 | | Journal (article/letter/editorial) | | paper Pegmatitic Nb-Ta oxide minerals in alluvial placers from Limbach, Bratislava Massif, Western Carpathians...of granitic pegmatite origin was found in alluvial placers near Limbach, the Bratislava granitic massif...[Mn/(Mn + Ta) = 0.40â0.41, Ta/(Ta + Nb) = 0.81] and uraninite + uranmicrolite [Ta/(Ta + Nb) = 0.81â0.94] indicates...geological occurrences (for example in elluvial to alluvial deposits), where information about the parental...scription of Nb-Ta oxide mineralization in alluvial placers near Limbach in the Bratislava Granitic Massif |  | | Journal (article/letter/editorial) | | (the Anyui River, Russia; Razin and Sidorenko, 1989), (2) hunchunite Au2Pb (the Hunchun River, China; Wu...of these compounds reported predominantly from placers (Murzin et al., 1996; Khazov et al., 2010; Sandimirova...Au-Pb compounds are referred from bedrocks, not placers (Nekrasov et al., 1988; Alexandrov and Barannikov...placer deposit in the upper reaches of the Inagli River is located in the central part of the Aldan Shield...placer deposit is hosted by modern alluvial sediments of the Inagli River that drains the area covered mainly |  | | Journal (volume) | | IATAN Heavy metals in Veredaâs soil of the Formoso River basin, Buritizeiro, Minas Gerais, Brazil ......... Elena NICA Preliminary data of heavy mineral placers deposits from Petite Cote, Senegal ..............New opinion on the origin of the gold from alluvial placers of Romania .................................spectrometer calibration was performed using data for river sediments as reference materials. The statistical... p. 25-28 ASSESSMENT OF METAL CONTAMINATION OF RIVER SEDIMENTS IN CONSERVATION AREAS: CASE STUDY OF CAPARAĂ |  | | Journal (article/letter/editorial) | | Placer Accumulations in Coarse-Grained Alluvial Braided River Systems J. P. BURTON AND PHILIP FRALICKâ ...Depositional paleoplacer accumulations in coarse alluvial braided river systems form by the concentration of heavy...modern gravel bar systems in the North Saskatchewan River, Alberta, and in the Jackpine, Agawa, and Mississagi...concentration: erosion and deposition. Erosional placers are produced by the preferential removal, during...the light mineral fraction, whereas depositional placers are formed by the preferential deposition of heavy |  | | Journal (article/letter/editorial) | | Surprisingly, given the economic importance of placers, the theoretical framework relating to the hydrodynamics...and gold placers are considered. D 2005 Elsevier B.V. All rights reserved. Keywords: Placers; Heavy minerals;...systems is of economic importance, as mineral placers such as gold and diamonds are often found associated...Minter, 1980; Frimmel and Minter, 2002a). However, placers are often relatively small, diffuse or associated...concentration processes is essential to locate placers and to evaluate the total regional resource. Surprisingly |  | Kislov, Evgeniy V., Aseeva, Anna V., Vanteev, Vladislav V., Sinyov, Anton Yurievich, Eliseeva, Olga A. (2022) Naryn-Gol Creek Sapphire Placer Deposit, Buryatia, Russia. Minerals, 12 (5) 509 doi:10.3390/min12050509 | Journal (article/letter/editorial) | | pyrope and chrysolite in alluvialâdeluvial, alluvialâproluvial, and alluvial deposits on the slopes of...magmatic deposits. Sapphires are extracted from placers associated with intraplate alkali basalts in Australia...Naryn-Gol Creek at the left tributary of the Darhintuy River in the southern part of the Dzhida volcanic field...Pleistocene alluvial deposits of the I and II terrace above the floodplain and Holocene alluvial, eluvialâdiluvial...junction of the Naryn-Gol Creek and the Darhintuy River (Mouth Trench, Figure 3) and further upstream in |  | | Book | | enlivened discussions of their origin, e.g., Blind River, \i\litwatersrand, and Colorado Plateau. The writer...... ... .... . .... ..... . . ...... . Zoned Uraninite Pegmatites ...................................... . . . . . . . . . . . . . . Basin and Range Province . . . . . . . . . . . . . . . . . . . . . . ...... . .... .. .. ....... .. . . . Consolidated Placers ............. ... ................... .... .. ... . Zr-Fe 3.......... . 