 | | 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 |  | 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...accessory apatite, spinel, sericite, pyrite, chalcopyrite and non-identified opaque minerals. The presence...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: |  | | Report (issue) | | the Congo chalcopyrite (appears in this form on page 22 only; elsewhere, cpy) chalcopyrite carrollite... 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 |  | | 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,...the Freetown intrusion contain disseminated chalcopyrite, bornite, chalcocite, pentlandite, and pyrrhotite |  | | 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) | | 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...Magnetite ‘Limonite’ Pyrite Pyrrhotite Pentlandite Chalcopyrite D01 D13 D14 D16 D17 D18 D21 D35 D01 D13 D14 |  | | 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 |  | 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) | | stages marked by quartz + pyrite + muscovite ± chalcopyrite of the early-stage mineralization 26 (E-stage)...strike-slip shearing. The δ34SCDT values of pyrite and chalcopyrite ranging from -1.5 32 to -15.9‰ with a majority...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 |  | | 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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