washington. U.S. Geological Survey Open-File Report 2005-1235 Version 1.0. [25]

2500 - 4000 Ma

ID: 2930264
Stillwater complex

Age: Archean (2500 - 4000 Ma)

Stratigraphic Name: Stillwater Complex

Description: Layered ultramafic and mafic rocks from peridotite and pyroxenite at the base (ultramafic series) to gabbro and anorthosite in the upper part (banded series). Maximum exposed thickness in the Beartooth Mountains is about 6,700 m (22,000 ft).

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Gobla, M.J. (2012) Montana mineral locality index. Rocks & Minerals: 87(3): 208-240.

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