 | | Journal (article/letter/editorial) | | COMPOSITION OF PLATINUM-GROUP MINERALS IN THE J-M REEF, STILLWATER COMPLEX BÉLINDA GODEL,† Centre for Exploration...platinum-group element (PGE)–bearing J-M reef, Stillwater Complex (Montana). The aims of the study were to determine...(skaergaardite) with minor native Pd, [Ru(Ir, Os)S2] (laurite), and Au-Pd-Ag alloy (palladian electrum). These...Bushveld Complex (South Africa) and the Stillwater Complex (Montana) contain stratiform layers, or “reefs...elements (PGE). In both the Bushveld and the Stillwater Complexes, the PGE are found spatially associated |  | Barnes, Sarah-Jane, Pagé, P., Prichard, H. M., Zientek, M. L., Fisher, P. C. (2016) Chalcophile and platinum-group element distribution in the Ultramafic series of the Stillwater Complex, MT, USA—implications for processes enriching chromite layers in Os, Ir, Ru, and Rh. Mineralium Deposita, 51 (1) 25-47 doi:10.1007/s00126-015-0587-y | Journal (article/letter/editorial) | | distribution in the Ultramafic series of the Stillwater Complex, MT, USA—implications for processes enriching...of the rocks from the Ultramafic series of the Stillwater Complex are enriched in PGE relative to most...how the enrichment occurred in the case of the Stillwater Complex and applied our results to the chromite...are laurite and fine-grained intergrowths of pentlandite, millerite, and chalcopyrite. The laurite occurs...Geological Survey, Spokane Office, Spokane, WA, USA whole rock and magnetite rims around the sulfides |  | Prichard, Hazel M., Barnes, Sarah-Jane, Fisher, Peter C., Pagé, Philippi, Zientek, Michael L. (2017) Laurite and Associated PGM In the Stillwater Chromitites: Implications For Processes of Formation, and Comparisons With Laurite In the Bushveld and Ophiolitic Chromitites. The Canadian Mineralogist, 55 (1) 121-144 doi:10.3749/canmin.1600006 | Journal (article/letter/editorial) | | DOI: 10.3749/canmin.1600006 LAURITE AND ASSOCIATED PGM IN THE STILLWATER CHROMITITES: IMPLICATIONS FOR...FOR PROCESSES OF FORMATION, AND COMPARISONS WITH LAURITE IN THE BUSHVELD AND OPHIOLITIC CHROMITITES HAZEL...The most common PGM observed is laurite [Ru(Os,Ir)S2], but how the laurite formed is not clearly understood...nine chromite layers (A to K) in the Stillwater Complex, Montana and then extend the study to examine...ophiolites. The most common PGM in the Stillwater chromitites is laurite, predominantly enclosed in chromite |  | | Journal (article/letter/editorial) | | euhedral. The PGM inclusions are (Ru, Os, Ir) $2, laurite, and (Os, Ir, Ru alloy), rutheniridosmine: Laurites...neither platinum nor palladium has been detected. Laurite inclusions in chromite from the ultramafic zone...tectonic settings and origins (e.g., Stillwater Complex, Montana, USA; Page and Jackson 1967; Page 1971;...Stockton State College, Pomona, New Jersey, 08240, USA 1981; Newfoundland ophiolitic rocks, Canada, Watkinson...less than 20 microns, and averages 10 microns. Laurite grains are largest, whereas alloys are slightly |  | | Journal (article/letter/editorial) | | Platinum-GroupMinerals in Chromite Seamsof the Stillwater Complex, Montana RAYMOND W. TALKINGTON GeologyDepartment-NAMS...massivechromite,in the ultramaficzone of the Stillwater Complex.They are small,generallylessthan 20 •t...extensive than Ru ,• Ir. Both Pd and Rh abundances in laurite are lessthan 2 wt percent. No Pt wasdetected.At...occasional occurrences of cumulus THE Stillwater Complex, Montana, is an Archcan (•2,700 m.y.)layeredi...Page(1971), andPage et al. (1972) have identified laurite inclusionsin chromite and olivine from the B seam |  | | Journal (article/letter/editorial) | | almost invariably in the Merensky Reef and in Stillwater, whereas Ru sulfide is abundant in ophiolites...Merensky Reef, Driekop (Tarkian and Stumpfl 1975), Stillwater (Volborth et al. 1986) and the Witwatersrand...V:SE Borneo ($tumpfl 8, Torkian 1973) lII : Driekop Mine, Bushveld (Torkian¢$tumpf11975 I l,]I; $orashigawo...t - - P d sulfides from the Merensky Reef and Stillwater (Fig. 6) reveals that members of the braggite...are lacking in the Merensky Reef, whereas in Stillwater the complete solid