 | | Journal (article/letter/editorial) | | Similar supergene occurrences occur at Lueshe and Bingo (D.R. Congo), Mabounié (Gabon), Sukulu (Uganda)...date, all major operating and former (Oka, Fen, Lueshe) Nb mines have been developed in primary carbonatites...only operating Nb mine in under-saturated peralkaline syenites is the Karnasurt mine (Kremenetsky et al... wodginite, and columbite–tantalite group minerals. The LCT-granites, and columbite–tantalite placers...perovskite group minerals, or the wodginite and columbite–tantalite groups (typical of LCT-granites). There |  | Melcher, Frank, Graupner, Torsten, Gäbler, Hans-Eike, Sitnikova, Maria, Henjes-Kunst, Friedhelm, Oberthür, Thomas, Gerdes, Axel, Dewaele, Stijn (2015) Tantalum–(niobium–tin) mineralisation in African pegmatites and rare metal granites: Constraints from Ta–Nb oxide mineralogy, geochemistry and U–Pb geochronology. Ore Geology Reviews, 64. 667-719 doi:10.1016/j.oregeorev.2013.09.003 | Journal (article/letter/editorial) | | Ma) 4.1.1. Man Shield (Sierra Leone) NU 4.1.2. Congo Craton (DRC) 4.1.3. Zimbabwe Craton (Zimbabwe) ...Côte d'Ivoire) 4.2.2. North-eastern DRC (Ubendian, Orientale and northern North Kivu) D 4.3. Neoproterozoic...1.2. Mineralogy NU 5. Mineral chemistry of columbite-tantalite, tapiolite, wodginite and ixiolite in...provinces MA 5.1. Archean 5.1.1. Man Shield 5.1.2. Congo Craton 5.2. Paleoproterozoic CE P 5.2.1. Birimian...Kaapvaal Craton D 5.1.3. Zimbabwe Craton 5.2.2. North-eastern DRC 5.3. Neoproterozoic 5.3.1. Kibara Belt |  | Benaouda, Rachid, Kraemer, Dennis, Sitnikova, Maria, Goldmann, Simon, Freitag, Ralf, Bouali, Abdelhafid, Mouttaqi, Abdellah, El Haloui, Rachid, Essaadaoui, Mustapha, Bau, Michael (2020) Thorium-poor monazite and columbite-(Fe) mineralization in the Gleibat Lafhouda carbonatite and its associated iron-oxide-apatite deposit of the Ouled Dlim Massif, South Morocco. Gondwana Research, 77. 19-39 doi:10.1016/j.gr.2019.06.011 | Journal (article/letter/editorial) | | Journal Pre-proof Thorium-poor monazite and columbite-(Fe) mineralization in the Gleibat Lafhouda carbonatite...Sitnikova, et al., Thoriumpoor monazite and columbite-(Fe) mineralization in the Gleibat Lafhouda carbonatite... Journal Pre-proof Thorium-poor monazite and columbite-(Fe) mineralization in the Gleibat Lafhouda carbonatite...mineralization and is represented by monazite-(Ce) and columbite-(Fe) as major ore re minerals. The IOA mineralization...commonly represented by anhedral minerals of columbite-(Fe) which occur closely associated with magnetite-hematite |  | | Report (issue) | | - - - - - - - - - - - - - - - - - - - Additional ~fe~nces on niobium and tantalum resources----------...~port- - - - -- - - - - - - - - Graph showing world mine production of niobium concentrate, for selected...is used mainly in electronics. Minerals in the columbite-tantalite series are principal ore minerals of...is further strengthened by potential byproduct columbite from tin mining. Present economically exploitable...and tantalum in the form of minerals such as columbite, tantalite, or pyrochlore. A special difficulty |  | | Journal (article/letter/editorial) | | vermiculite, Cu, Ti, fluorite, Th, U, natural zirconia, and Fe. Nine per cent of carbonatites and alkaline-carbonatite...carbonatite-related REE deposits, such as at Bayan Obo Fe-REE-Nb deposit, Inner Mongolia (Smith et al. 2015;...15 wt.% Ca, and less than 1 wt.% combined Mg and Fe (Keller and Krafft 1990; Keller and Zaitsev 2012)...consensus regarding the origin of magnesium- and Fe-rich carbonatites. They are believed to either evolve...