 | | Journal (article/letter/editorial) | | Petrography, Mineralogy, and Geochemistry of the Nkamouna Serpentinite: Implications for the Formation of...the 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 |  | 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...ore, two phyllosilicate minerals (serpentine and talc) are the Ni-host minerals. Their Ni compositions...34–1.2 wt % Ni) has a higher Ni concentration than talc (0.18–0.26 wt % Ni), indicating that the serpentine...during weathering process compared to talc. This explains why talc veining reduces Ni grade. The geochemical...China 1. Introduction Chemical weathering of ultramafic rocks has produced numerous lateritic profiles |  | 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 |  | 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...chromite (#00-034-0140), gibbsite (#00-029-0041), talc (#00-019-0770), quartz (#00005-0490), asbolane (#00-043-1459)...secondary phyllosilicates (mostly serpentine-like and talc-like minerals; Fritsch et al. 2015) and goethite |  | Domènech, Cristina, Villanova-de-Benavent, Cristina, Proenza, Joaquín A., Tauler, Esperança, Lara, Laura, Galí, Salvador, Soler, Josep M., Campeny, Marc, Ibañez-Insa, Jordi (2022) Co–Mn Mineralisations in the Ni Laterite Deposits of Loma Caribe (Dominican Republic) and Loma de Hierro (Venezuela) Minerals, 12 (8) 927 doi:10.3390/min12080927 | Journal (article/letter/editorial) | | magmatic Ni–Cu sulphide deposits hosted in mafic and ultramafic rocks, such as Sudbury (Canada) or Norilsk (Russia)...Indonesia, the Philippines, Brazil, Cameroon, Greece and the Caribbean region ([2,3,6] and references therein)...laterite deposits result from the weathering of ultramafic rocks (generally serpentinised peridotites) at...low grade, its irregular distribution, and the complex mineralogy of the ores, the Co-production from...in Australia, Goro in New Caledonia, or Nkamouna in Cameroon) [2]. However, recent studies have pointed |  | | 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...most compositions plotting in the penninite and talc–chlorite fields of Hey (1954). Representative compositions |  | | 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 |  | | 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%...serpentine and talc are the main Ni-bearing minerals. This study showed that the Ibra, East Ibra and Tiwi...Mg-silicates (type A) Ni deposits, where nickel-bearing talc (willemseite) or chlorite, and serpentine (nepouite...development of the laterites in the Oman Mountain region has been given in Lippard et al. (1986), Skelton |  | 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 |  | 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...phyllosilicates (0.1–25 wt%) including serpentines, talc and pimelite, goethite (up to 9 wt%), magnetite...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 |  | | 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) | | 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 |  | 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%) |  | | Journal (article/letter/editorial) | | with smaller amounts of pyroxene, amphibole, and talc. Progressive weathering and the release of cations...C horizons. Serpentine, pyroxene, amphibole, and talc are proposed to be transformed to low-charge smectite...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,...minor amounts of chromite, magnetite, brucite, and talc (McGahan et al., 2008, 2009; Morrison et al., 2009) |  | 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 |  | | 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...Ni)3Si2O5(OH)4), kerolite-pimelite (invalid names for hydrated talc-like phases with the formula (Mg,Ni)3Si4O10(OH)2·n(H2O))...developing first, followed by the precipitation of the talc-like phase, subsequent formation of the sepiolite-falcondoite...done by means of bulk analysis on serpentine- and talc-like garnierite samples (Manceau et al., 1985, 1986 |  | 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...phyllosilicates (e.g., serpentine, smectite, and talc-like minerals) in the saprolite horizon. This supergene...It contains four lithotectonic belts from west to east: the West Sulawesi Plutono-Volcanic Arc Belt, the |  | Dublet, Gabrielle, Juillot, Farid, Morin, Guillaume, Fritsch, Emmanuel, Fandeur, Dik, Ona-Nguema, Georges, Brown, Gordon E. (2012) Ni speciation in a New Caledonian lateritic regolith: A quantitative X-ray absorption spectroscopy investigation. Geochimica et Cosmochimica Acta, 95. 119-133 doi:10.1016/j.gca.2012.07.030 | Journal (article/letter/editorial) | | in the saprolite. In the Philippines (ophiolite complex on the Pujada Peninsula), the recent EXAFS study...and Appendix for analytic details. serpentine and talc as well as quartz, together with small amounts of...indicate large amounts of goethite and traces of talc. Samples from this transition laterite still contain...Minerals identified are goethite (gt), hematite (hem), talc (tlc), asbolane and/or lithiophorite (a/l), serpentine...similarities with those of natural Ni-rich phyllosilicates (talc and/or serpentine) and with spectra of the laterite |  | | Journal (article/letter/editorial) | | weathering involved the Oman Mountains region. This weathering produced complex mineral and chemical assemblages...mainly due to the chemical weathering of mafic/ultramafic rocks associated with active Cretaceous to Late...settings developed on Archean to Proterozoic ultramafic rocks, as in Australia, Brazil, Urals, Ukraine...many factors, such as the presence of an exposed ultramafic protolith and tropical to subtropical climates...wt.% in laterites developed on ophiolite mafic/ultramafic rocks (Butt and Cluzel, 2013; Elias, 2006)) and |  | Dublet, Gabrielle, Juillot, Farid, Morin, Guillaume, Fritsch, Emmanuel, Fandeur, Dik, Brown, Gordon E. (2015) Goethite aging explains Ni depletion in upper units of ultramafic lateritic ores from New Caledonia. Geochimica et Cosmochimica Acta, 160. 1-15 doi:10.1016/j.gca.2015.03.015 | Journal (article/letter/editorial) | | phyllosilicates including serpentine and, to a lesser extent, talc and smectite, together with variable amounts of...incised peneplain capped by an iron pan of the Goro region in the Southern Province (Fig. 1). The corresponding...sample. Goethite, hematite, chromite, gibbsite, talc, quartz, asbolane, lithiophorite, chlorite, and...of this article.) Saalfeld and Wedde, 1974), and talc (Mg3Si4O10(OH)2: Gruner, 1934). The asbolane/lithiophorite...because, to our knowledge, the structure of this complex mineral phase is not yet fully determined. Scale |  | | Report (issue) | | .B3 Graph showing dates associated with all the mine sites on the U.S. Environmental Protection Agency’s...production, U.S. apparent consumption, and U.S. mine production of antimony from 1900 to 2012............................F2 Graph showing world cobalt mine and refinery production and apparent consumption.....................F2 Graph showing world cobalt mine production from 1950 to 2011......................F4. Pie chart showing percentage of world cobalt mine production in 2011, by country................. |
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