solution series including |  | | Journal (article/letter/editorial) | | fractionation processes. Texture and composition of laurite and Os–Ir–Ru alloys included in chromite cores...located in the intergranular chlorite matrix (laurite, Ir–Ru–Rh sulfarsenides and Pt–Pd compounds with...correlation of major chromitite layers across four mine sections at the investigated localities (modified...With the exception of samples from the Pedrinhas mine which contain serpentine as the major interstitial...serpentinization of intercumulus olivine (Pedrinhas mine). B Moderately altered chromite grains in strongly |  | Marcantonio, Franco, Zindler, Alan, Reisberg, Laurie, Mathez, E.A. (1993) Re-Os isotopic systematics in chromitites from the Stillwater Complex, Montana, USA. Geochimica et Cosmochimica Acta, 57 (16) 4029-4037 doi:10.1016/0016-7037(93)90351-v | Journal (article/letter/editorial) | | syste~~ti~s in ~hro~tites from the Stillwater Complex, Monks + .OO USA FRANCO MARCANTONIO,’ ALAN ZINDLER...Observatory ofColumb~a University, Palisades, NY 10964, USA 2Department of Mineral Sciences, American Museum...Museum of Natural History, New York, NY 10024, USA (Received March 24, 1993; accepted in revised form May 27...Abstract-New Re-0s isotopic data on chromitites of the Stillwater Complex demonstrate isotopic equilibrium between...observed in chromitites and other rocks from the Stillwater Complex could result from interaction with these |  | | Journal (article/letter/editorial) | | 94025. Aasrnect of laurite are defined from a study of five Jaska, and from the Stillwater Complex, Mon_ ric...probably having [001] parting. ror Goodnews Bay laurite, (Ru1.s1lr6.e1)S1.es, 5, 40.3, and 37.2/6, rcspectively;...il:T'"lT:fliJij.rt*::Jtr[:iTfi;r],: h.trnoouctrou Laurite is the natural cubic ruthenium sulfide, Rus2. rt...in ultramafic complexes and in placer deposits. Laurite is a sou.ce of ruthenium metal, which becauseof...group to produce long-wearing electrical contacts. Laurite was originally described from platinum_bearing |  | Pagé, Philippe, Barnes, Sarah-Jane, Bédard, Jean H., Zientek, Michael L. (2012) In situ determination of Os, Ir, and Ru in chromites formed from komatiite, tholeiite and boninite magmas: Implications for chromite control of Os, Ir and Ru during partial melting and crystal fractionation. Chemical Geology, 302. 3-15 doi:10.1016/j.chemgeo.2011.06.006 | Journal (article/letter/editorial) | | Canada G1K 9A9 U.S. Geological Survey, Spokane, WA, USA a r t i c l e i n f o Article history: Accepted...representatives of cumulate chromites, chromites from the Stillwater Complex and as representative of chromites formed...on the presence of IPGE minerals (IPGM) such as laurite (RuS2) — erlichmanite (OsS2) and some alloys as...Primitive Mantle Crustal Stratiform Chromitites 102 Stillwater n = 25 101 100 Mantle Podiform Chromitites...for the crustal stratiform chromitites from the Stillwater Complex. Normalising values from McDonough and |  | | Journal (article/letter/editorial) | | Re-Os isotopic investigation of the Stillwater Complex, Montana C.E. M a r t i n Department of Geology...J-M Reef and the G-chromitite horizons of the Stillwater Complex were analyzed for their Re and Os concentrations...in-situ Re decay since the time at which the Stillwater Complex formed. The lowest initial 187Os/lS6Os...platinum group element-bearing phases, predominantly laurite (Ru, Os, Ir)S2). Oxygen isotopic analyses of the...become saturated in chromite also precipitated laurite, which carried the mantle Os isotopic signature |  | | Report (issue) | | Pd0.28 )Σ=0.88 (Te1.56 Bi0.44 )Σ=2.00 . (2) Impala mine, Transvaal, South Africa; by electron microprobe...(Pt0.88 (Te1.72 Bi0.28 )Σ=2.00 . (3) Stillwater complex, Montana, USA; by electron microprobe, corresponding... kotulskite, froodite, sperrylite, cooperite, laurite, braggite, insizwaite, gold, pyrrhotite, pentlandite...Tundra, Kola Peninsula [TL]; and at the Oktyabr mine, Noril’sk region, western Siberia. In South Africa...Transvaal. In the USA, at the Stillwater complex, Montana; from the New Rambler Cu–Ni mine, Medicine Bow |  | | Report (issue) | | 99201 2U.S. Geological Survey, Tucson, AZ 85705, USA 1990 5/14/91 TABLE OF CONTENTS Executive Summary...electron images of Pt-Fe alloy with inclusions of laurite from S. Pedohon, Tabang area, East Kalimantan....Back-scattered and secondary electron images of laurite, S. Pirik area, South Kalimantan. 