(dolomite carbonatite) pulses, which in turn predate more Fe±Mn-rich (ferrocarbonatite) pulses as illustrated |  | Škoda, R., Novák, M., Cícha, J. (2011) Uranium-niobium-rich alteration products after “písekite”, an intimate mixture of Y,REE,Nb,Ta,Ti-oxide minerals from the Obrázek I pegmatite, Písek, Czech Republic. Journal of GEOsciences, 56 (3) 317-325 | Journal (article/letter/editorial) | | dominated by Fe-rich smectite. “Písekite” aggregate is intensively replaced by U, Nb, Ti, Fe, As, P-rich...> Ti > Fe > U > As) from the first assemblage, as well as phases B (U ~ Nb >Ti > As > P > Fe) and C (U...(U > Nb > As > Fe > Ti) from the second assemblage. Associated pharmacosiderite and kahlerite/metakahlerite...kahlerite/metakahlerite as well as Fe-rich smectite indicate a low temperature of the alteration processes (less than...host pegmatite yielded As with Fe. The textural features show that the Fe-rich smectite replacement by |  | Guowu, Li, Guangming, Yang, Fude, Lu, Ming, Xiong, Xiangkun, Ge, Baoming, Pan, de Fourestier, Jeffrey (2016) Fluorcalciopyrochlore, A New Mineral Species From Bayan Obo, Inner Mongolia, P.R. China. The Canadian Mineralogist, 54 (5) 1285-1291 doi:10.3749/canmin.1500042 | Journal (article/letter/editorial) | | species (IMA2013-055) occurring in the Bayan Obo Fe-Nb-REE deposit, Inner Mongolia, People’s Republic...bastnäsite-(Ce), zircon, magnetite, pyrite, fersmite, columbite-(Fe), monazite-(Ce), rutile, and others. Crystals...sequence deposited in easttrending grabens along the north edge of the Archean crystalline Sino-Korean craton...H8) (Wang Xibin 2002). Enrichment of REE, Nb, and Fe constituent minerals occurs in dolomite, alteration...deposit, but is a complex deposit which includes REE-Nb-Fe carbonate magmatic deposits, replacement alteration |  | | Journal (article/letter/editorial) | | Tapira and Salitre, together with the decommissioned mine at Catalão-I (Mitchell, 2015). One objective of...northwest of the town of Marathon, approximately 26 km north of the shore of Lake Superior at 49o02' N; 86o43'W...(Sr, Ti); ThNb4O12 (Th, Nb); Mn-hortonolite (Mn, Fe, Mg, Si); jadeite (Na,Al), individual REE- orthophosphate...2 wt.%) as there are no peak overlaps by O Kα or Fe Kα lines with the F Kα line. Trace element data for...boundaries are highlighted by thin films of brown Fe-oxides/hydroxides or extremely fine grained amorphous |  | Benaouda, Rachid, Kraemer, Dennis, Sitnikova, Maria, Goldmann, Simon, Schwarz-Schampera, Ulrich, Errami, Abdellatif, Mouttaqi, Abdellah, Bau, Michael (2020) Discovery of high-grade REE-Nb-Fe mineralization associated with calciocarbonatite in south Morocco. Ore Geology Reviews, 124. 103631pp. doi:10.1016/j.oregeorev.2020.103631 | Journal (article/letter/editorial) | | Journal Pre-proofs Discovery of high-grade REE-Nb-Fe mineralization associated with calciocarbonatite...Mouttaqi, M. Bau, Discovery of high-grade REE-Nb-Fe mineralization associated with calciocarbonatite...Elsevier B.V. 1 Discovery of high-grade REE-Nb-Fe mineralization associated 2 with calcio-carbonatite...ring structure that mainly 18 consists of massive Fe-oxide mineralization and silica breccia. The carbonatite...usually 21 associated with apatite, quartz and Fe-oxides, or trapped in calcite voids, 22 suggesting |  | | Book (edition) | | co-author, teacher, mentor, colleague and friend, Dr. Joseph A. Mandarino. -Malcolm E. Back Fleischer's...they are: Dr. Peter Bayliss, Dr. Ernst A.J. Burke, Dr. Anton and hakhmouradian,Robert Gault, Dr. Julian...Låszl6 