| Stepanov, Sergey, Palamarchuk, Roman, Kozlov, Aleksandr, Khanin, Dmitry, Varlamov, Dmitry, Kiseleva, Daria (2019) Platinum-Group Minerals of Pt-Placer Deposits Associated with the Svetloborsky Ural-Alaskan Type Massif, Middle Urals, Russia. Minerals, 9 (2) 77 doi:10.3390/min9020077 | Journal (article/letter/editorial) | minerals (PGM) of eluval, proximal, and distal placers associated with the Ural-Alaskan type clinopyroxenite-dunite...Ural-Alaskan type Svetloborsky massif, Middle Urals. Lode chromite-platinum ore zones located in the Southern part...different distances from the lode source. Eluvial placers are situated directly above the ore zones, and...proximal placer is considered as an example of alluvial ravine placer with the PGM transport distance...isoferroplatinum prevail in the lode ores and placers with different PGM transport distance. In some | | | Journal (article/letter/editorial) | minerals Article Gems and PlacersâA Genetic Relationship Par Excellence Harald G. Dill Mineralogical...absence of heavy metals), can also appear in some placers and won for a profit (agate, amethyst, citrine...trap-site of gemstones (residual, eluvial, colluvial, alluvial, deltaic, aeolian, and marine shelf deposits)...that matter during accumulation of gemstones in placers are their intrinsic value controlled by the size...accumulation. The present study on gems and gemstone placers is a reference example of fine-tuning the âChessboard | | | Journal (article/letter/editorial) | XXâXX SCIENTIFIC COMMUNICATIONS PLATINUM-BEARING PLACERS: MINERAL ASSOCIATIONS AND THEIR 190Pt-4He AND Re-Os...platinum-group mineral (PGM) placers of large areal extent in the river basins of Siberia (Vilyui, Lena...isotope dating of PGMs, and applied to Pt-bearing placers of Siberia. Correlations between the 190Pt-4He...show that the potential sources for some of the placers are likely buried Precambrian mafic-ultramafic...paper can be applied to other cratonic areas with alluvial PGMs of unknown origin. Introduction face (Vysotskiy | | | Journal (article/letter/editorial) | Preliminary classification of coastal-marine placers V.P. Vorob'yev & R.B. Krapivner To cite this article:...(1975) Preliminary classification of coastal-marine placers, International Geology Review, 17:7, 823-829, DOI:...i m i n a r y classification of coastal-marine placers Downloaded by [University of Illinois at Urbana-Champaign]...P. V o r o b yev a n d R Ă The coastal-marine placers have been very unevenly studied. There are extremely...formation of titanium-pyroxene, magnetite, and similar placers, which serve as a source of commercial exploitation | | | Journal (article/letter/editorial) | Siberian Craton: Evidence from mineral inclusions in alluvial diamonds V.S. Shatsky, D.A. Zedgenizov, A.L. Ragozin...Siberian Craton: Evidence from mineral inclusions in alluvial diamonds, Gondwana Research (2014), doi: 10.1016/j...Siberian Craton: evidence from mineral inclusions in alluvial diamonds Shatsky V.S.1,2, Zedgenizov D.A.2,3,...Paleoproterozoic Khapchan fold belt of the Olenek province in the northeastern part of the Siberian Platform...contain olivine, ĐĄr-pyrope garnet, ortopyroxene and chromite. The D olivines have Fo contents between 89 | | | Journal (article/letter/editorial) | Alpine-type ultramafic intrusions and the associated placers in Borneo KE1KO HATTORI Ottawa-Carleton Geoscience...platinumgroup minerals (PGM) in the associated alluvial placers in Borneo, Indonesia/Malaysia. The Osisotope...Osisotope ratios of laurite grains in chromite d e f n e an t87Os/186Os ratio for the 100 Ma mantle source...1870S/186Os ratios was detected among PGM from placers, but no variation was found within individual grains...are consistent with a detrital origin of PGM in placers: the placer PGM originated in the ultramafic section | | | Journal (article/letter/editorial) | ConvergenceZones:A Contribution to the Origin of Alluvial Placers NORMAN D. SMITH Departmentof GeologicalSciences...0561-0128/85/205/1542-852.50 