 | | Journal (article/letter/editorial) | | 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...strongly chloritized chromitite (Cascabulhos mine): unaltered chromite (dark core) is replaced by compact...in chromitite with carbonate veins (Cascabulhos mine): compact ferrian chromite is almost totally replaced |  | | Report (issue) | | the G and H Chromitite Zones of the Stillwater Complex, Montana GEOLOGICAL SURVEY PROFESSIONAL PAPER...the G and H Chromitite Zones of the Stillwater Complex, Montana By NORMAN J PAGE GEOLOGICAL SURVEY...THE G AND H CHROMITITE ZONES OF THE STILLWATER COMPLEX, MONTANA By NORMAN ABSTRACT Pentlandite, pyrrhotite...occur in two chromitite zones ( G and H) of the Stillwater Complex. Detailed mineralogic studies of stratigraphic...minerals have long been known to occur in the Stillwater Complex. southwestern ~fontana (Howland, 1933; |  | | Report (volume) | | Inclusions Within the B Chromitite, Stillwater Complex, Montana U.S. GEOLOGICAL SURVEY BULLETIN 1674-D...Inclusions Within the B Chromitite, Stillwater Complex, Montana By MICHAEL P. FOOSE and SUZANNE W. NICHOLSON...inclusions within the B chromitite of the Stillwater Complex, Montana, provide evidence for complex high-temperature...inclusions within the B chromitite, Stillwater Complex, Montana. (U.S. Geological Survey bulletin ; 1674-D)...Bibliography: p. 1. Sulfide minerals Montana. 2. Mineralogy Montana. SuzanneW. II. Title. III. Series. |  | Mogessie, A., Stumpfl, E. F., Weiblen, P. W. (1991) The role of fluids in the formation of platinum-group minerals, Duluth Complex, Minnesota; mineralogic, textural, and chemical evidence. Economic Geology, 86 (7) 1506-1518 doi:10.2113/gsecongeo.86.7.1506 | Journal (article/letter/editorial) | | valleriite(2(Fe,Cu)SĆ3(Mg,Fe)(OH)ā¢),violarite(FeNicS4), heazlewoodite (NiaS2),andin someinstances, graphite.Theseassociations...interpretation. Introduction Ir values for the Stillwater, Bushveld, and Duluth Complexes arecalculated...datanowavailableandpresently terns in the Bushveld, Stillwater and Duluth Com- beingacquiredfor the Duluth Complexindicatethat...sulfideore, (2) PGE associated with 910.5 for the Stillwater, and 12.66 to 20.67 for the chromespinel-richrocks...VolborthandHousley (1984) and Volborthet al. (1986) from the Stillwater Complexand by Ballhausand Stumpfl(1985, 1510 |  | | Journal (article/letter/editorial) | | pyrrhotite, chalcopyrite, pyrite, millerite, heazlewoodite, cobalt-pentlandite, polydymite, godlevskite...chalcopyrite-pyrite, chalcopyrite-cubanite, pentlandite-heazlewoodite and pentlandite-godlevskite-polydymite occur...Sciences Northwestern University Evanston, Illinais USA 60201 J. V. Smith Department of Geaphysical Sciences...Sciences University af Chicago Chicago, Illinais USA 60637 B. F. Windley Department of Gealagy University...Co-pentlandite, Di digenite, Gd godlevskite, Hz heazlewoodite, Mi millerite, Pd polydymite, Pn pentlandite |  | | Journal (article/letter/editorial) | | with metasedimentary inclusions, from the Frood Mine, Sudbury, Ontario. MRB-2 1,22, and 23 are material...pile of the Minneapolis Adit, in the Stillwater complex in Montana, selected by M. Zientek of the United...United States Geological Survey. The Sudbury ores, Stillwater ores, and SARM 7 average (OGS values, in LIGHTFOOT...Sudbury ore, and the paucity of sulphides in Stillwater reef material, is demonstrated by hand-specimen...Merensky Reef standard, and a highlyfractionated Stillwater ore. Normalized using values of NALDRETT and |  | | Journal (article/letter/editorial) | | such as the Bushveld (South Africa) and Stillwater (Montana) Complexes. In addition to the rare