5/14/91 Figure...estimated to have been produced (Quiring, 1962). Laurite (RuS2) was first identified in materials from Kalimantan...occurring 12 km to the southeast, at the Pagaran Si Ajoe mine. Despite regional and detailed mapping and sampling |  | | Journal (article/letter/editorial) | | sulphide phases. In addition to these associations, laurite (RuS 2 ) and PGE alloys occur in the same specimen...Bushveld Complex, South Africa samples and the laurite-silicate association described by Stockman (ms...Composition Size (/~m) Crystal Habit Reference a) laurite b) silicates c) fluid inclusions d) sulphide (1)...Reference Greece 1) Vourinos Complex (Xerolivados Mine) this study dunite harzburgite a) native silver...(Guillermina Mine) troctolite Cyprus 1) Kokkinorotsos Chrome Mine dunite in harzburgite a) laurite b) erlichmanite |  | | Journal (article/letter/editorial) | | (iridium-group PGM), especially laurite [25], and some of stratiform chromitites contain laurite-bearing chromite [24...equilibrium with ered intrusions, the Bushveld and Stillwater complexes [13,50–52]. mineral assemblage arc...chromititeproducing layered intrusions, the Bushveld and Stillwater complexes [13,50–52]. The mineral assemblage...host chromite grains (Figure 2). They have been Stillwater complex interpreted as the melts trapped by chromite...variable in bulk chemistry; the Oman Na2O and Stillwater SiO2 contents vary from 1 to 6 wt% and 41 to |  | Christopher Jenkins, M., Mungall, James E., Zientek, Michael L., Holick, Paul, Butak, Kevin (2020) The Nature and Composition of the J-M Reef, Stillwater Complex, Montana, USA. Economic Geology, 115 (8). 1799-1826 doi:10.5382/econgeo.4777 | Journal (article/letter/editorial) | | Nature and Composition of the J-M Reef, Stillwater Complex, Montana, USA M. Christopher Jenkins,1,2,† James...Washington 99201, USA 3Stillwater Mine, Sibanye-Stillwater, 2562 Nye Rd., Nye, Montana 59061, USA Abstract...Abstract In this contribution, we analyze 30 years of mine development data and quantitatively identify the processes...mineralization in the J-M reef horizon of the Stillwater Complex along the strike and down the dip of...area of the Stillwater mine. We compare these results with data from the East Boulder mine and whole-rock |  | | Journal (article/letter/editorial) | | rocks commonly contain small (1-10 m) grains of laurite [Ru,±Os,±Ir]S2 and/or Ru-Os-Ir-rich alloys, both...plutonic chromites leads us to suggest that the laurite inclusions commonly observed in plutonic chromite...deposits from layered intrusions including Bushveld, Stillwater, Great Dyke, and Black Thor complexes; ii) podiform-type...tholeiite, the continental flood picrite, Black Thor, Stillwater and Bushveld complexes chromitites, and chromites...those from the chromitites from the Bushveld and Stillwater complexes have IPGE+Rh < 23 ppb whereas IPGE+Rh |  | Aird, Hannah M., Ferguson, Katherine M., Lehrer, Malia L., Boudreau, Alan E. (2017) A study of the trace sulfide mineral assemblages in the Stillwater Complex, Montana, USA. Mineralium Deposita, 52 (3) 361-382 doi:10.1007/s00126-016-0664-x | Journal (article/letter/editorial) | | sulfide mineral assemblages in the Stillwater Complex, Montana, USA Hannah M. Aird 1,2 & Katherine M....2016 Abstract The sulfide assemblages of the Stillwater Complex away from the well-studied ore zones...Ocean Sciences, Duke University, Durham, NC 27708, USA 2 Department of Geological and Environmental Sciences...California State University Chico, Chico, CA 95929, USA Ni in the Peridotite Zone is largely controlled...as the J-M reef. Keywords Magmatic sulfides . Stillwater Complex . Accessory mineral assemblages . Hydromagmatic |  | | Journal (article/letter/editorial) | | minerals (PGM's) in ophiolite complexes. Two types of laurite are present. An Os-rich (up to 22% Os) variety...few cases laurite is surrounded by a