1842 FLOW CONVERGENCE AND ALLUVIAL do not apply. To this end, three active portionsof...easilyextractedfrom loosesediment,derivedfrom ul- PLACERS 1545 Procedure For each site, a map showingthe...convergence imentalsocontained significant quantities of chromite, timeshigherthan background. The effectof flow...sampleF$ (30%)whichshows a that the enrichedmagnetite-chromite sandattained tionis suggested In additionto a | | | Journal (article/letter/editorial) | minerals (coal, phosphate, cement, iron ores, chromite, gold, tin, kaolin, etc.) and oil. However, in...occupies most of the North Vietnam, down to the Ca river fault. With the latter orogeny, considered to be...north of the country, principally along the Red river (fig. 2). The cristaline rocks (migmatites, orthogneisses)...occupation of Indochina in 1884. Coal, gold, tin, chromite, zinc, antimony, apatite, talc and some other...Mt/y), cement (1,6 Mt), phosphate (300 000 t), chromite (3,5 Mt), iron ores, gold (around 1 000 kg, including | | Rakhimov, Ildar R., Saveliev, Dmitri E., Rassomakhin, Mikhail A., Samigullin, Aidar A. (2022) Chromian Spinels from Kazanian-Stage Placers in the Southern Pre-Urals, Bashkiria, Russia: Morphological and Chemical Features and Evidence for Provenance. Minerals, 12 (7) 849 doi:10.3390/min12070849 | Journal (article/letter/editorial) | Article Chromian Spinels from Kazanian-Stage Placers in the Southern Pre-Urals, Bashkiria, Russia: Morphological...+7-919-159-0904 Abstract: Six minor alluvial chromite placers (Kolkhoznyi Prud, Verkhne-Yaushevo, Sukhoy...chemical composition of chromian spinels from all placers is similar and generally correlates with compositions...sources for chromite ores but ophiolitic. The new placers expand the dissemination area of chromite-bearing...prospect to discover new placers. A.A. Chromian Spinels from Kazanian-Stage Placers in the Southern Pre-Urals | | Barkov, A. Y., Nixon, G. T., Levson, V. M., Martin, R. F. (2009) A Cryptically Zoned Amalgam (Au1.5-1.9Ag1.1-1.4)ÎŁ2.8-3.0Hg1.0-1.2 from a Placer Deposit in the Tulameen-Similkameen River System, British Columbia, Canada: Nartural or Man-made?. The Canadian Mineralogist, 47 (2) 433-440 doi:10.3749/canmin.47.2.433 | Journal (article/letter/editorial) | A PLACER DEPOSIT IN THE TULAMEEN â SIMILKAMEEN RIVER SYSTEM, BRITISH COLUMBIA, CANADA: NATURAL OR MAN-MADE...deposit associated with the Tulameen â Similkameen river system, British Columbia. This amalgam formed at...dans les grains dâalliage AuâAg trouvĂ©s dans les placers un peu partout dans le monde. (Traduit par la RĂ©daction)...Colombie-Britannique, Canada. Introduction Gold-bearing placers in which Au and Ag are associated with the platinum-group...a placer deposit in the Tulameen â Similkameen river system. We discuss two possible mechanisms of formation | | | Journal (article/letter/editorial) | data, a general description of platinum-bearing placers of the Siberian Platform is given. Typomorphic...Siberian Platform, the following types of PGM placers have been recognizedârhodian ferroan platinum (Vilyuyan)...part of the Siberian Platform (Lena Pt-bearing province), placer occurrences consisting of a unique association...(rhodian ferroan platinum type) are widespread. These placers are located mainly in channels that drain Mesozoic...platinum alloys (sperrylite-platinum type). These placers are widespread in regions where Proterozoic stratiformly | | Gunn, A.G., Dorbor, J.K., Mankelow, J.M., Lusty, P.A.J., Deady, E.A., Shaw, R.A., Goodenough, K.M. (2018) A review of the mineral potential of Liberia. Ore Geology Reviews, 101. 