 | AugĆ©, Thierry, Gloaguen, Ćric, Chevillard, Matthieu, Bailly, Laurent (2018) Mineralogy, geochemistry and emplacement of the Conakry Igneous Complex, Guinea: implications for the NiāCuāPGE mineralization. Mineralogical Magazine, 82 (3) 593-624 doi:10.1180/mgm.2018.79 | Journal (article/letter/editorial) | | geochemistry, and emplacement of the Conakry Igneous Complex, Guinea: implications for the Ni-Cu-(PGE) mineralization...1180/mgm.2018.79. Abstract The Conakry Igneous Complex (CIC) is a mafic-ultramafic intrusion emplaced...contemporaneously with the opening of the Atlantic, forming a complex, 55 x 5 km dyke-like body within which three main...sulfides (BMS) are present in all units of the complex and earlier descriptions have mentioned a āmassive...composite Ni-Fe-Cu sulfides. Most PGM grains form complex associations resulting either from exsolution or |  | | Journal (article/letter/editorial) | | PGM grains associated with the Freetown Layered Complex, Sierra Leone, and their origin Keiko Hattori...(residual) origin, associated with the Freetown Layered Gabbro Complex, were determined in-situ using an ion...systematic mineralogical and chemical changes of the Complex and extensive granulitization in the adjacent host...1988). The P G M grains in Sierra Leone occur in laterites covering a layered ultramafic intrusion and...without surface abrasion. The tropical climate in the area was proposed to be conducive to the formation of |  | Bowles, J. F. W., Prichard, H. M., Suarez, S., Fisher, P. C. (2013) THE FIRST REPORT OF PLATINUM-GROUP MINERALS IN MAGNETITE-BEARING GABBRO, FREETOWN LAYERED COMPLEX, SIERRA LEONE: OCCURRENCES AND GENESIS. The Canadian Mineralogist, 51 (3) 455-473 doi:10.3749/canmin.51.3.455 | Journal (article/letter/editorial) | | MINERALS IN MAGNETITE-BEARING GABBRO, FREETOWN LAYERED COMPLEX, SIERRA LEONE: OCCURRENCES AND GENESIS John F...magnetite-bearing gabbroic rocks of the Freetown Layered Complex, Sierra Leone for the first time. The PGM occurrences...smaller than the eluvial and alluvial PGM of the Freetown complex, which are predominantly Pt-Fe alloys, laurite...has yet been discovered. Previous studies of this area have suggested that secondary remobilization of...are compositionally distinct. Keywords: Freetown, Sierra Leone, platinum-group minerals, primary occurrence |  | | Journal (article/letter/editorial) | | platinum-group minerals of the Freetown Layered Complex, Sierra Leone. 1 John F.W. Bowles1, Saioa SuĆ”rez2...rivers and river terraces near York, Freetown Peninsula, Sierra Leone have been examined for their platinum-group...primary and placer PGM support the proposal that the Freetown nuggets developed as a result of breakdown of...Keywords: Platinum-group minerals ā¢ Freetown Intrusion, Sierra Leone ā¢ Alluvial ā¢ Nuggets Introduction...Introduction Alluvial PGM in the western hills of the Freetown Peninsula, Sierra Leone, W Africa were first found |  | Prichard, Hazel M., SuĆ”rez, Saioa, Fisher, Peter C., Knight, Robert D., Watson, John S. (2018) Placer platinum-group minerals in the Shetland ophiolite complex derived from anomalously enriched podiform chromitites. Mineralogical Magazine, 82 (3) 491-514 doi:10.1180/minmag.2017.081.099 | Journal (article/letter/editorial) | | PLATINUM-GROUP MINERALS IN THE SHETLAND OPHIOLITE COMPLEX DERIVED FROM ANOMALOUSLY ENRICHED PODIFORM CHROMITITES...Harold's Grave localities in the Shetland ophiolite complex have been well documented previously. The focus...recovered reflecting the limited release of IPGM from chromite grains in the rocks. In this cold climate with...surficial conditions. Keywords: Shetland ophiolite complex, Cliff, Harold's Grave, alluvial concentrates,...mantle and crustal ultramafics contain disseminated chromite and there are a number of podiform chromitites |  | | Journal (article/letter/editorial) | | Indonesia/Malaysia. The Osisotope ratios of laurite grains in chromite d e f n e an t87Os/186Os ratio for the 100 Ma...Indonesia, Malaysia. Introduction Geology of the area THE 1870S/186Os ratios of crustal rocks are much...chromitites of an Alpine-type ultramafic-mafic complex and of PGM from the associated placers on Borneo...Cretaceous crystalline schists. The rocks in the