ruthenian pentlandite containing up to 12% Ru. Laurite and Os-Ir-Ru...Legendre 1982). Auge (1985) records the presence of laurite, Os-Ir-Ru alloys and more rarely irarsite from...mainland. An Os-Ir-Ru alloy and an Os-Ir-rich laurite were described in chromite-rich samples from podiform...grain. Ruthenium- and osmium-rich minerals Laurite Laurite is the only PGM containing Ru as a major PGE |  | | Report (issue) | | of Ultramafic and Mafic Rocks from the Stillwater Complex Montana Platinum, Palladium, and Rhodium Analyses...Ultramafic and Mafic Rocks from the Stillwater Complex Montana By Norman J Page, Leonard B. Riley, and...and rhodium ratios for each specimen from the Stillwater Complex, ~ont-------------------------------...1. Subdivisions and terminology used for the Stillwater Complex, ~ont--------------------2. Platinum...palladium, and rhodium analyses of rocks from the Stillwater Complex, ~ont ------------------------------ |  | | Journal (article/letter/editorial) | | reef deposits: examples from the Bushveld and Stillwater Complexes Eduardo T. Mansur, Sarah-Jane Barnes...reef deposits: examples from the Bushveld and Stillwater Complexes, Geochimica et Cosmochimica Acta (2020)...reef deposits: examples from the Bushveld and Stillwater Complexes Authors: *Eduardo T. Mansur¹, Sarah-Jane...pyrrhotite and chalcopyrite from the Bushveld and Stillwater Complexes are reported. The samples are from:...Reef (Bushveld), the J-M Reef (Stillwater), Picket Pin deposit (Stillwater), and also barren sulfide-bearing |  | | Report (issue) | | Pd0.01 Ni0.03 )Σ=1.02 S0.98 . (2) Stillwater complex, Montana, USA; by electron microprobe, corresponding...vysotskite, sperrylite, moncheite, platarsite, laurite, malanite, hollingsworthite, platinum, Pt–Fe alloys...Freetown complex, Sierra Leone. From the Stillwater complex, Montana; at the junction of the Trinity and Klamath...at Snelling and Cressy, Merced Co., California, USA. In Canada, in the Lac des Iles complex, Ontario...district, British Columbia. In Russia, in the Severnyi mine, Noril’sk region, western Siberia; at the Konder |  | | Journal (article/letter/editorial) | | Oceanographic Institution, Woods Hole, MA 02543, USA Received January 28, 1991 / Accepted April 24, 1991...minor O s - I r - Ru alloys, and erlichmanite/laurite and tulameenite (Bowles 1981). The PGM in Fig...image of cuprorhodsite and laurite inclusions in P t - F e nugget, SL-UP3. Laurite exhibits Os-rim (brighter)...(brighter). La, laurite; Cu, cuprorhodsite; Pt-Fe, matrix part of P t - F e alloy. Scale bar represents 50...Backscattered-electron image of laurite inclusion in P t - F e nugget, SL-UP3. Euhedral laurite inclusion shows compositional |  | | Report (issue) | | areas in the United States The Stillwater Complex* southwestern Montana ....... 8 The Duluth Complex...the potentially economic occurrences in the Stillwater Complex, Mont.; Duluth Gabbro Complex, Minn.;...in the Karoo beds, the Messina copper mine, Palabora copper mine which recovered about 2,765 troy ounces...complexes. the Stillwater, The Stillwater Complete, Southwestern Montana The Stillwater Complex, a large...ultramafic rocks of Precambrian age, is located in Stillwater, Sweetgrass, and Park Counties, south of Columbia |  | Barkov, A. Y., Fleet, M. E., Martin, R. F., Halkoaho, T. A.A. (2005) New data on "Bonanza"-type PGE mineralization in the Kirakkajuppura PGE deposit, Penikat layered complex, Finland. The Canadian Mineralogist, 43 (5) 1663-1686 doi:10.2113/gscanmin.43.5.1663 | Journal (article/letter/editorial) | | unusual micro-aggregates), laflammeite [Pd3Pb2S2], laurite–erlichmanite series [(Ru,Os,Ir)(S,As)2 – (Os,Ru...inhabituels), laflammeïte [Pd3Pb2S2], membres de la série laurite–erlichmanite [(Ru,Os,Ir)(S,As)2 – (Os,Ru,Ir)(S...MINERALIZATION IN THE KIRAKKAJUPPURA DEPOSIT, FINLAND Laurite–erlichmanite series [(Ru,Os,Ir)(S,As)2 – (Os,Ru...micro-inclusions of zoned laurite–erlichmanite In the Kirakkajuppura deposit, laurite–erlichmanite occurs in...considerable compositional variation is observed in the laurite–erlichmanite series in this deposit (this study |
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