413-431 doi:10.1016/j.oregeorev.2018.07.021 | Journal (article/letter/editorial) | Putu and Goe Fantro. There is a long history of alluvial diamond production in western and central Liberia...of these are considered to be part of a single province that includes Jurassic age diamondiferous kimberlites...countryâs total workforce. The artisanal mining of alluvial gold and diamonds has also made a modest contribution...phosphate, clays, silica sand, copper, zinc and chromite. Nevertheless, with the exception of iron ore...which are part of the Central Atlantic Magmatic Province (CAMP) that was emplaced during the early stages | | | Journal (article/letter/editorial) | considered to have formed in a high-temperature pre-chromite stage. A sulfide-rich assemblage (erlichmanite...along cracks in contact with secondary ferrian chromite, magnetite and chlorite, or constitute the metasomatic...tempĂ©rature Ă©levĂ©e avant la cristallisation de la chromite. Un assemblage riche en sulfures (erlichmanite...en contact avec des minĂ©raux secondaires comme chromite ferrique, magnĂ©tite et chlorite, ou bien remplacent...INTRODUCTION Platinum alloys are major constituents of alluvial nuggets found in a number of platinum-group-mineral | | | Journal (article/letter/editorial) | considered to have formed in a high-temperature pre-chromite stage. A sulfide-rich assemblage (erlichmanite...along cracks in contact with secondary ferrian chromite, magnetite and chlorite, or constitute the metasomatic...tempĂ©rature Ă©levĂ©e avant la cristallisation de la chromite. Un assemblage riche en sulfures (erlichmanite...en contact avec des minĂ©raux secondaires comme chromite ferrique, magnĂ©tite et chlorite, ou bien remplacent...INTRODUCTION Platinum alloys are major constituents of alluvial nuggets found in a number of platinum-group-mineral | | | Journal (article/letter/editorial) | genetical evolution from their lode deposits to the placers. According to this author, the final PGM suite...alteration from sulfide ores via oxidized ores into placers results from the continuous elimination of unstable...PGM and the dispersion of soluble PGE. The final alluvial PGM assemblage consists of a great number of residual...demonstrated that the degree of alteration of PGM in placers associated with the Ural-Alaskan type Svetloborsky...rarely preserved. The origin of magmatic PGM in chromite deposits associated with ophiolites and Alaskan-type | | | Journal (article/letter/editorial) | Table 1. Fig. 1. Location of diamondiferous alluvial placers in the northeastern Siberian platform (after...kimberlites (Afanasyev et al., 2009). Many diamonds from placers in the northeastern Siberian craton were reported...content within single crystals of diamond from the placers allowed for us to investigate the co-variation...Orlovâs classification (Orlov, 1977), diamonds from placers in the northeastern Siberian craton may be divided...composition and nitrogen content in diamonds from placers of the northeastern region of the Siberian Platform | | | Journal (article/letter/editorial) | com/loi/tigr20 Formation conditions and structure of placers in Severnaya Sos'va auriferous area B.V. Ryzhov...Ryzhov (1973) Formation conditions and structure of placers in Severnaya Sos'va auriferous area, International...00:03 Formation conditions and structure of placers in Severnaya Sos'va auriferous area Downloaded...B.V. Ryzhov Available information on the gold placers of the Northern Urals is very scanty and fragmentary...in small quantity in a whole series of streams. Placers in this area were listed by Rozhkov (7). In the | | | Journal (article/letter/editorial) | Neoarchean fan-delta deposits, western Superior Province, Canada: Sedimentology and provenance Corey Wendland...Archean Alluvial diamonds Diamond deposits Fan-delta a b s t r a c t Most ïŹuvial diamond placers occur...minor enrichments of heavy minerals formed on the alluvial fan-delta surface but the primary cause of the...Witwatersrand Supergroup. The largest diamond placers are those comprising foreshore, spit and bar complexes...