area are highly deformed and segments of different lithologies...Cretaceous at around 114 Ma (Burgath, 1988). The area was later intruded by numerous calc- Mineralogical |  | | Journal (article/letter/editorial) | | sulfides and PtāFe alloys in the Freetown Layered Complex, Sierra Leone John F. W. Bowles 1 & Saioa SuĆ”rez...rocks and saprolite from Horizon B of the Freetown Layered Complex contain platinum-group minerals (PGM)...Keywords Platinum-group minerals . Freetown intrusion . Sierra Leone . Weathering . Mobility of platinum...and alluvial deposits from the Freetown Layered Intrusion in Sierra Leone, West Africa, since 1926 and...Pollett 1931, 1951). The weathered covering of the Freetown intrusion consists of low-grade bauxitic laterites |  | | Journal (article/letter/editorial) | | element (PGE) research beyond the narrow confines of layered intrusions and turn it into the broad field of...Cardiff on topics ranging from PGE in ophiolites and layered intrusions, gossan formation and Au mineralization...OāDriscoll et al. article (Cliff) is the classic area where Hazel discovered such anomalously high Pt...other PGM found in two Russian localities; the Western Sayan province and in Chelyabinsk Oblast (southern...the Loma Caribe peridotite (Dominican Republic). Layered intrusion-related PGM are represented by three |  | Wilhelm, H. J., Zhang, H., Chen, F. L., Elsenbroek, J. H., Lombard, M., de Bruin, D. (1997) Geochemical exploration for platinum-group elements in the Bushveld Complex, South Africa. Mineralium Deposita, 32 (4) 349-361 doi:10.1007/s001260050101 | Journal (article/letter/editorial) | | exploration for platinum-group elements in the Bushveld Complex, South Africa Received: 31 May 1996 / Accepted:...stream sediment and soil samples from the Bushveld Complex, South Africa have revealed enhanced precious metal...hosted by the Upper Critical Zone of the Rustenburg Layered Suite are revealed by a high PGE and Au content...follows the igneous layering of the Rustenburg Layered Suite and is oĀset by the Brits Graben. It is therefore...Rustenburg Layered Suite of the Bushveld Complex comprises the world's largest maĀ®c-ultramaĀ®c layered intrusion |  | Zaccarini, Federica, Bindi, Luca, Pushkarev, Evgeny, Garuti, Giorgio, Bakker, Ronald J. (2016) Multi-Analytical Characterization of Minerals of the BowieiteāKashinite Series From the Svetly Bor Complex, Urals, Russia, and Comparison With Worldwide Occurrences. The Canadian Mineralogist, 54 (2) 461-473 doi:10.3749/canmin.1500021 | Journal (article/letter/editorial) | | BOWIEITEā KASHINITE SERIES FROM THE SVETLY BOR COMPLEX, URALS, RUSSIA, AND COMPARISON WITH WORLDWIDE OCCURRENCES...ultramaļ¬c rocks associated with the Gusevogorskiy Complex in the Urals. Cabri et al. (1981) reported on the...the concentrically zoned maļ¬c-ultramaļ¬c Gaosital Complex in China. This Rh2S3 phase, however, was ofļ¬cially...Dominican Republic, as an inclusion in a disseminated chromite grain (Aiglsperger et al. 2015), in an ultramaļ¬c...magnetite-bearing gabbros from the Freetown Layered Complex of Sierra Leone (Bowles et al. 2013). Kashinite |  | | Journal (article/letter/editorial) | | STEPHEN J. BARNES and BELINDA GODEL: A mechanism for chromite growth in ophiolite complexes: evidence from 3D...high-resolution X-ray computed tomography images of chromite grains in Haroldās Grave chromitite in the Shetland...the Cliff chromitites of the Shetland Ophiolite Complex, Scotland 471 HAZEL M. PRICHARD, SAIOA SUĆREZ...platinum-group minerals in the Shetland ophiolite complex derived from anomalously enriched podiform chromitites...associations of platinum-group minerals at Rudnaya, western Sayans and Miass, southern Urals, Russia 515 |  | | Journal (article/letter/editorial) | | Oxidized Ores into Placers: Case Studies Bushveld Complex, South Africa, and Great Dyke, Zimbabwe Thomas...