 | | Journal (article/letter/editorial) | | Mineralogical characterization of the Nkamouna Co–Mn laterite ore, southeast Cameroon G. Lambiv Dzemua & S. A. Gleeson...June 2012 # Springer-Verlag 2012 Abstract The Nkamouna property is an oxide laterite deposit developed...developed on serpentinized peridotite in southeast Cameroon. It is enriched in Co and Mn, has sub-economic Ni...Museum, London SW7 5BD, UK lithiophorite makes Nkamouna ore amenable to physical beneficiation, producing...higher than the run-of-mine ore. Keywords Asbolane . Lithiophorite . Nkamouna . Cameroon . Cobalt laterite |  | | Journal (article/letter/editorial) | | Petrography, Mineralogy, and Geochemistry of the Nkamouna Serpentinite: Implications for the Formation of the Cobalt-Manganese...Cobalt-Manganese Laterite Deposit, Southeast Cameroon GIDEON LAMBIV DZEMUA† AND SARAH A. GLEESON Department...The Nkamouna Co-Mn-Ni laterite is an advanced exploration project located in southeast Cameroon. The...The deposit comprises a deep and complex laterite profile with high Co (~0.25 wt %) and Mn (1.33 wt %) contents...grade and a Ni:Co ratio of less than 3. This makes Nkamouna an unusual type of laterite deposit as it will |  | Yongue–Fouateu, R., Yemefack, M., Wouatong, A. S. L., Ndjigui, P. D., Bilong, P. (2009) Contrasted mineralogical composition of the laterite cover on serpentinites of Nkamouna-Kongo, southeast Cameroon. Clay Minerals, 44 (2) 221-237 doi:10.1180/claymin.2009.044.2.221 | Journal (article/letter/editorial) | | laterite cover on serpentinites of Nkamouna-Kongo, southeast Cameroon R. YONGUE FOUATEU1,*, M. YEMEFACK2...University of Yaoundé I, PO Box 812 Yaoundé, Cameroon, Institute of Agricultural Research for Development...Development (IRAD), PO Box 2067 Yaoundé, Cameroon, 3 Department of Earth Sciences, Faculty of Science, University...University of Dschang , PO Box 67, Dschang, Cameroon, 4 Department of Earth Sciences, Faculty of Science...Science, University of Douala, PO Box 24157 Douala, Cameroon 2 (Received 11 November 2007; revised 17 December |  | Fu, Wei, Feng, Yangyang, Luo, Peng, Zhang, Yinmeng, Huang, Xiaorong, Zeng, Xiangwei, Cai, Qian, Zhou, Yongzhang (2019) Weathering of Ophiolite Remnant and Formation of Ni Laterite in a Strong Uplifted Tectonic Region (Yuanjiang, Southwest China) Minerals, 9 (1) 51 doi:10.3390/min9010051 | Journal (article/letter/editorial) | | Formation of Ni Laterite in a Strong Uplifted Tectonic Region (Yuanjiang, Southwest China) Wei Fu 1,2, * , Yangyang...hosted within the lateritic regolith derived from serpentinite within the regional Paleo-Tethyan Ophiolite...81, UMIA values = 17–60) indicates that the serpentinite-derived regolith has experienced, at least,...continuous operation of Ni migration from the serpentinite-forming minerals to weathered minerals (goethite...tectonic setting has promoted weathering of serpentinite and supergene Ni enrichment, but is also responsible |  | Aiglsperger, Thomas, Proenza, Joaquin A., Zaccarini, Federica, Lewis, John F., Garuti, Giorgio, Labrador, Manuel, Longo, Francisco (2015) Platinum group minerals (PGM) in the Falcondo Ni-laterite deposit, Loma Caribe peridotite (Dominican Republic) Mineralium Deposita, 50 (1) 105-123 doi:10.1007/s00126-014-0520-9 | Journal (article/letter/editorial) | | Republic and developed above ophioliterelated ultramafic rocks (Loma Caribe peridotite) which crop out...mantle forming part of a dismembered ophiolite complex. It mainly consists of harzburgite with small masses...plume-related oceanic plateau basalts (Duarte Complex; upper Jurassic to lower Cretaceous) and to its...unconformably overlain by volcanic rocks: the Duarte Complex by the Peralvillo Formation (basaltic