associated...mining in streams draining Mason Mountain, Macon County, North Carolina (Hidden 1898). It was ultimately...Centennial mines in the Medicine Bow Mountains, Albany County, Wyoming. An odd hydrothermal āveinā sperrylite...Great Eastern mine, Clark County, Nevada. It is an ore mineral in the active Pt-Pd mine and related occurrences...occurrences in the Stillwater Complex, Montana. Sperrylite was first described by H. H. Wells (1889) from |  | | Journal (article/letter/editorial) | | California at Los Angeles, Los Angeles CA 90095-1567, USA CU Center for Astrobiology and Laboratory for Atmospheric... University of Colorado, Boulder CO 80309-0392, USA a r t i c l e i n f o Article history: Received... 5251 Broad Branch Rd. NW, Washington DC 20015, USA. Tel.: +1 202 478 8900; fax: +1 202 478 8901. E-mail...7 Ga Abitibi greenstone belt. NAT2: NAT1 plus Stillwater chromitite. SYN1: a model olivine cumulate composed...glass plus San Carlos olivine. SYN2: SYN1 plus Stillwater chromitite. SiO2 Al2O3 FeO MgO CaO Na2O K2O |  | | Report (issue) | | 12 X-ray Powder Pattern: Goodnews Bay, Alaska, USA. 2.286 (100), 2.177 (90), 1.226 (70), 1.200 (70)...Total 100.4 100.3 101.8 (1) Goodnews Bay, Alaska, USA; by electron microprobe, average of four grains and...)Ī£=8.02 (Sb2.67 As0.30 Sn0.03 )Ī£=3.00 . (3) Oktyabr mine, Russia; by electron microprobe, corresponding to...(Goodnews Bay, Alaska, USA); above massive cubaniteāmooihoekite ore (Oktyabr mine, Russia). Association:...alloy, stibiopalladinite, chalcocite, bornite, heazlewoodite, galena, chalcopyrite, pentlandite, valleriite |  | | Journal (article/letter/editorial) | | anthophyllite q- calcic (pentlandite, (Fe,Ni)oSs; heazlewoodite,NiaS2; pyrrhotite,Feā¢_xS)occurin the highlyserpentinized...chlorite V Sulfide Mineralogy Pentlandite,heazlewoodite, and pyrrhotiteare the only sulfide minerals...pentlandite, Po = pyrrhotite, Hz = heazlewoodite with heazlewoodite or with pyrrhotite. Analysesof nine...thosefound for pentlanditesof various assemblages Heazlewoodite was observedin three specimens, two of which...I i i i 2.0 1.5 Ii. 0 0.5 0.0 (pentlandite,heazlewoodite,pyrrhotite). Only a very minor amount of Ni |  | | Journal (article/letter/editorial) | | as FeāNiāCr-alloys, awaruite (Ni3 Fe), and heazlewoodite (Ni3 S2 ). Carbon-bearing assemblages are better...super-reducing phases (metal alloys, awaruite, heazlewoodite), and graphite. In addition, although the origin...established in the ultrabasic complexes of Bushveld and Stillwater [13,26ā28]. Late-magmatic CāOāHāS fluids are...pentlandite occur as small inclusions in chromite, heazlewoodite (Ni3 S2 ), and chalcopyrite with traces of Ni...pentlandite occur as small inclusions in chromite, heazlewoodite millerite (NiS) in the serpentinized matrix |  | | Journal (article/letter/editorial) | | b2 phases and, eventually, the intermediate heazlewoodite, as found by Kitakaze et al. (2011). Therefore...in situ investigation); it is also called a heazlewoodite solid-solution by, e.g., Peregoedova & Ohnenstetter...captured by (Ni,Fe)36xS2 solid solution (āhigh heazlewooditeā of Peregoedova & Ohnenstetter 2002, āhigh pentlanditeā...Laļ¬amme (1974) found up to 1.5 wt.% Pd in the Stillwater pentlandite material, whereas Todd et al. (1982)...analysis of pentlandite from the J-M Reef of the Stillwater Complex with up to 3.3 wt.