(PGM) in the weathering cycle in the Bushveld Complex of South Africa and the Great Dyke of Zimbabwe...worldās prime sources of platinum-group (PGE) are layered intrusions of Proterozoic crystallites, or rarely...detrital/allogenic PGM and Archean age (e.g., Bushveld Complex, South Africa; the Great Dyke, Zimbabwe; the Stillwater...In the Bushveld/Great Dyke scenario, and in all Complex, USA). Placer deposits in Russia and in Colombia |  | | Journal (article/letter/editorial) | | less than 10 lm, occasionally up to 100 lm) in chromite. The origin of coarse-grained PGM, in the form...extremely large IPGM grains (up to 1.3 mm) in chromite ores related to ophiolites was found to be approximately...and in laterites related with the Freetown layered gabbro, Sierra Leone and many other deposits worldwide...than 10 lm, occasionally up to 100 lm) within chromite grains in many maļ¬cāultramaļ¬c complexes, including...al., 2005). Alluvial PGM from the Freetown intrusion, Sierra Leone have been described by Bowles (1986) |  | | Journal (article/letter/editorial) | | School of Earth and Environment, The University of Western Australia, Crawley, WA 6009, Australia School of...School of Earth and Environment, The University of Western Australia, Crawley, WA 6009, Australia a r t i...School of Earth and Environment, The University of Western Australia, Crawley, WA 6009, Australia. E-mail...During the Pan-African Orogeny, chromite, zinc and platinum in layered maļ¬c intrusions were emplaced,...Guinea), chromite, nickelācobalt, diamonds (e.g., Mano River in Liberia or Koidu Pipe in Sierra Leone) and |  | | Journal (article/letter/editorial) | | P7B 5E1, Canada p. a. williams, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia...STEPHEN J. BARNES and BELINDA GODEL: A mechanism for chromite growth in ophiolite complexes: evidence from 3D...high-resolution X-ray computed tomography images of chromite grains in Haroldās Grave chromitite in the Shetland...the Cliff chromitites of the Shetland Ophiolite Complex, Scotland 471 HAZEL M. PRICHARD, SAIOA SUĆREZ...platinum-group minerals in the Shetland ophiolite complex derived from anomalously enriched podiform chromitites |  | | Journal (article/letter/editorial) | | A L O G Y OF THE FREETOWN L A Y E R E D BASIC IGNEOUS COMPLEX OF S I E R R A LEONE A.C. UMEJI Department...Geochemistry and mineralogy of the Freetown layered basic igneous complex of Sierra Leone. Chem. Geol., 39: 17--38...17--38. The northern part of the Freetown tholeiitic layered complex is mapped. This lowermost exposed part...Ni and Zn and enrichment in Sr upward in each layered unit. The abundances of trace elements which are...fractions. The investigation reveals that the layered units are replicas produced by pulses from one |  | Gunn, A.G., Dorbor, J.K., Mankelow, J.M., Lusty, P.A.J., Deady, E.A., Shaw, R.A., Goodenough, K.M. (2018) A review of the mineral potential of Liberia. Ore Geology Reviews, 101. 413-431 doi:10.1016/j.oregeorev.2018.07.021 | Journal (article/letter/editorial) | | mining commenced at the New Liberty deposit in western Liberia in 2015, while significant gold resources...some of them previously mined, include Bong, the Western Cluster, Putu and Goe Fantro. There is a long history...history of alluvial diamond production in western and central Liberia, together with more than 160 known...Mano Godua and Weasua, close to the border with Sierra Leone. Many of these are considered to be part of...includes Jurassic age diamondiferous kimberlites in Sierra Leone and Guinea. Deposits and occurrences of a wide |  | | Journal (article/letter/editorial) | | School of Earth and Environment, The University of Western Australia, M004, Crawley, 8 b 9 2050, Republic...Johannesburg, PBag 3, WITS, an 10 11 c 12 Western Australia, Crawley, WA 6009, Australia; Email:...School of Earth and Environment, The University of Western 17 Australia, M004, Crawley, WA 6009, Australia;...and Paleoproterozoic rocks that crop out over an area of approximately 76 4.5 million km2. The craton...domain in the south. In both 78 shields the western portion consists of Archean rocks that are separated |  | | Journal (article/letter/editorial) | | (or otherwise) the association of OsRu-Ir with chromite and Pt-Pd-Ir with sulphides; for example the papers...groundwater transport of PGEs in Sierra Leone above the Freetown Layered Complex. Evidence for fluid beneath |  | | Journal (article/letter/editorial) | | of BM-PGE sulĀ®des are described from podiform chromite occurrences in ultramaĀ®c portions of ophiolite...