...Eliana Satiko Mano; Laurent Caner; Sabine Petit; Arthur Pinto Chaves; André Sampaio Mexias Abstract Nickel-lateritic ore is the most common source of nickel in Brazil. The Niquelândia deposit, located in State of Goias, is one of the most famous deposits due to the large amounts of nickel...

... of a sulfide liquid. The transition zone between PGE-undepleted and PGE-depleted rocks is considered to be the most favored stratigraphic level for stratiform PGE deposits in the Niquelandia Layered Intrusion. Similar to many PGE-mineralized units in layered intrusions, the transition zone occurs close...

...F. Colin; Daniel Nahon; Jean-Jacques Trescases; A. J. Melfi Abstract Two typical lateritic weathering profiles (Jacuba and Angiquinho) from the Niquelandia Ni deposits, Brazil, were studied in order to establish the petrological relationship between the supergene Ni products and the parental...

.... , Poncelet G. & Ladrière J. ( 2000 ) Nickel, iron-containing clay minerals from Niquelandia deposit, Brazil, 1. Characterization . Applied Clay Science , 17 , 163 – 181 . Wildman W.E. , Jackson M.L. & Whittig L.D. ( 1968 ) Iron-rich montmorillonite formation...

... in the northern portion of the Brasília Fold Belt (BFB) and the central part of the Tocantins Province, between the Amazon and São Francisco cratons. The Araí Group is a sequence deposited in this intracontinental rift basin, whose evolution initiated before 1.77 Ga in the Paleoproterozoic ( Alvarenga et al...

..., and anorthosites. The mafic basal zone hosts elevated Cu and Ni sulfide concentrations, whereas chromite pods occur in the ultramafic zone of the complex ( de Oliveira et al., 1992 ). Lateritic weathering of the Proterozoic massifs has produced the world-class Niquelândia and Barro Alto Ni deposits ( Colin et al...

...., Dilek et al., 1991 ), whereas such dikes are rare or absent in typical “spreading-center” ophiolites. Many Cordilleran ophiolites characteristically display a more complex internal arrangement, with hypabyssal and extrusive rocks intruded or deposited into or on an older and more deformed sequence...

.... , 2001 ). In saprolite and kaolin deposits, the kaolinite particles are typically large (1–2 mm) and are composed of hexagonal or pseudo-hexagonal plates ( Dixon, 1989 ). In contrast, kaolinite that derives from degradation of bauxite commonly consists of small, anhedral, and platy to tubular lath-like...

... la Societé Géologique de la France , 17 , 105 – 160 . Colin , F. , Noack , Y. , Trescazes , J.-J. and Nahon , D. ( 1985 ) L’altération lateritiques debutante des pyroxenites de Jacuba, Niquelandia, Brésil . Clay Minerals , 20 , 93 – 113 . Colin , F. , Nahon...

... Survey . Butt C. R. M. & Nickel E. H. 1981 . Mineralogy and geochemistry of the weathering of the disseminated nickel sulfide deposit at Mt. Keith, Western Australia . Economic...

... Sucesso, Minas Gerais, Brazil. These nuggets are ~1 mm across, rounded in shape and display complex internal zonation ( Fig. 1 ). The Bom Sucesso area is well known to economic geologists; it hosts alluvial deposits of Pt, Pd, Au and detrital diamonds ( Cabral et al. , 2009 a ). It is important from...

... Olalla (Huelva) . Tesis Doctoral , Universidad de Bilbao , Spain , 290 p. Vieira-Coelho A.C. Ladrière J. Poncelet G. ( 2000 ): Nickel, iron-containing clay minerals from Niquelandia deposit, Brazil. 2. Behaviour under reducing conditions . Appl. Clay Sci. , 17 , 183 – 204...

... 1982 , Prichard et al. 2004 , Godel et al. 2007 ), the Platreef ( Helmy et al. 2007 , Manyeruke 2007 , Yudovskaya et al. 2011 ), and the Upper Zone ( Harney & Merkle 1990 ). Microprobe data are also available for (Pt,Pd)-bismuthotelluride minerals in the Artonvilla copper deposit...

.... (1975) Nickeliferous nontronite, A 15°A garnierite, at Niquelandia, Goias, Brazil . Clay & Clay Mineral ., v. 23 , pp. 400 – 403 . Brand , N.W. , Butt , C.R.M. and Ellias , M. (1998) Nickel laterites: classification and features . Jour. Austr. Geol. Geophys ., v. 17 , pp...

... technology . Minerals Engineering , 18 , 887 – 897 . Cabri L.J. McDonald A.M. Stanley C.J. Rudashevsky N.S. Poirier G. Durham B.R. Mungall J.E. Rudashevsky V.N. ( 2005b ) Naldrettite, Pd 2 Sb, a new intermetallic mineral from the Mesamax Northwest deposit, Ungava...

...S. K. Das; R. K. Sahoo; J. Muralidhar; B. K. Nayak Abstract In the Sukinda ultramafic belt of Orissa, significant deposits of nickeliferous laterite have formed by weathering of large chromiferous dunite-peridotite suite of rocks. Two typical laterite profiles obtained by drilling (BH-1 = 50 m...

... in which chrome spinel is common and the mineral chemistry is well documented (e.g., Henderson, 1975 ; Henderson and Wood, 1981 ; Bell and Claydon, 1992 ). Small fluvial catchments drain the intrusion, the eroded sediment being deposited in the present-day mountain streams or as offshore placer deposits...

...Jonas Mota-e-Silva; Cesar Fonseca Ferreira Filho; Maria Emilia Schutesky Della Giustina Abstract The Limoeiro deposit, located in a high-grade mobile belt of the Brasiliano orogenic cycle (650–500 Ma), represents one of the few magmatic Ni-Cu(-PGE) sulfide discoveries in recent years. The deposit...

...Jonas Mota-E-Silva; Hazel M. Prichard; Saioa SuÁrez; Cesar F. Ferreira Filho; Peter C. Fisher Abstract The effects of weathering of platinum-group minerals (PGM) in the Limoeiro nickel-copper and platinum-group element [Ni-Cu-(PGE)] deposit reveal a progressive alteration of the abundant primary...

..., hydrous Mg silicates and smectites. The formation, mineralogy and grade of the deposits are controlled by the interplay of lithology, tectonics, climate and geomorphology. Most deposits have a multi-phase development, evolving as their climatic and/or topographic environment change. The richest deposits...