Horvåth, Dr. Uwe Kolitsch, Locock,Gaspare Malet.to,Dr. Roger Mitchell, Renato Pagano. Dr. Ole Petersen...Robert Ramik,Andy Roberts, hallit, Dr. Chris Stanley,Tony Steede and Dr. ThomasWitzke. upport and encouragementof...Platinum Potassium Praseodymium Radium Radon H In I Ir Fe Kr La Pb Li Lu Mg Mn Hg Mo Nd Ne Ni Nb N Os 0 Pd |  | | Journal (article/letter/editorial) | | of the main Nb–Ta oxide minerals (including columbite-(Fe), fersmite, fergusonite-(Y), and especially...different stages were identified. The euhedral columbite-(Fe), fersmite, and pyrochlores I and II minerals...dike; Panxi region; pyrochlore group minerals; columbite subgroup minerals with regard to jurisdictional...studies [22–30]. The veinlets of tantalite-(Fe) in the (Fe) in thepegmatite Nanping pegmatite inChina...compositions of main Nb–Ta oxide minerals (including columbite-(Fe), fersmite, fergusonite-(Y), and and pythe main |  | Harlaux, Matthieu, Marignac, Christian, Cuney, Michel, Mercadier, Julien, Magott, Rémi, Mouthier, Bernard (2015) Nb-Ti-Y-HREE-W-U Oxide Minerals With Uncommon Compositions Associated With the Tungsten Mineralization In the Puy-Les-Vignes Deposit (Massif Central, France): Evidence For Rare-Metal Mobilization By Late Hydrothermal Fluids With A Peralkaline Signature. The Canadian Mineralogist, 53 (4) 653-672 doi:10.3749/canmin.1400096 | Journal (article/letter/editorial) | | paragenesis composed of zircon, xenotime, monazite, Nb-Fe-W rutile, and Nb-Ti-YHREE-W-U oxide minerals (hereafter...group of anatase-columbite solid solution and a second group of euxenite-(Y)-columbite solid solution....hydrothermal fluids: a first fluid (L1) enriched in Ti4Nb, Fe, and W, with the same geochemical signature as the...mineralization, and a second fluid (L2) enriched in Nb4Ti, Fe, Y, REE, and W, with a geochemical signature clearly...(HFSE), of which the principals belong to the columbite–tantalite, euxenite, aeschynite, pyrochlore, samarskite |  | Starikova, Anastasia E., Bazarova, Ekaterina P., Savel’eva, Valentina B., Sklyarov, Eugene V., Khromova, Elena A., Kanakin, Sergei V. (2019) Pyrochlore-Group Minerals in the Granite-Hosted Katugin Rare-Metal Deposit, Transbaikalia, Russia. Minerals, 9 (8) 490 doi:10.3390/min9080490 | Journal (article/letter/editorial) | | stage when Fe from the melt became bound, which hindered the crystallization of columbite. Secondary-I...ranges of elements and contains minor K, Ba, Pb, Fe, and significant Si concentrations but also low Na...Ba-fluoraluminates). Ta-Nb-REE phases are mainly pyrochlore, columbite-(Fe), fluorides (fluocerite-(Ce), gagarinite-(Y)...diopside (Ca); F-phlogopite (F, K, and Mg); garnet (Fe, Mn); (LiNbO3 (Nb); rutile (Ti); Ta2 O5 (Ta); zircon...Ca, 0.09 for F, 0.02 for K, 0.04 for Mg, 0.01 for Fe, 0.02 for Mn, 0.08 for Nb, 0.04 for Ti, 0.16 for |  | | Journal (article/letter/editorial) | | due in part to historic influx of ‘conflict’ columbite-tantalite concentrate, or “Coltan,” that caused...% from tin slag refining and 10 % from secondary mine concentrates. Due to rapid industrialisation and...Canada account for about 92 and 7 % of Nb world mine production, respectively. Since the bulk of the...significant deposits of Ta and Nb contain pyrochlore, columbite-tantalite, fersmite, loparite and strüverite....Rare-elements . Strategic metals . Pyrochlore . Columbite . Tantalite Introduction Tantalum (Ta) and niobium |  | RYU, Toru, KIMATA, Mitsuyoshi, NISHIDA, Norimasa, KYONO, Atsushi, SHIMIZU, Masahiro (2005) Chemical composition of ferrocolumbites from the Ishikawa-yama granitic pegmatites, Fukushima, Japan. Japanese Magazine of Mineralogical and Petrological Sciences, 34 (5) 242-251 doi:10.2465/gkk.34.242 | Journal (article/letter/editorial) | | and Nb; (3) a trend with patchy zoning related to Fe and Mn. Oscillatory zoning of ferrocolumbite is intimately...