 | | Journal (article/letter/editorial) | | minerals in alluvial placers from Limbach, Bratislava Massif, Western Carpathians, Slovakia: compositional... Comenius University, Mlynská dolina, 842 15 Bratislava, Slovak Republic; puher@fns.uniba.sk 2 Eastern... Comenius University, Mlynská dolina, 842 15 Bratislava, Slovak Republic * Corresponding author 1 Niobium-tantalum...pegmatite origin was found in alluvial placers near Limbach, the Bratislava granitic massif, Malé Karpaty...Mountains, Central Western Carpathians, southwest Slovakia. The most widespread mineral is ferrocolumbite |  | Chudík, Peter, Uher, Pavel, Gadas, Petr, Škoda, Radek, Pršek, Jaroslav (2011) Niobium-tantalum oxide minerals in the Jezuitské Lesy granitic pegmatite, Bratislava Massif, Slovakia: Ta to Nb and Fe to Mn evolutionary trends in a narrow Be,Cs-rich and Li,B-poor dike. Mineralogy and Petrology, 102 (1) 15-27 doi:10.1007/s00710-011-0163-9 | Journal (article/letter/editorial) | | the Jezuitské Lesy granitic pegmatite, Bratislava Massif, Slovakia: Ta to Nb and Fe to Mn evolutionary trends...dike intruding biotite granodiorites near Bratislava, SW Slovakia. The dike shows enrichment in beryl (locally...Comenius University, Mlynská dolina, 842 15 Bratislava, Slovakia e-mail: chudik@fns.uniba.sk P. Uher Department...Comenius University, Mlynská dolina, 842 15 Bratislava, Slovakia P. Gadas : R. Škoda Department of Geological...Jezuitské Lesy granitic pegmatite near Bratislava, SW Slovakia, contains a variety of Nb-Ta oxide minerals |  | | Journal (volume) | | 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 .................................originating deep in the lower crust and upper mantle region evolved as immiscible carbonate/silicate phases...Fluid overpressure in andesite melts from Central Slovakia: evidence from inclusions in minerals. Petrology...xenoliths, fragments and phenocrysts from Săpânţa Valley (Igniş Mountains, Romania). Rom. Jour. of Min. |  | | 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...Madenköy Mine, Çayeli, Rize Province, Black Sea Region, Turkey (sample: Halbach); XPL If marked in description... Taymyrskiy Autonomous Okrug, Eastern-Siberian Region, Russia (sample: Melcher/Oberthür); PPL D Fine-grained |  | | Journal (article/letter/editorial) | | Depositional Placer Accumulations in Coarse-Grained Alluvial Braided River Systems J. P. BURTON AND PHILIP...Depositional paleoplacer accumulations in coarse alluvial braided river systems form by the concentration...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...complexity complicates distinguishing between placers formed primarily by erosion † Corresponding author: |  | 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) | | and in basalt sample and trachybasalt from the valley flood basalts. The chemical composition of sapphire...“Baikalkvartssamotsvety” enterprise that explored the region in 1986–1988. These works revealed increased concentrations...pyrope and chrysolite in alluvial–deluvial, alluvial–proluvial, and alluvial deposits on the slopes of...spaced 20 m were drilled across the Naryn-Gol Creek valley. In total, thirty-eight 1–2 m deep boreholes were...magmatic deposits. Sapphires are extracted from placers associated with intraplate alkali basalts in Australia |  | | 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 |  | | Book (edition) | | sedimentary and metamorphic rocks and in residual and alluvial deposits. Special attention was paid to localities...dept. (departement), dept. (departamento), dist. (district). Less common terms are not abbreviated, e.g.... canton (Switzerland), vilayet (Turkey), region (Chile), kray and oblast (Russia). The country names...by Mobutu, and is now the Katanga administrative region again. The former Kivu province is now divided...United States or of the Upper Silesian historical region in Poland, where the importance of ore-bearing |  | | Journal (article/letter/editorial) | | Tyuyamunite