| Lat / long: | 45.40825, -110.07552 |
| Primary: | Nickel, Copper |
| Secondary: | Rhodium, Cobalt, Platinum, Palladium |
| Tertiary: | PGE, Silver, Gold |
| Ore: | Chalcopyrite, Pentlandite, Pyrrhotite |
| Gangue: | Magnetite, Plagioclase |
| Orebody form: | LENSES, TABULAR CONCENTRATIONS |
| Operation type: | Unknown |
| Production size: | None |
| Development status: | Occurrence |
| Host rock: | Stillwater Complex, Peridotite Zone Of Ultramafic Series;;Stillwater Complex, Basal Series |
| Host type: | Hornfels |
| Structure: | 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), Rocks In Prospect Area Are Cut By Steeply Dipping, Transverse Faults And Mafic Dikes That Are Perpendicular To Layering In The Stillwater Complex. Mineralized Stillwater Cumulates Will Likely Be Truncated At Depth By Longitudinal, South-Dipping High-Angle Reverse Faults |
| Tectonic: | Tectonic Setting At Time Of Emplacement Of The Stillwater Complex Is Unknown. The Complex Was Emplaced Shortly After A Major Regional, Subduction-Related Magmatic Event That Culminated In Emplacement Of The 2.73-2.79 Ga Granitoid Suite In The Batholith Exposed In The Beartooth Uplift (Wooden And Others, 1991). However, There Is No Evidence That The Magmatism That Formed The Stillwater Complex Is Related To Convergent Margin Tectonics And Magmatism |
| Alteration processes: | None Related To Ore-Forming Process |
| MRDS | MP00099 |
| DEP | 10048509 |
| 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.}{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.}{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.}{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.}{Deposit:: WOODEN, J.L., CZAMANSKE, G.K., AND ZIENTEK, M.L., 1991, A LEAD ISOTOPIC STUDY OF THE STILLWATER COMPLEX, MONTANA: CONSTRAINTS ON CRUSTAL CONTAMINATION AND SOURCE REGIONS: CONTRIBUTIONS TO MINERALOGY AND PETROLOGY, V. 107, P. 80-93.}{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.}{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.} |
| Reporter | Peterson, Jocelyn A., Zientek, Michael L. |