% Pd, and an average |  | | Journal (article/letter/editorial) | | serpentinized and carries numerous grains of heazlewoodite and millerite. In contrast the magnetite ores...is almost devoid of Co (Table 2). Secondary heazlewoodite and millerite occur in the serpentinized matrix...established in the ultrabasic complexes of Bushveld and Stillwater (Stumpfl and Rucklidge, 1982; Volborth and Housley...and Prof. A. Volborth, Montana College of Mineral Science & Technology, Butte, USA, for reading the English...mineralization in a pegmatoid pyroxenite of the Stillwater Complex, Montana, USA. TMPM 33:213-230 yon Gruenewaldt G |  | | Report (volume) | | -----------------------------------Alexo Nickel mine ____________________________________ - ___ Kenora...----------------------------------------Saline CountY--------------------------------------------Cal...---------------------------------------Boulder CountY------------------------------------------Conne...-----------------------------------------JGnox CountY--------------------------------------------Min...FredericktoVfn-------------------------------------------Montana----------------------------------------------- |  | | Journal (article/letter/editorial) | | Montana Mineral Locality Index Downloaded by [University of Nebraska, Lincoln] at 20:00 09 April 2015...2015 K NOWN AS THE TREASURE STATE, Montana is rich in mineral and gemstone localities. The state motto...The middle third of the state is known as the Montana alkali province where the sediments have MICHAEL...view showing the Indian Queen mine ca. 1905 at Farlin, Beaverhead County. 208 ROCKS & MINERALS Downloaded...mines at Butte in Silver Bow County and the Black Pine mine in Granite County have produced many fine crystal |  | | Journal (article/letter/editorial) | | Reference Greece 1) Vourinos Complex (Xerolivados Mine) this study dunite harzburgite a) native silver...Camaguey district (Guillermina Mine) troctolite Cyprus 1) Kokkinorotsos Chrome Mine dunite in harzburgite a)...spherical Panayiotou (1978) Cyprus 3) Hjipalou Mine dunite a) fluid inclusions b) silicate c) sulphide...a) olivine b) clinopyroxene (very rare) c) heazlewoodite (Ni3S2) - - Peters - - K r am e r s (1974)...silicates, but three analyses from the Stillwater Complex, Montana and Tulameen Complex, British Columbia |  | | Journal (article/letter/editorial) | | subordinate Cu-pentlandite, cubanite, samaniite, heazlewoodite and pyrite. Pentlandite, horomanite and cubanite...in the layered intrusions (e.g., Bushveld and Stillwater) and as bands or seams (banded chromitite) in...just like the chromitite seams in the Stillwater intrusion, Montana, U.S.A (Talkington and Lipin, 1986;...sulphide minerals than Cu-pentlandite, samaniite, heazlewoodite, cubanite and pyrite (Fig. 4). In the olivine...associated with pyrite blebs (Fig. 4d), where heazlewoodite is replaced pentlandite at the rim (Fig. 4e) |  | | Journal (article/letter/editorial) | | Valeria O. Krutikova d a PNK Geoscience, Tampa, FL, USA Khingan Minerals AS, Oslo, Norway c Department of...GeoScience, 9302 Brookhurst Court, Tampa, FL 33647, USA. E-mail address: pavel_k7@yahoo.com (P.K. Kepezhinskas)...serpentine, plagioclase, VCr-magnetite, digenite, heazlewoodite Chlorite, ortopyroxene, olivine, amphibole,...pyrite, sphalerite, nickeliferous sphalerite, heazlewoodite, digenite, millerite (Fig. 7d, e) and unidentified...sphalerite, Bn ā bornite, Dg ā digenite, Hzl ā heazlewoodite, Brt ā barite, Ap ā apatite, Ttn ā titanite |  | | Journal (article/letter/editorial) | | bodies that iron from biotite in the Strathcona mine at might represent sulfur extracted by gravitationSudbury...Sudbury-type characteristics of the ore in the Alexo Mine of ores are structurally controlled. Epigenetic...zonation of pentlandite, pentlandite plus heazlewoodite, heazlewoodite, and then sulfide-free rock), the total...of M.