(Bluck et al., 2005). These Plio-Pleistocene marine placers formed in a thick succession of cobble- to pebble-sized | | | Book | of Platinum Group Minerals (PGM) Inclusions in Chromite Deposits of the Urals Reprinted from: Minerals...and Gold in the Ophiolite-Related Placer of the River Bolshoy Khailyk, Western Sayans, Russia Reprinted...EnvironmentâFrom SulïŹde Ores via Oxidized Ores into Placers: Case Studies Bushveld Complex, South Africa, and...various Cr-Ni-Cu-PGE deposits and PGE-Au-bearing placers. Federica Zaccarini from Modena, Italy obtained...genetical evolution from their lode deposits to the placers. According to this author, the ïŹnal PGM suite which | | Barkov, Andrei Y., Tolstykh, Nadezhda D., Shvedov, Gennadiy I., Martin, Robert F. (2018) Ophiolite-related associations of platinum-group minerals at Rudnaya, western Sayans and Miass, southern Urals, Russia. Mineralogical Magazine, 82 (3) 515-530 doi:10.1180/mgm.2018.82 | Journal (article/letter/editorial) | describe similar assemblages of minerals found in two placers in Russia, both derived likely from an ophiolitic...The first is located along the River Rudnaya in the Western Sayan province, Krasnoyarskiy kray, and the...complexes are potential hosts for ore deposits of chromite and minerals of the platinum-group elements (PGE)...first of these occurrences is located along the River Rudnaya in the Ermakovskiy district, near Shushenskoye...Priyeniseiskiy territory of the western Sayan province, Krasnoyarskiy kray (Fig. 1). This placer is associated | | | Journal (article/letter/editorial) | Stanaway* Placers deposits are now known from five sedimentary environments; washout, river, aeolian,...processes but one will usually predominate. Denudation placers all sit on or just above erosive scour surfaces...For example, deposits from a waning flood-stage river will include many different size, shape and density...particles but a subsequent lower energy normal river flow might remove only the smaller, flatter or the...denudation placers to achieve high concentrations of particular minerals. Denudation placers have a small | | | Journal (article/letter/editorial) | kimberlites. The main indicator minerals are pyrope, chromite, and ilmenite. Ilmenite grains have a zoned structure...cutout is relatively small and large-scale diamond placers should not be expected. Keywords: GuineanâLiberian... The local population has mined diamonds from alluvial placer deposits since the early 1990s. In 1997... SOREM again began developing alluvial placers along the Towabo River, and the first kimberlite was discovered...600-m-wide ore-controlling zone in the Towabo and Bobiko river valleys, which are governed by the same fault zone | | Nesterenko, Gleb V., Zhmodik, Sergey M., Belyanin, Dmitriy K., Airiyants, Evgeniya V., Karmanov, Nikolay S. (2019) Micrometric Inclusions in Platinum-Group Minerals from Gornaya Shoria, Southern Siberia, Russia: Problems and Genetic Significance. Minerals, 9 (5) 327 doi:10.3390/min9050327 | Journal (article/letter/editorial) | inclusions in platinum-group minerals (PGMs) from alluvial placers carry considerable information about types...genetic interpretations. The PGM grains from alluvial placers of the Gornaya Shoria region (Siberia, Russia)...investigation. The PGM grains originate in alluvial gold placers of Gornaya Shoria (Western Siberia) (Figure...and Pd values were identified in early Cambrian chromite-rich ultramafic rocks, several layered peridotiteâgabbro...Srednyaya Tersâ massif; 3, Seglebir massif and placers of Gornaya Shoria; (c) geological map Srednyaya | | | Journal (article/letter/editorial) | greisen deposits, copper-porphyry ore beds, alluvial placers, copper-bearing sandstones, and ferruginous...types may differ widely. For example, whereas chromite or pegmatite deposits occur in all the geologically...grounds for distinguishing two or more types of chromite deposits, of which the age range is very great...enormous reserves. The Precambrian of India has many chromite deposits, associated with the oldest formation...of the Dharwar system. In the Krishna region, chromite lenses are found in pyroxenite belts, alternating | | 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 |
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