Ulexite Ullmannite Ulvite Umangite Uraninite Uranophane Uranospinite Uranothorite Uvarovite...the Alpine region, and (3) Mid-Triassic to early Jurassic extension in the extra-Alpine region. Isotope...used to recover lead) nor as fossil fuels (see uraninite considered as an energy source in power plants)...make a contribution to the cultural heritage of a region and may successfully be used in exploration (Mascaro...two years. The economic potential of a particular region or mining camp can be deduced from the economic | | | Journal (article/letter/editorial) | | Tyuyamunite Ulexite Ullmannite Ulvite Umangite Uraninite Uranophane Uranospinite Uranothorite Uvarovite...the Alpine region, and (3) Mid-Triassic to early Jurassic extension in the extra-Alpine region. Isotope...used to recover lead) nor as fossil fuels (see uraninite considered as an energy source in power plants)...make a contribution to the cultural heritage of a region and may successfully be used in exploration (Mascaro...two years. The economic potential of a particular region or mining camp can be deduced from the economic |  | | Book | | Host-Rock Inflation by Veins and Dikes at Grass Valley, California / 210 Econ. Geology 36:143,163-174...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...(<;atal Htiytik), Mesopotamia (Sumer), and the Indus Valley (Harappa and Mohenjo-Daro) worked in gold obtained |  | Seifert, Wolfgang, Förster, Hans-Jürgen, Rhede, Dieter, Tietz, Olaf, Ulrych, Jaromír (2012) Mineral inclusions in placer zircon from the Ohře (Eger) Graben: new data on “strontiopyrochlore”. 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 |  | | Book | | ... ... .... . .... ..... . . ...... . Zoned Uraninite Pegmatites ....................................... . .... .. .. ....... .. . . . Consolidated Placers ............. ... ................... .... .. ... . Zr-Fe 3.......... . 5. Anions Examples Uraninite Pyrochlorc-microlite, apatite, zirkelite, crandalJite...cro]j te Uraninite, zircon Uraninite Uraninite, fergusonite, samarskite, xenotime Uraninite Urau.inite...always well crystallized. Metamict pitchblende ( uraninite) has been reported ( Conybeare and Ferguson, 1950) |  | | Journal (article/letter/editorial) | | 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...Inagli Pt–Au placer deposit is hosted by modern alluvial sediments of the Inagli River that drains the...the heavy mineral fraction extracted from modern alluvial sediments of the Inagli River, within the Inagli...the Inagli massif with the location of the Pt–Au alluvial placer deposit and the sampling site. Modified |  | | Book | | "Broadly regarded, the depth ta which a metalliferous region has been eroded affects its present characteristics...same manner in which detrital heavy minerals in placers are enclosed in the sediments with which they formed...Batholith near Arequipa, Toquepala-Cerro Verde district; in the centre, Morococha and in the north, Michiquillay)...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...BALKHASH (PRIBALKHASH) REGION, KAZAKHSTAN, U.S.S.R. This is an outstanding region of Permo-Carboniferous |  | Giuliani, Gaston, Fallick, Anthony, Rakotondrazafy, Michel, Ohnenstetter, Daniel, Andriamamonjy, Alfred, Ralantoarison, Théogène, 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...−0.3 and 16.5‰. The ruby and sapphire found in placers linked to alkali basalt environments in the northern...