5. Anions Examples Uraninite Pyrochlorc-microlite, apatite, zirkelite, crandalJite |  | | Book (edition) | | encompassed here as well. Right: Conglomerate of uraninite (grey rounded grains) in a massive matrix of pyrobitumen...pyrobitumen (almost the same colour as uraninite), rounded pyrite (creme) with a thin overgrowth of secondary... Loveringite occasion- yes ally dark brown Uraninite Hetaerolite Pyrobitumen white to brownish depends...internal reflections); MadenkĂśy Mine, Ăayeli, Rize Province, Black Sea Region, Turkey (sample: Halbach); XPL...grey; arg); Monte Narba Mine, San Vito, Cagliari Province, Sardinia, Italy; PPL B Same sample as above: |  | | Book | | CHAPTER 15: GOLD DEPOSITS-PLACERS 455 Eluvial Placers / 456 Alluvial Placers / 462 15-1 TYRRELL, J. B...Likewise, the origin of the gold dust and nuggets in placers have from time to time had advocates of a purely...India, China, Japan, and the U.S.S.R. Ancient placers have yielded gold from the rivers Tagus, Guadalquivir...during the Middle Ages. Compared with the gold placers and mines of the Old World, those in parts of the...the exhaustion or near-exhaustion of many of the placers, attention turned to bedrock deposits during the |  | Seifert, Wolfgang, FĂśrster, Hans-JĂźrgen, Rhede, Dieter, Tietz, Olaf, Ulrych, JaromĂr (2012) Mineral inclusions in placer zircon from the OhĹe (Eger) Graben: new data on âstrontiopyrochloreâ. Mineralogy and Petrology, 106 (1) 39-53 doi:10.1007/s00710-012-0221-y | Journal (article/letter/editorial) | | inclusion inventory of 80 zircon megacrysts from alluvial placers of the Cenozoic alkali basalt area of northern...inventory of mineral inclusions occur in many alluvial placers of the Cenozoic alkali basalt area of northern...1999; Seifert 2006, and references therein). This alluvial mineral assemblage is typically found in continental...HIB are probably phonolite-derived heavy-mineral placers. Methods All analytical work was done at the Deutsches...samples thought to represent phonolite-derived placers (KFL, HIB). The three zircon megacrysts (crystal |  | | Journal (article/letter/editorial) | | hydrothermal quartz veins. Many deposits in the province occur in siliciclastic metasedimentary, or metabasaltic...platinum) province; and the early Neoproterozoic (1 Ga) Kibara rare metal and gold province that is the...application of modern concepts and technologies, this province is drastically underexplored. Keywords: Gold,...felsic intrusions. Geographically, this giant metal province comprises Kivu and Maniema, as well as major portions...Cahen et al., 1984) and as the Kibara Metallogenic Province (Pohl, 1987, 1994), the proper noun being derived |  | | Journal (article/letter/editorial) | | deposition. At the foot of the sandstone bluff is an alluvial deposit from which came the earlier production...Quartz of good quality is found in pegmatities and alluvial deposits derived from them in the states of Minas...the region. Most of the quartz has come from alluvial placers in the stream valleys which also yield beryl...but steady supply of good quartz has come from alluvial deposits in the municipalities of Sta. Leopoldina...and Sta. Teresa, Espirito Santo. Part of this alluvial quartz appears to be of pegmatitic origin, for |  | Giuliani, Gaston, Fallick, Anthony, Rakotondrazafy, Michel, Ohnenstetter, Daniel, Andriamamonjy, Alfred, Ralantoarison, ThĂŠogène, Rakotosamizanany, Saholy, Razanatseheno, Marie, Offant, Yohann, Garnier, Virginie, Dunaigre, Christian, Schwarz, Dietmar, Mercier, Alain, Ratrimo, Voahangy, Ralison, Bruno (2007) Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin. Mineralium Deposita, 42 (3) 251-270 doi:10.1007/s00126-006-0105-3 | Journal (article/letter/editorial) | | sakenite, and corundumite. Secondary deposits (placers) are the most important economically and are contained...