rocks; Late...diabases, and basalts emerge as the Río Verde Complex (Fig. 1; Lewis et al. 2002; Escuder Viruete et |  | Aye, Beyanu Anehumbu, Sababa, Elisé, Ndjigui, Paul-Désiré (2017) Geochemistry of S, Cu, Ni, Cr and Au-PGE in the garnet amphibolites from the Akom II area in the Archaean Congo Craton, Southern Cameroon. Geochemistry, 77 (1) 81-93 doi:10.1016/j.chemer.2017.01.009 | Journal (article/letter/editorial) | | II area in the Archaean Congo Craton, Southern Cameroon Beyanu Anehumbu Aye, Elisé Sababa, Paul-Désiré...University of Yaoundé 1, P.O. Box: 812, Yaoundé, Cameroon a r t i c l e i n f o Article history: Received...reef and (ii) UG2 chromitite reefs of Bushveld complex, South Africa; (iii) Main Sulfide zone of the Great...(iv) JohnsManville (JM) reef of the Stillwater complex, USA; and (v) ∗ Corresponding author. E-mail address:...II area in the Archaean Congo Craton, Southern Cameroon. Chemie Erde - Geochemistry (2017), http://dx |  | | Journal (article/letter/editorial) | | Ni deposits are rare and their identification in complex. Their geology and petrogenesis has not been well...geometric re-arrangement, intrusion related events and complex metamorphic histories), conceptually, ophiolitic...nickel are exploration targets elsewhere in the region (e.g., Wowo Gap, lateritic nickel, 120 Mt at 1...the KFZ are steeply dipping to vertical in the region. North of the KFZ, a diverse sequence of Jurassic–Cretaceous...grained serpentinite with coarse grained chlorite–apatite–magnetite Fine grained serpentinite bearing |  | Oppermann, L., Junge, M., Schuth, S., Holtz, F., Schwarz-Schampera, U., Sauheitl, L. (2017) Mobility and distribution of palladium and platinum in soils above Lower and Middle Group chromitites of the western Bushveld Complex, South Africa. South African Journal of Geology, 120 (4) 511-524 doi:10.25131/gssajg.120.4.511 | Journal (article/letter/editorial) | | Middle Group chromitites of the western Bushveld Complex, South Africa L. Oppermann Leibniz Universität...Group (LG) and Middle Group (MG) of the Bushveld Complex in South Africa are mined for chromite but have...LG and MG chromitites of the Thaba Mine (western Bushveld Complex) is investigated, with a special focus...MIDDLE GROUP CHROMITITES OF THE WESTERN BUSHVELD COMPLEX, SOUTH AFRICA to humic acids. Palladium is mobilized...intrusions such as the Bushveld Complex in South Africa. The Bushveld Complex is the largest layered mafic-ultramafic |  | Dublet, Gabrielle, Juillot, Farid, Brest, Jessica, Noël, Vincent, Fritsch, Emmanuel, Proux, Olivier, Olivi, Luca, Ploquin, Florian, Morin, Guillaume (2017) Vertical changes of the Co and Mn speciation along a lateritic regolith developed on peridotites (New Caledonia) Geochimica et Cosmochimica Acta, 217. 1-15 doi:10.1016/j.gca.2017.07.010 | Journal (article/letter/editorial) | | Monchoux, 1991), Cuba (RoqueRosell et al., 2010) and Cameroon (Dzemua et al., 2013). However, selective chemical...knowledge, the effect of the weathering of these ultramafic rocks on the evolution of Co and Mn speciation...incised peneplain capped by an iron pan in the Goro region (Southern Province; Figure 1). A previous study...2010), Philippines (Fan and Gerson, 2011) and Cameroon (Yongue-Fouateu et al. 2006, Dzemua et al., 2013)...mineralization factors of laterites derived from ultramafic rocks of New-Caledonia. CNRT is a Public Interest |  | | Report (issue) | | .pdf. Cover. Underground photo of the Skuterud Mine in Norway showing pink secondary erythrite (a hydrated.......................................F13 Typical Mine Life.......................................................................................F15 Ultramafic Igneous Rocks..............................................................................F16 Mine Waste Characteristics.........................................................................F18 Mine Closure........................................ |  | | Journal (article/letter/editorial) | | platinum-group minerals of the Freetown Layered Complex, Sierra Leone. 1 John F.W. Bowles1, Saioa Suárez2...1180/minmag.2017.081.032 The PGM from the Freetown Complex have been examined in detail from the Babadori... in Borneo (Burgath, 1988); serpentinite lateritic coatings in Cameroon (Ndjigui and Bilong, 2010); lateritic...weathered Yubdo ultramafic intrusion, Ethiopia (Belete et al., 2000, 2002), the Uktus Complex in Central Urals...found in the westward draining streams of the complex and, by 1949, 5242 oz of platinum concentrate had |  | | Report (issue) | | Its presence may indicate significant mafic-ultramafic rocks in the local basement. The balance of primary...arc and rift environments associated with mafic-ultramafic rocks. Metasedimentary cobalt-copper-gold deposits...these deposit types show direct links to mafic-ultramafic rocks; the deposits may result from crustal-scale...depths. Hydrothermal deposits associated with ultramafic rocks, typified by the Bou Azzer district of...Archean and Proterozoic rocks of the Midwest and the east coast (Pennsylvania) and younger mafic rocks in |  | Dybowska, Agnieszka, Schofield, Paul, Newsome, Laura, Herrington, Richard, Mosselmans, Julian, Kaulich, Burkhard, Kazemian, Majid, Araki, Tohru, Skiggs, Thomas, Kruger, Jens, Oxley, Anne, Norman, Rachel, Lloyd, Jonathan (2022) Evolution of the Piauí Laterite, Brazil: Mineralogical, Geochemical and Geomicrobiological Mechanisms for Cobalt and Nickel Enrichment. Minerals, 12 (10) 1298 doi:10.3390/min12101298 | Journal (article/letter/editorial) | | are associated with both the original intrusive complex and also the nature of fluid flow, redox cycling...serpentine and chlorite dominated saprolite and the serpentinite protolith. Not all of these units are ‘ore bearing’...environments through extensive weathering of ultramafic rocks. Variations in climate, weathering and...Kazakhstan, Russia, Turkey, Greece, and the Balkan region of Europe e.g., [11,14,16], and these deposits...after [24]. (B) A geological map of the Brejo Seco Complex with the location of the Piauí deposit shown by |  | | Journal (article/letter/editorial) | | sulfides and Pt–Fe alloys in the Freetown Layered Complex, Sierra Leone John F. W. Bowles 1 & Saioa Suárez...saprolite from Horizon B of the Freetown Layered Complex contain platinum-group minerals (PGM). The PGM...weathering of the horizons. Geology The Freetown Complex in Sierra Leone is a layered intrusion formed of...al. 1977; Chalokwu et al. 1995). On land, the complex consists of a 7-km-thick sequence of gabbroic,...drained to the west by the Alako river and to the east by the Big Water; platinum was recovered from both |  | | Journal (article/letter/editorial) | | mantle sequence (the Semail ophiolite) onto the East Arabian margin during the Late Cretaceous. The laterites...concentrations average 0.63% (Ibra), 0.72% (3 profiles, East Ibra), 0.67% (3 profiles, Al-Russayl), and 0.33%...Ni-bearing minerals. This study showed that the Ibra, East Ibra and Tiwi laterites are similar to the other...development of the laterites in the Oman Mountain region has been given in Lippard et al. (1986), Skelton...areas, namely Ibra (N 22°48′14.3″/E 58°45′1.5″), East Ibra (N 22°49′49.7″/E 58°50′51.9″), Tiwi (N 22°47′48 |  | Aiglsperger, Thomas, Proenza, Joaquin A., Lewis, John F., Labrador, Manuel, Svojtka, Martin, Rojas-Purón, Arturo, Longo, Francisco, Ďurišová, Jana (2016) Critical metals (REE, Sc, PGE) in Ni laterites from Cuba and the Dominican Republic. Ore Geology Reviews, 73. 