 | | 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...mineral assemblage includes Mn oxyhydroxides, magnetite, maghemite, ferritchromite, goethite, hematite...associated with gibbsite in the lower breccia and with magnetite and ferritchromite in the ferralite. Although |  | | 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 |  | 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 |  | 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 |  | 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...China 1. Introduction Chemical weathering of ultramafic rocks has produced numerous lateritic profiles...accretionary belts or komatiites and layered ultramafic rocks in stable cratonic blocks [4,5]. In the...laterite profiles record the complex lateritization history of ultramafic rocks [7,21]. (3) Supergene...supergene Ni enrichment remain enigmatic due to the complex parent rock lithologies and local environmental |  | | Journal (article/letter/editorial) | | enrichments of U, K and W over background values. Local magnetite concentration is up to ~35% of whole rock, which...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 |  | | 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...sources for the PGM. These layers consist of magnetite-bearing gabbros that contain PGE mineralization...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, |  | | 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...(Burgath, 1988); serpentinite lateritic coatings in Cameroon (Ndjigui and Bilong, 2010); lateritic soils covering...weathered Yubdo ultramafic intrusion, Ethiopia (Belete et al., 2000, 2002), the Uktus Complex in Central Urals...al. (2013) defined four stratiform layers of magnetite-bearing gabbros with PGE mineralization (up to |  | | Report (issue) | | hematite iron oxide-copper-gold mega-annum magnesium magnetite manganese alabandite Mississippi Valley-type nickel... 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 |  | 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 |  | 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 |  | | 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...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 |  | 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...serpentines, talc and pimelite, goethite (up to 9 wt%), magnetite (2.8–14 wt%) and Mn oxy-hydroxides (0.35–19 wt%)...wt%). The other main Co bearing minerals are magnetite (0.41–1.89 wt%), chlorite (up to 0.45 wt%) and...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 |  | | 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) | | 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 |  | 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...is very rich in goethite, whereas hematite and magnetite are almost absent. Above this layer, the hematite...pedimentation. KEYWORDS: serpentinitic soil, Cameroon, Mössbauer spectroscopy, X-ray diffraction. |  | | Journal (article/letter/editorial) | | manganese oxyhydroxides in laterite developed on ultramafic rocks Carmela Alen J. Tupaz1 Takuya Echigo1 ... which are products of intense weathering of ultramafic rocks such as dunite, harzburgite, and their...formations, which make up the Palawan Ophiolite Complex (Figure 1a) (Yumul et al., 2009). Radiolarian index...Ophiolite Complex (Raschka et al., 1985). The ultramafic rocks of the Beaufort Ultramafic Complex are the...to the southernmost section of the island. The complex is principally composed of harzburgite with cumulate |  | | 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,...Serpentinites also contain minor amounts of chromite, magnetite, brucite, and talc (McGahan et al., 2008, 2009;...high resistance to weathering (e.g. chromite and magnetite) (Hseu and Iizuka, 2013), most minerals of serpentinites...the world’s rice-growing area occurring in this region (Kyuma, 2004). Serpentinitic landscapes are found |  | | Journal (article/letter/editorial) | | weathering involved the Oman Mountains region. This weathering produced complex mineral and chemical assemblages...chlorite and goethite as the main Ni-bearing hosts. Magnetite and chromite are also present as by-product minerals...indicator for their future exploration. Chromite and magnetite grains are present in a wide range of grain sizes...Saqah-4 and Al Russayl profiles and 70 % of the magnetite in Saqah-2 occur as liberated phases (>95 %) compared...(high-grade materials) followed by chromite and magnetite, which are interlocked with other phases to lower |  | | 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...horizon and correspond to a varying mixture of magnetite, serpentine, maghemite and goethite (Villanova-de-Benavent...serpentines of hydrothermal origin and traces of magnetite as in Andréani et al. (2013). According to the |  | | Journal (article/letter/editorial) | | et al. 2004). Most ureilites are unbrecciated ultramafic rocks consisting of olivine and pyroxene, representing...of four “in house” standards (quartz, olivine, magnetite, calcite) were used to determine the instrumental...extraterrestrial granites. It plots in a similar region as the bulk compositions of several glassy inclusions...the terrestrial fractionation line, far from the region of ureilites, and close to the field of H chondrites...Mineralogical characterization of the Nkamouna Co-Mn laterite ore, southeast Cameroon. Minerallium Deposita 48:155–171 |  | Domènech, Cristina, Galí, Salvador, Villanova-de-Benavent, Cristina, Soler, Josep M., Proenza, Joaquín A. (2017) Reactive transport model of the formation of oxide-type Ni-laterite profiles (Punta Gorda, Moa Bay, Cuba) Mineralium Deposita, 52 (7) 993-1010 doi:10.1007/s00126-017-0713-0 | Journal (article/letter/editorial) | | from the chemical and mechanical weathering of ultramafic rocks exposed to the surface under favorable...(a) partially or totally 994 serpentinized ultramafic rock (protolith) characterized by unweathered...interaction of slightly acidic meteoric water with the ultramafic bedrock causes the release of Mg, Si, and Ni...conditions, maghemite can form by oxidation of magnetite (Gehring et al. 2009; Lilova et al. 2012) that...precursor, magnetite, is considered instead (Gehring et al. 2009). Serpentine I and magnetite were formed |  | Zou, Shaohao, Zou, Fenghui, Ning, Juntao, Deng, Teng, Yu, Deshui, Ye, Tingwei, Xu, Deru, Wang, Zhilin (2018) A stand-alone Co mineral deposit in northeastern Hunan Province, South China: Its timing, origin of ore fluids and metal Co, and geodynamic setting. Ore Geology Reviews, 92. 42-60 doi:10.1016/j.oregeorev.2017.11.008 | Journal (article/letter/editorial) | | that Co is 68 derived from sulfides or mafic–ultramafic complexes (Naldrett, 1999; Dzemua and Gleeson... 76 Cu–Ni sulfide deposits related to mafic/ultramafic rocks. In the last two decades, numerous 77...origin of 103 ore fluids as well as the source region(s) of the metal Co. Combined with regional geological...basalts intercalated with meta-volcaniclastics and magnetite 128 quartzites (Jia and Peng, 2005). The Neoarchean...granitiods, the most abundant 139 igneous rocks in the region, were intruded within the uplifts of the Basin-and-Range |
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