â0.3 and 16.5â°. The ruby and sapphire found in placers linked to alkali basalt environments in the northern...δ18O values between 3.5 and 6.9â°. Ruby from the placers of Vatomandry and Andilamena has δ18O values of...9â°, and between 0.5 and 4.0â°, respectively. The placers of the Ilakaka area are characterized by a huge...sapphire and ruby crystals mingled in the same alluvial basin. A comparison with the oxygen isotope data |  | | Report (issue) | | HERZEGOVINA BOTSWANA BRAZIL BRUNEI DARUSSALAM BULGARIA BURKINA FASO BURUNDI CAMBODIA CAMEROON CANADA....................................... 9 4.1.4. Placers .................................................sodium metasomatites/albitites migmatites coastal placers Syenites alkaline volcanics veins associated...charnockite fluvial placers Alkaline rocks diatremes thoriferous pyroxenite residual placers Contact metamorphic...metamorphic paleo-placers Igneous Syngenetic Intrusive effusive Carbonatites Peralkaline rocks Granitic |  | | Journal (article/letter/editorial) | | Characteristics of Gold Particles from Recent River Deposits and the Fossil Placers of the Witwatersrand D. K. Hallbauer...over which they have been transported in recent alluvial placer deposits, such as the rivers of the Barberton...Barberton Mountain Land, South Africa and the river Rhine in Germany. It was possible to show that most...and by comparing them with particles from recent alluvial gold deposits it was possible to estimate the...from i0 krn to 30 kin. Gold particles in recent placers show a characteristic increase in fineness with |  | | Book | | geological settings, that include inland stream placers, carbonatites, alkaline to sub-alkaline felsic...resources in India which include beach placers, inland stream placers, carbonatites, peralkaline-alkaline...potential as a resource for REE. Except for Beach Placers, we have only preliminary knowledge of the other...million tonnes (Mt) is contained mostly in beach placers of India. Some of the deposits in Odisha (Chatrapur)...heavy REE (HREE) resources occurring as inland placers along the courses of several streams draining through |  | | Book | | the district of Beni Bu Ifrur, Kelaia, in the province of Nador, some 20 km south-southwest of the port...Mesozoic (tin^ etc.)j Late Tertiary to Recent (placers) Tin^ Columbiwn (Tantalum)3 Rare Earths^ Uranium-Thorium...Uranium-Thorium Hypothermal-1 (primary)^ Placers-IB and IC (secondary) Black, R., and others, 1 9 5 7 ..., Ring complexes in the Younger granite province of northern Nigeria (abs.): Geol. Soc. London Quart...C , 1 9 2 3 , The northern tinfields of Bauchi Province: Geol. Surv. Nigeria Bull., no. 4 , 67 p. Grant |  | | Journal (article/letter/editorial) | | detrital Witwatersrand gold with gold from modern alluvial placers. The second gold type derived from small-...Witwatersrand gold particleswith gold particlesfrom modern alluvial placer deposits, Hallbauer and Utter (1977) were...According to these authors gold particles from recent alluvial placer deposits of the deficiencyin free oxygen...been reported (Zemczuzny,1926; Ram- succession of alluvial fans on a southeasterlydipping dohr, 1975). Most...andesitic Ventersdorp Lava. cles from modern alluvial placers show an increase Most of the gold is recoveredfrom |  | | Book | | affects its present characteristics as a minera1 province, because of the exposure of the various depth...same manner in which detrital heavy minerals in placers are enclosed in the sediments with which they formed...about 120 Tt Pb, 476 t Au (much of it from gulch placers) and 2.5 Tt Ag, from about 15 ore fields or districts...and contains the principal Soviet porphyry Cu-Mo province estimated to represent some 15 Mt Cu and 200 Tt...and Au mineralization this is a distinct Sn(W) province. 