δ18O values between 3.5 and 6.9‰. Ruby from the placers of Vatomandry and Andilamena has δ18O values of...9‰, and between 0.5 and 4.0‰, 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 |  | | Journal (article/letter/editorial) | | W) and gold metallogeny of the Central Africa Region: a review W. L. Pohl*1, M. Biryabarema2 and B....significance in the Central Africa or Great Lakes region, i.e. gold, tin, tantalum and tungsten, are part...author, email walter@walter-pohl.com 66 A wide region in Central Africa is marked by abundant tin, tantalum... W) and gold metallogeny of the Central Africa Region Provinces of the Democratic Republic of the Congo...molybdenite, beryl and amblygonite were byproducts. The region is geologically known as the intracontinental Mesoproterozoic |  | | Book | | when it was mainly obtained from depos- its of alluvial type. Ancient Egyptians mined gold as early as...weathering, accumulates as secondary deposits in alluvial material. Primary deposits originate as a result...deposits. Tiny platelets of gold in geologically old alluvial deposits became part of sedimentary rocks in which...layers of comparatively large extent, such as alluvial de- | posits at Witwatersrand, South Africa. Apart...triangular striation (5), wires, or flakes. In alluvial deposits massive gold may be found. The largest |  | | Book | | "Broadly regarded, the depth to which a metalliferous region has been eroded affects its present characteristics...same manner in which detrital heavy minerals in placers are enclosed in the sediments with which they formed...Batholith near Arequipa, Toquepala-Cerro Verde district; in the centre, Morococha and in the north, Michiquillay)...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...BALKHASH (PRIBALKHASH) REGION, KAZAKHSTAN, U.S.S.R. This is an outstanding region of Permo-Carboniferous |  | | 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 | | Eduardo Zappettini Enigmatic Alluvial Sapphires from the Orosmayo Region, Jujuy Province, Northwest Argentina:...Sutherland, Martin Danišı́k, Glenn Poirier, John W. Valley and Ralph Rowe Zircon Xenocrysts from Cenozoic.... . . . . . . . . 347 Harald G. Dill Gems and Placers—A Genetic Relationship Par Excellence Reprinted...Cr-Bearing Andradite (var. Demantoid) from Dobšiná, Slovakia Reprinted from: Minerals 2019, 9, 164, doi:10...important sources (i.e., Afghanistan (Panjsher Valley), Brazil (Itabira), Colombia (Coscuez), Ethiopia |  | | Journal (article/letter/editorial) | | þþ þþþ þþ þþ þþ un Zircon Monazite Xenotime Uraninite Uranophane (II) Saccharoidal albite (I, II) Quartz*...columbite-tantalite crystals 9 the Himalaya District, southern California, Černý et al., 2004; Namivo...minerals in alluvial placers from Limbach, Bratislava Massif, Western Carpathians, Slovakia: compositional |  | | Book | | 1 , Le gisement de molybdenite d'Azegour et la region des Guidmioua (Atlas de Marrakech, Maroc): Libr...band of Anougal that lies on the west flank of the valley of Anougal, with which no mineable mineral con...south part of the Ouiazzane Ridge and separates the valley of Anougal (east) and Ouadaker (west); it is cut...Farther south, near the town of Entifa (in Adrhous valley), are lenses of garnet and pyroxene, the lenses...only the schists and the calcareous beds of the region are considered, the beds can be connected by a |  | | Book | | when it was mainly obtained from deposits of alluvial type. Ancient Egyptians mined gold as early as...weathering, accumulates as secondary deposits in alluvial material. Primary deposits originate as a result...deposits. Tiny platelets of gold in geologically old alluvial deposits became part of sedimentary rocks in which...layers of comparatively large extent, such as alluvial deposits at Witwatersrand, South Africa. Apart...triangular striation (5), wires, or flakes. In alluvial deposits massive gold may be found. The largest | | | Book | | when it was mainly obtained from deposits of alluvial type. Ancient Egyptians mined gold as early as...weathering, accumulates as secondary deposits in alluvial material. Primary deposits originate as a result...deposits. Tiny platelets of gold in geologically old alluvial deposits became part of sedimentary rocks in which...layers of comparatively large extent, such as alluvial deposits at Witwatersrand, South Africa. Apart...triangular striation (5), wires, or flakes. Jn alluvial deposits 1nassive gold may be found. The largest |
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