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Scientific Investigations Report 2014–5183

A Geologic and Mineral Exploration Spatial Database for the Stillwater Complex, Montana

By Michael L. Zientek and Heather L. Parks

Thumbnail of and link to report PDF (4 MB)Abstract

The Stillwater Complex is a Neoarchean, ultramafic to mafic layered intrusion exposed in the Beartooth Mountains in south-central Montana. This igneous intrusion contains magmatic mineralization that is variably enriched in strategic and critical commodities such as chromium, nickel, and the platinum-group elements. One deposit, the J-M Reef, is the sole source of primary production and reserves for platinum-group elements in the United States.

A large amount of information has been collected on the Stillwater Complex. In the 1930s, academics, the U.S. Geological Survey, and the [U.S.] Bureau of Mines initiated geologic investigations on the Stillwater Complex. Since that time, more than 600 publications on the Stillwater Complex have appeared in the scientific literature. Exploration and mining companies have collected even more information since the 1920s.

This report provides essential spatially referenced datasets based on geologic mapping and mineral exploration activities conducted from the 1920s to the 1990s. This information will facilitate research on the complex and provide background material needed to explore for mineral resources and to develop sound land-management policy.

First posted October 28, 2014

This report is only available online.

For additional information, contact:
GMEG staff, Geology, Minerals, Energy, & Geophysics
U.S. Geological Survey
904 W. Riverside Ave., Room 202
Spokane, WA 99201

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Suggested citation:

Zientek, M.L., and Parks, H.L., 2014, A geologic and mineral exploration spatial database for the Stillwater Complex, Montana: U.S. Geological Survey Scientific Investigations Report 2014-5183, 28 p.,

ISSN 2328-0328 (online)




Overview of Data Files

Stillwater Complex—Rock Types and Geologic Map Units

Description of Feature Classes in Stillwater_Complex.gdb—Geologic Maps

Exploration-Related Spatial Datasets

Description of Feature Classes in Stillwater_Complex.gdb—Exploration Datasets

References Cited


Figures (8)

Tables (18)

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