1026 Fig. 28-9. Kounrad "porphyry" Cu-Mo deposit |  | | Journal (article/letter/editorial) | | Tyuyamunite Ulexite Ullmannite Ulvite Umangite Uraninite Uranophane Uranospinite Uranothorite Uvarovite...used to recover lead) nor as fossil fuels (see uraninite considered as an energy source in power plants)...Chromite is a heavy mineral common to many beach and alluvialâďŹuvial placer deposits (Hokkaido, Japan, Great...ChĂŠtelat (1947). of the garnierites of the Uralian province are of hypogene rather supergene origin (chrysotile...and CuâNi deposits in ultramaďŹc rocks, and in placers â Rustenburgite Pt2.25Pd0.75Sn â Atokite Pd2.25Pt0 | | | Journal (article/letter/editorial) | | Tyuyamunite Ulexite Ullmannite Ulvite Umangite Uraninite Uranophane Uranospinite Uranothorite Uvarovite...used to recover lead) nor as fossil fuels (see uraninite considered as an energy source in power plants)...Chromite is a heavy mineral common to many beach and alluvialâďŹuvial placer deposits (Hokkaido, Japan, Great...ChĂŠtelat (1947). of the garnierites of the Uralian province are of hypogene rather supergene origin (chrysotile...and CuâNi deposits in ultramaďŹc rocks, and in placers â Rustenburgite Pt2.25Pd0.75Sn â Atokite Pd2.25Pt0 |  | | Journal (article/letter/editorial) | | greisen deposits, copper-porphyry ore beds, alluvial placers, copper-bearing sandstones, and ferruginous...USA (California, Oregon) Cuba J Greece, Albania, Bulgaria USA C-P1 Japan Urals Pz 1 Norway Pzi Canada 1950l00...years). These determinations were made using uraninite and lepidolite, related to the granite of pegmatites;...metallogenic sketch of the Ukrainian iron-ore province by Belevtsev et al. (1962) relates the formation...A METAL LOGE NIC OUTLINE OF THE UKRAINIAN IRON PROVINCE. In Zakonomer. Razmeshch. Polezn. Iskop IV [DISTRIBUTION |  | | Book (edition) | | ZhiJandy, Kazakhstan, G Galena, 45 mm, Madan, Bulgaria, G SphaJerite. xx 12 mm, Morococha, Peru, H Gypsum...sedimentary and metamorphic rocks and in residual and alluvial deposits. Special attention was paid to localities...expressed in abbreviations: Rep. (republic), prov. (province), co. (county), munic. (municipio), pref. (prefecture)...Mt. (mount or mountain), Mts. (mountains), R. (river), Is. (island), Vole. (volcano), Penin. (peninsula)...the revolution in 1997. Its mineral rich Katanga province was renamed Shaba by Mobutu, and is now the Katanga |  | | Book | | affects its present characteristics as a mineral province, because of the exposure of the various depth...same manner in which detrital heavy minerals in placers are enclosed in the sediments with which they formed...about 120 Tt Pb, 476 t Au (much of it from gulch placers) and 2.5 Tt Ag, from about 15 ore fields or districts...and contains the principal Soviet porphyry Cu-Mo province estimated to represent some 15 Mt Cu and 200 Tt...and Au mineralization this is a distinct Sn(W) province. 1026 Fig. 28-9. Kounrad "porphyry" Cu-Mo deposit |  | | Report (volume) | | Monazite Placers In the Southeastern Atlantic States By jOHN B. IvfERTIE, JR. GEOLOGICAL SURVEY...A4ountain streams need exploration) but the main placers are likely to be in the Coastal Plain UNITED ...Publication Data Mertie, John Beaver, 1888Monazite placers in the southeastern Atlantic States. (Geological..._______ _____ _ Alluvial monazite ___ _____ __ _ _____ _______ _______ ____ _ _ Piedmont province _______ _..._____ _ ___ ___ _______ ____ _ _ Coastal Plain province _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
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