コルンブ石の化学組成は (Fe,Mn) (Nb,Ta)2O6 で，Nb に富む コルンブ石に対して，Ta に富むものはタンタル石に分類 される。コルンブ石―タンタル石系列では Fe と Mn, Nb と Ta...射電子像については，照射電流 20 nA，プローブ径 1 m で，Nb−L，Ta−M，Ti−K，Mn−K，Fe−K 像 に つ いては，照射電流 100 nA，プローブ径 1 m で，定性分析 では，照射電流...(Ta L) , TiO2 (Ti K) , MnFe2O4 (Mn K) , Fe2O3 (Fe K) を使用した。ま た，オフラインで ZAF 補正を行った。 244 龍 徹 ・木股...granitic pegmatites. (a) BSE image, (b) Ta, (c) Nb, (d) Fe, (e) Mn and (f) Ti. Numbers in (a) correspond to |  | Doroshkevich, Anna G., Veksler, Ilya V., Klemd, Reiner, Khromova, Elena A., Izbrodin, Ivan A. (2017) Trace-element composition of minerals and rocks in the Belaya Zima carbonatite complex (Russia): Implications for the mechanisms of magma evolution and carbonatite formation. Lithos, 284. 91-108 doi:10.1016/j.lithos.2017.04.003 | Journal (article/letter/editorial) | | 1), which is located at the intersection of the north-west striking Paleoproterozoic Urik-Iya graben and...exposure of the complex is slightly elongated in the north-west direction of the controlling fault system....ankerite carbonatite comprises lens-shaped and north-south oriented vein-like MA bodies. The nepheline...of 10 nA and an acceleration voltage of 15 kV; for Fe-Ti oxides 20 nA and 15 kV, for REE minerals, pyrochlore...ilmenite. In some cases, it is replaced by columbite-(Fe) along the rims. Calcite is speckled with dolomite |  | Zhongxin, Yuan, Ge, Bai, Chenyu, Wu, Zhongqin, Zhang, Xianjiang, Ye (1992) Geological features and genesis of the Bayan Obo REE ore deposit, Inner Mongolia, China. Applied Geochemistry, 7 (5) 429-442 doi:10.1016/0883-2927(92)90004-m | Journal (article/letter/editorial) | | deposit is located on the northern margin of the North China platform. When the Proterozoic Bayan Obo Group...massive REE-Fe ore are -2.99 to +3.55%0, a n d ~18Omagnetite values of riebeckite REE-Fe ore are +0.76...reserves of the world. The deposit is also a big Fe concentrate with ore reserves of - 6 0 0 Mt. Beside...in China: (1) The ore-forming materials, such as Fe, Nb and the R E E mainly came from a terrigenous...dolomite marble intercalated with feldspar rock, the north of the deposit are interpreted as a swarm of biotite |  | | Book | | (calciocarbonatites), Mg-rich (dolomite carbonatites), Fe-rich (ankerite carbonatites) and Na-rich (natrocarbonatites)...View of the Oldoinyo Lengai stratovolcano from the north. The volcano is rising 2000 m above its surroundings...Oldoinyo Lengai, Tanzania. Lithos 91: 173–190 Sherrod DR, Magigita MM, Kwelwa S (2013) Geologic map of Oldonyo.... . . . . . . . . . . . . . . . . Route 1: The North Coast . . . . . . . . . . . . . . . . . . . . ..... . . . . . . . . . . . . . . 4.2 Road-Cutting North of Hartung (close to the Coastal Road) . . . . |  | | Report (issue) | | murmanite. The recovery of tantalum is chiefly from columbite-tantalite, microlite, or euxenite ores. Future...of some oxide minerals such as perovskite and columbite are formed basically from linked octahedrally...irinite. Biotite. Rutile, tapiolite. (Nb, (Nb, Ta)+5+(Fe, Al)«<-» 2(Nb, T Zr (Nb, 2(Nb, 2(Nb, (Nb," (Nb, ...Wolframite. (Nb, Sn 2(Nb, Cassiterite. AI, Si, Fe (Nb, Ta)«+2(Mn, (Nb, T Iron oxides. Pyroxenes,...are known to be mixtures of these minerals and columbite-tantalite (Grigor'ev and Dolomanova, 1951). Kuz'menko |  | | Journal (article/letter/editorial) | | deposits by Tissot and Welte (1978), Hunt (1979), North (1985), Selley (1997) and Gluyas and Swarbrick (2004)...information gathered through times on Pb–Zn- and Fe deposits in several monographs in the “Geologische...NaFeSi2O6 (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Fe7.6Ni0.4O6.4(OH)9.7Cl1.3 MnS NaAlSi3O8 BeAl2O4 (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH)...XY2Z5(Si, Al, Ti)8O22(OH, F)2 X = K, Na, Y = Fe Ca, Mg, Mn, Zn, Z = Fe, Mn, Al, Ti NaAl(Si2O6)·(H2O) TiO2 SrCe(CO3)2(OH)·(H2O)...SrCe(CO3)2(OH)·(H2O) Al2SiO5 PbSO4 CaSO4 Cu1.75S Ca(Mg, Fe)(CO3)2 Ni3 (AsO4)2.8H2O CaAl2Si2O8 (Na,K)AlSi3O8 | | | Journal (article/letter/editorial) | | deposits by Tissot and Welte (1978), Hunt (1979), North (1985), Selley (1997) and Gluyas and Swarbrick (2004)...information gathered through times on Pb–Zn- and Fe deposits in several monographs in the “Geologische...NaFeSi2O6 (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Fe7.6Ni0.4O6.4(OH)9.7Cl1.3 MnS NaAlSi3O8 BeAl2O4 (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH)...XY2Z5(Si, Al, Ti)8O22(OH, F)2 X = K, Na, Y = Fe Ca, Mg, Mn, Zn, Z = Fe, Mn, Al, Ti NaAl(Si2O6)·(H2O) TiO2 SrCe(CO3)2(OH)·(H2O)...SrCe(CO3)2(OH)·(H2O) Al2SiO5 PbSO4 CaSO4 Cu1.75S Ca(Mg, Fe)(CO3)2 Ni3 (AsO4)2.8H2O CaAl2Si2O8 (Na,K)AlSi3O8 |  | | Journal (article/letter/editorial) | | The major rock-forming minerals are diverse Ca-Mg-Fe carbonates, fluorite, and quartz. The carbonates...Deposit, REE-deposit, monazite, xenotime, fluorite, Mg-Fe carbonates, apatite, magbasite, bafertisite, quartz...at longitude 68o24ʹ0ʺ west and latitude 56o57ʹ0ʺ north (Fig.1). The complex was discovered in 1981 during...600 metres. Mineralization remains open to the north, south, at depth, and is not fully constrained to...energy dispersive X-ray spectrometry using a Hitachi FE-SU70 scanning electron microscope equipped with the |  | | Book | | abundance in the Keweenaw area of north Michigan; at the Copper Queen mine, Bisbee, Arizona and at Georgetown...Canada deposits occur at the Klondike, Yukon Territory, in Nova Scotia and Ontario. Treatment. Gold is...areas including Kimberley, Pretoria (the Premier mine is in this area), and Jagersfontein in the Orange...Localities. Lead is found in Sweden at the Harstig mine, Pajsberg; from the gold placers of the Ural Mountains...several localities in Chile, and from the Mohawk mine, Keweenaw County, Michigan; also from Lake Superior |  | | Book | | unassuming hill with a dusty stone quarry on its north flank, which some enthusiastic collectors refer...team. First and foremost, our special thanks go to Dr. Robert F. Martin, editor of the Special Publication... especially the president, Dr. Paula Piilonen, and the Past-President, Dr. Andrew McDonald, for their...have been supportive and helpful on many fronts. Dr. Joel Grice has been generous with his advice and...and engaged in helpful discussions over many years. Dr. Paula Piilonen provided insight on MSH petrology |  | | Report (issue) | | holdings. Prior to 1978, the development of complete mine property cost evaluations was impeded by still evolving...tool. Systems design work also continued on the mine simulation (MINSIM) program, an economic evaluation...reserves. These include implications that because a mine is operating it is profitable, that reported reserves...prices, which are variable over the life of the mine. Economic evaluation is complicated by the presence...and economic variables on viability of individual mine properties (17-18). Nonproducing deposits Producing |
|