~cNAMAImine at Table 1. Sulfur isotopic data of Cornwall-type...Table 2). Unfortunately the results from the Stillwater complex, and the Mellen and Duluth gabbros are |  | | Journal (article/letter/editorial) | | Cr-spinel in association with pentlandite, heazlewoodite, accessory galena and native copper. PGE-bearing...speryllite (PtAs2) in pentlandite (Pn) and heazlewoodite (Hz), amphibole (Amph); (c) PGM in sulfides...assemblage, late sulfidesāmillerite, bornite, heazlewoodite, linnaeite-group minerals, chalcocite, covellite...series abundant in reef-type deposits (J-M reef, Stillwater pluton; Merensky reef, Bushveld) are traced along...Cabri (2002). gested for the J-M reef in the Stillwater massif, isoferroplatinum is formed by the replacement |  | | Journal (article/letter/editorial) | | Cu-rich NiāFe sulfide, millerite, bornite and heazlewoodite. Inclusions of pentlandite and unknown Cu-rich...comparable to what has been reported from the Stillwater Complex, Montana (Cabri 1981). Alloys The chemical composition...derived from adjacent Os-rich laurite (Table 6). Heazlewoodite is the PGM IN PODIFORM CHROMITITES OF THE...and Vourinos (AugĆ© 1988) ophiolites, Stillwater Complex, Montana (Talkington & Lipin 1986), and the Bird...et al. 1999b). 3. Layered intrusions: Stillwater complex, Montana (Talkington & Lipin 1986), and Bird River |  | | Journal (article/letter/editorial) | | ANALYTICAL TECHNIQUES Eighteen samples from the Elatsite mine were analyzed for their precious-metal and minor-...characteristics of the different mineralized levels in the mine. Three samples were taken from the flotation unit...(1979) reported Bi-poor grains in samples from the Stillwater Complex, these occur together with Bi-rich grains...al. 1974, Cabri 2002), and the JM Reef of the Stillwater Complex (Todd et al. 1982). It has also been...hydrothermal copper ore of the New Rambler mine, Wyoming, USA (McCallum et al. 1976). Contrary to the compositions |  | | Journal (article/letter/editorial) | | (analyses 1 and 2), millerite (analyses 3 and 4), heazlewoodite (analysis 5), undetermined Cu-rich N i - F e...chromite and olivine; 3 and 4, millerite; 5 heazlewoodite; 6-8 Cu-rich Ni-Fe sulfides with pentlandite-type...such as phlogopite or amphibole (Fig. 2a). Heazlewoodite and the Cu phases digenite, chalcocite and covellite...Compositional fields from the two layered intrusions of Stillwater (dotdashed line) and Niquelandia (continuous...achievement of sulfur saturation in the system. Heazlewoodite and digenite, that would be earlier than PGM |  | | Journal (article/letter/editorial) | | than 0.5 vol% of both varieties of chromitite. Heazlewoodite and millerite account for more than 85 vol%...revealed that Fe contents of millerite and heazlewoodite are relatively low (less than 5 wt%). Pentlandite...1989; Naldrett and yon Gruenewaldt, 1989). Heazlewoodite, millerite and awaruite (Fe-Ni alloy) occur...indicate accompanying Ni and Fe. (h) PPGM and heazlewoodite in a silicate-dominated inclusion from altered...chromite. The largest Pd-Hg phase in the center heazlewoodite grain indicates a composition close to Pd3 Hg2 |  | | Report (issue) | | August 1986, the development of a major new platinum mine was announced in South Africa (E.C.I. Hammerbeck...chromitite layer are to be exploited in the new mine to a depth of 2,700 meters below the surface. This...-----------------5. Proportions of total vvorld mine production of platinum-group metals accounted for...------------------------6. Platinum-group-metal mine production in countries having major deposits and...-----------5-6. Estimated cumulative and annual mine production of platinum-group metals: 5. For each |
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