Ā Cu, Ni, Fe and B Ā Ir, Rh, Pt) is present in complex assemblages in Kraubath, usually intergrown with...sulĀ®de liquids after cooling and equilibration in chromite-precipitating magmatic systems. Zusammenfassung...element substitutions. Geological setting and chromite petrography Kempirsai (Kazakhstan) is the largest...(up to 2000 m long and 230 m thick) of podiform chromite are present in the southeastern part of the massif |  | Airiyants, Evgeniya V., Belyanin, Dmitriy K., Zhmodik, Sergei M., Agafonov, Leonid V., Romashkin, Pavel A. (2020) Chemical composition and origin of platinum-group minerals from placers of the Aunik River, Buryatia, Russia. Ore Geology Reviews, 120. 103453 doi:10.1016/j.oregeorev.2020.103453 | Journal (article/letter/editorial) | | studied. The present study of PGM grains reveals complex relationships between the mineral phases within...available on the distribution and origin of PGM in western Transbaikalia, and specifically, in the Bauntovsky...generalized overview of the distribution of the PGMs in Western Transbaikalia. Placer mineralization has been briefly...meta-gabbro, which together form the Shamansky ophiolite complex (Fig. 2). In the absence of systematic mineralogical...V. Airiyants, et al. Fig. 1. Overview map of Western Transbaikalia, showing the Udino-Vitim island arc |  | 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) | | IN THE KIRAKKAJUPPURA PGE DEPOSIT, PENIKAT LAYERED COMPLEX, FINLAND ANDREI Y. BARKOVĀ§ AND MICHAEL E. FLEET...FLEET Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada ROBERT...species occur in the Kirakkajuppura area, Penikat layered complex, Finland. The PGM are intimately associated...is located near the northern end of the Penikat complex. Keywords: platinum-group elements, platinum-group...mineralization, Kirakkajuppura deposit, Penikat layered complex, Fennoscandian Shield, Finland. SOMMAIRE On |  | Prichard, Hazel M., Mondal, Sisir K., Mukherjee, Ria, Fisher, Peter C., Giles, Nicolas (2018) Geochemistry and mineralogy of Pd in the magnetitite layer within the upper gabbro of the Mesoarchean Nuasahi Massif (Orissa, India) Mineralium Deposita, 53 (4) 547-564 doi:10.1007/s00126-017-0754-4 | Journal (article/letter/editorial) | | layer occurs at a high stratigraphic level in the complex and is nearly 4-km long and 5ā12-m thick. The sections...Pd-oxides. The Nuasahi Massif is a sill-like Archean layered ultramafic-mafic intrusion genetically linked to... Magnetitite . Chromitite . Sill-like layered igneous complex . Upper gabbro unit . Nuasahi Massif Introduction...parts of layered complexes worldwide. Some of the more well-known ones include the Bushveld Complex (Barnes...(Barnes et al. 2004) and the Stella Complex (Maier et al. 2003) both in the Republic of South Africa, the |  | Slansky, E., Barron, L. M., Suppel, D., Johan, Z., Ohnenstetter, M. (1991) Platinum mineralization in the Alaskan-type intrusive complexes near Fifield, N.S.W., Australia. Part 2. Platinum-group minerals in placer deposits at Fifield. Mineralogy and Petrology, 43 (3) 161-180 doi:10.1007/bf01166889 | Journal (article/letter/editorial) | | furnished the largest quantity of platinum from the area. PGM nuggets were collected in a corridor, south...nuggets sometimes carry inclusions of euhedral chromite. Two sulphidic phases--laurite and bowieite--are...laterite or the erosive profile. The presence of chromite inclusions of a certain diagnostic composition...in Placer Deposits at Fifield 163 toOWENDALE complex ~ad e ~P 6 ~ 1km Iotin I Fig. 1. Sketch map...distance from Fifield to the Owendale intrusive complex with hard rock PGE mineralization (Johanet al. |  | | Journal (article/letter/editorial) | | Zoned Laurite from the Merensky Reef, Bushveld Complex, South Africa: āHydrothermalā in Origin? Federica...laurite found in the Merensky Reef of the Bushveld layered intrusion, South Africa. The zoned laurite forms...Merensky Reef zoned laurite with those found in the layered chromitites of the Bushveld and podiform chromitites...group minerals (PGM); Merensky Reef; Bushveld Complex; South Africa 1. Introduction Minerals of ruthenium...typical mode of occurrence, i.e., included in chromite grains, indicate that they crystallized at high |
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