Montana · Stillwater County
Producer

Stillwater Mine

Stillwater County, Montana, United States
PlatinumPalladiumPGEGoldRhodiumCopperRutheniumOsmiumIridiumNickel
⌖ Show on mapUSGS source ↗
Commodities
PrimaryPlatinum, Palladium, PGE
SecondaryGold, Rhodium
TertiaryCopper, Ruthenium, Osmium, Iridium, Nickel
Commodity typeM
Deposit
Deposit typePGE Reef
Model4: Merensky Reef PGE
Orebody formTabular, stratiform, disseminated
Materials
Ore mineralsGold, Palladium, Platinum, Chalcopyrite, Pentlandite, Pyrrhotite, Mackinawite, Pyrite
GangueOlivine, Plagioclase, Sphalerite, Galena, Apatite, Chlorite, Hornblende, Magnetite, Serpentine, Talc, Tremolite
Other materialsSilver, Marcasite, Cubanite
Geology
Host rockGabbro,Troctolite,Norite,Anorthosite · J-M Reef
Economic & production
Development statusProducer
First production1986
Discovery year1971
Identification
Deposit ID10270333
MRDS IDISM0330
Alternate namesStillwater Mining Co. Minn.Adit Prj, J-M Reef Deposit, Minneapolis Adit Project, Johns-Manville Stillwater Platinum, Stillwater Platinum Project, Stillwater Pgm Resources, M Prospect
RegionNA
Data scoreA
Coordinates45.38772, -109.87999
References
BENNETTS, J., MORRICE, E., AND WONG, M.M., 1981, PREPARATION OF PLATINUM-PALLADIUM FLOTATION CONCENTRATE FROM STILLWATER COMPLEX ORE, U.S.B.M. RI 8500.CHADWICK, J.R., 1980, IMPALA PLATINUM PREPARING TO PASS 1,000,000 OUNCES YEARLY, MINING WORLD, VOL 33, NO. 12, 5P.MILLER, R.W., 1981, PROJECT COORDINATOR, STILLWATER PROJECT, ANACONDA COPPER COMPANY, PERSONAL COMMUNICATIONPAGE, N.J. AND JACKSON,E.D., 1967, PRELIMINARY REPORT ON SULFIDE AND PLATINUM GROUP MINERALS IN THE CHROMITES OF THE STILLWATER COMPLEX, U.S.G.S. PROFRESSIONAL PAPER 575-D, PP D-123 - D-126.READ, R.F., 1977, MINERAL DEVELOPMENT POTENTIAL OF THE STILLWATER COMPLEX, MONTANA, U.S.B.M. UNPUBLISHED MAS REPORT, 16P.SEGERSTROM, K., AND CARLSON, R.R., U.S.G.S. OPEN FILE REPORTS 77-370, 78-704, 79-656, 80-364.U.S. BUREAU OF MINES, 1981, MINERAL COMMODITY SUMMARIES, PP 114-115.SEG NEWSLETTER. NORTHERN ROCKIES: MONTANA. OCT. 1991, NO. 7. P. 17.SEG NEWSLETTER. JAN. 1992, NO. 8, P. 23.GREAT FALLS TRIBUNE. MINE EXPANSION DESCRIBED AS BOTH BOON, THREAT. JAN. 1, 1992.STILLWATER COUNTY NEWS. SMC MINE EXPANSION NEARING SCHEDULE. JUNE 10, 1992.PASCHALL, TARI. CITIZENS VOICE CONCERN ABOUT SMC EXPANSION. STILLWATER COUNTY NEWS. JUNE 24, 1992.KILPATRICK, JAMES. MINE IN MONTANA BRINGS UP QUESTION OF ROYALTIES. LIVINGSTON ENTERPRISE. JUNE 29, 1992.THE MINING RECORD, VOL., 107, #49, DEC., 4, 1996, P18.THE MINING RECORD, VOL. 108, #9, FEB. 26, 1997, PP. 18,19.MINING JOURNAL, LONDON, AUG. 8, 1997, VOL. 329, #8441, P128.MANN, E.L., 1981, EXPLORATION MANAGER-MINING GROUP, JOHNS-MANVILLE CORPORATION: PERSONAL COMMUNICATION.SJOBERG, J., 1981, GEOLOGIST, U.S.B.M. RENO RESEARCH CENTER: PERSONAL COMMUNICATION.STILLWATER PGM RESOURCES, 1980, INITIAL PLAN OF OPERATIONS FOR POSSIBLE FUTURE MINING ACTIVITY BY STILLWATER PGM RESOURCES IN SWEET GRASS COUNTY, STILLWATER COMPLEX, MONTANA, 18P, 2 ILLUSTRATIONS.\nZIENTEK, 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.Czamanske, G.K., and Zientek, M.L., technical editors, 1985, The Stillwater Complex, Montana: Geology and guide: Montana Bureau of Mines and Geology Special Publication 92, 396 p.TODD, S.G., KEITH, D.W., LE ROY, L.W., SCHISSEL, D.J., MANN, E.L., AND IRVINE, T.N., 1982, THE J-M PLATINUM-PALLADIUM REEF OF THE STILLWATER COMPLEX, MONTANA: I. STRATIGRAPHY AND PETROLOGY: ECONOMIC GEOLOGY, V. 77, P. 1454-1480.BOW, C., WOLFGRAM, D., TURNER, A., BARNES, S., EVANS, J., ZDEPSKI, M., AND BOUDREAU, A., 1982, INVESTIGATIONS OF THE HOWLAND REEF OF THE STILLWATER COMPLEX, MINNEAPOLIS ADIT AREA: STRATIGRAPHY, STRUCTURE, AND MINERALIZATION: ECONOMIC GEOLOGY, V. 77, P. 1481-1492.COOMBES, J.S., 1990, PLATINUM 1990: JOHNSON MATTHEY, P. 18.MONT. BUREAU OF MINES AND GEOL. BULLETIN 129, 1991, 1:500,000 SCALE.STILLWATER MINING COMPANY 1995 ANNUAL REPORT, PP. 13, 30.THE MINING RECORD, VOL. 108, #9, FEB. 26, 1997, PP. 18, 19.STILLWATER MINING COMPANY 1994 ANNUAL REPORT, P10.