127-147 doi:10.1016/j.oregeorev.2015.10.010 | Journal (article/letter/editorial) | | major AC ore deposits in South Africa (Bushveld complex) and Russia (Norilsk) (USGS 2013). Supply risks...instabilities can occur when producers suffer full-scale mine shutdowns as seen during several strikes held by...associated with near-surface modification of ultramafic rocks could help to minimize supply risks of...laterites have developed from weathering of hydrated ultramafic rocks of the Moa-Baracoa ophiolitic massif. This...Marchesi et al., 2006; Proenza et al., 2006). The ultramafic rocks are mainly harzburgites (more than 70%) |  | Economou-Eliopoulos, Maria, Laskou, Magdalena, Eliopoulos, Demetrios, Megremi, Ifigeneia, Kalatha, Sofia, Eliopoulos, George (2021) Origin of Critical Metals in Fe–Ni Laterites from the Balkan Peninsula: Opportunities and Environmental Risk. Minerals, 11 (9) 1009 doi:10.3390/min11091009 | Journal (article/letter/editorial) | | water leachates for laterite samples, altered ultramafic rocks and soils neighboring the mining areas...laterites developed by chemical weathering of ultramafic rocks with potential post redeposition enrichment...weathering/alteration of laterite deposits and parent ultramafic rocks, mining, and large volumes of smelting...mainly related to the extensive lateritization of ultramafic ophiolites in the Balkan Peninsula (Shebenik–Pogradec...Upper Jurassic–Lower Cretaceous serpentinized ultramafic ophiolites, may be partially preserved in situ |  | | Journal (article/letter/editorial) | | Serpentinites are formed by hydrothermal metamorphism of ultramafic rocks such as peridotites and pyroxenites. During...During the metamorphism, the anhydrous ultramafic rocks become more hydrous and Ca content decreases,...contributed significantly to the understanding of serpentinite weathering and associated environmental consequences...Ni into ecosystems during serpentinite weathering suggests that serpentinite landscapes are a possible...the world’s rice-growing area occurring in this region (Kyuma, 2004). Serpentinitic landscapes are found |  | Van Cromphaut, C., Van Ranst, E., De Resende, V. G., Vandenberghe, R. E., De Grave, E., Lambiv Dzemua, G. (2008) Characterization by Mössbauer spectroscopy of Fe phases in highly weathered serpentinitic soil from southern Cameroon. Clay Minerals, 43 (1) 117-128 doi:10.1180/claymin.2008.043.1.09 | Journal (article/letter/editorial) | | highly weathered serpentinitic soil from southern Cameroon C. VAN CROMPHAUT1,*, E. VAN RANST2, V. G. DE RESENDE1...Ghent, Belgium, and 3 Geovic Cameroon PLC, BP 11555, Yaounde, Cameroon 2 (Received 1 April 2007; revised...serpentinized ultrabasic intrusive rocks of southern Cameroon has received considerable attention from mining...mineralogical assemblage of a highly weathered serpentinite soil profile from the area. This study focuses...pedimentation. KEYWORDS: serpentinitic soil, Cameroon, Mössbauer spectroscopy, X-ray diffraction. |  | | Journal (article/letter/editorial) | | mantle sequence (the Semail ophiolite) onto the East Arabian margin during the late Cretaceous. The laterites... Ni concentrations average 0.63% (Ibra), 0.72% (East Ibra), 0.67% (Al-Russayl), and 0.33% (Tiwi). Other...Al-Khirbash (2015) concluding that the Ibra and East Ibra laterites are of the silicate type, while that...(1998). To attain a better understanding of the complex processes involved in laterite formation and the...study belonged to four separate areas, namely Ibra, East Ibra, Tiwi, and Al-Russayl. The Ibra profile is located |  | Mongelli, Giovanni, Taghipour, Batoul, Sinisi, Rosa, Khadivar, Shirin (2019) Mineralization and element redistribution in the Chah-Gheib Ni-laterite ore zone, Bavanat, Zagros Belt, Iran. Ore Geology Reviews, 111. 102990 doi:10.1016/j.oregeorev.2019.102990 | Journal (article/letter/editorial) | | derived from the weathering of ± serpentinized ultramafic 12 rocks and they commonly accounts for over...world land-based Ni resources. Serpentinized 13 ultramafic rocks outcrop extensively in Iran as result of...Two Ni-bearing laterite belts developed on the ultramafic 15 rocks of the Neyriz ophiolite have been...been recently discovered in the Bavanat region (South Iran). The 16 Chah-Gheib deposit, as the biggest...the chemical weathering of serpentinized 47 ultramafic lithologies (Freyssinet et al., 2005, Butt and |  | Kotzé, Emmylou, Schuth, Stephan, Goldmann, Simon, Winkler, Benjamin, Botcharnikov, Roman E., Holtz, François (2019) The mobility of palladium and platinum in the presence of humic acids: An experimental study. Chemical Geology, 514. 65-78 doi:10.1016/j.chemgeo.2019.03.028 | Journal (article/letter/editorial) | | environment in the area of the Bushveld Igneous Complex, South Africa, humic acid solutions were prepared...PGE-mineralized chromite reefs of the Bushveld Igneous Complex (BIC), and found that Pt was present in concentrations...Oberthür et al., 2003, 2013), and the Bushveld Complex (Oppermann et al., 2017). Fuchs and Rose (1974)...analyses, the signal of 194Pt+ is interfered by the complex 178Hf16O+, and similarly, 195Pt+ is affected by...0.95. The solutions containing PtS displayed a complex evolution of the Pt concentration from one aliquot |  | | Journal (article/letter/editorial) | | high concentrations of Co (up to 34,400 mg/L in mine water, 14,165 mg/kg in tailings, 21,134 mg/kg in...have been documented. Co is contained in ore and mine waste in a wide variety of primary (e.g., cobaltite...Hudson-Edwards, K.A. Geochemistry, Keywords: cobalt; mine waste; tailings; erythrite; heterogenite; biogeochemistry...mobility within tailings, soils, smelter waste, and mine waters [10–12]. This paper will review the geochemistry...the major controls on Co uptake and mobility in mine-affected waters, soils, sediments, plants, minerals |  | | Journal (article/letter/editorial) | | formed as a result of chemical weathering of ultramafic rocks (e.g. Freyssinet et al., 2005 and Butt...world's Ni resources are found in the Caribbean region, and the Falcondo deposit is one of the largest...been studied. The Ni-laterites from the Caribbean region have been widely studied recently (Lewis et al...agreement with the dissolution of the primary ultramafic rock leading to the progressive silicification...are likely to be weathered when the ophiolite complex is exposed to the intense rainfall and temperatures |  | Ito, Akane, Otake, Tsubasa, Maulana, Adi, Sanematsu, Kenzo, Sufriadin, , Sato, Tsutomu (2021) Geochemical constraints on the mobilization of Ni and critical metals in laterite deposits, Sulawesi, Indonesia: A mass‐balance approach. Resource Geology, 71 (3) 255-282 doi:10.1111/rge.12266 | Journal (article/letter/editorial) | | calculation, nickel laterite, supergene enrichment, ultramafic rock 1 | INTRODUCTION Nickel laterite deposits...by intensive chemical weathering of mafic to ultramafic rocks under tropical environments, account for...chemical weathering, meteoric waters interact with ultramafic rocks, leading to the dissolution of primary...It contains four lithotectonic belts from west to east: the West Sulawesi Plutono-Volcanic Arc Belt, the...the Central Sulawesi Metamorphic Belt, the East Sulawesi Ophiolite (ESO) Belt, and continental fragments |
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