 | | Journal (volume) | | IATAN Heavy metals in Vereda’s 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 CAPARAÓ |  | | 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 recognized—rhodian 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 |  | | Journal (article/letter/editorial) | | minerals Article Gems and Placers—A 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 “Chessboard |  | Palyanova, Galina, Kutyrev, Anton, Beliaeva, Tatiana, Shilovskikh, Vladimir, Zhegunov, Pavel, Zhitova, Elena, Seryotkin, Yurii (2023) Pd,Hg-Rich Gold and Compounds of the Au-Pd-Hg System at the Itchayvayam Mafic-Ultramafic Complex (Kamchatka, Russia) and Other Localities. Minerals, 13 (4) 549 doi:10.3390/min13040549 | Journal (article/letter/editorial) | | grains from heavy concentrates of the Itchayvayam placers and watercourses draining and ore samples of the...draining and heavy concentrates of the Itchayvayam placers contain substitution structures formed by Pd,Hg-rich...of native gold composition for the Itchayvayam placers were received by Sidorov et al. (2009, 2019) [36...malanite (CuPt2 S4 ) was found in the Itchayvayam River. The attempts to obtain a crystal structure for...(Kamchatka, Russia), and gold grains from the adjacent placers. Identification and investigation of ternary phases |  | | Journal (article/letter/editorial) | | metamorphism in limestones, e. g., garnet, sphene, magnetite, minerals of pegmatitic origin, e. g., cassiterite...properties of loess-like rocks in the Amu-Dar'ya river valley, by V.L. Dubrovkin and Ye. Cheklina 14. ...characteristics of landslides on the upper course of the Oh' river, by Ye.V. Trepetsov 15. Reworking of the shores...Armenian Cu-Mo ore bodies are found in Yugoslavia, Bulgaria, Kazakhstan, Arizona, and elsewhere and so are...first edition . 9 11 PART I. THE EVOLUTION OF PLACERS CHAPTER I. General considerations 16 INTERNATIONAL |  | | 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...BEUKES Ce A© C C' o O' 4 I]SCALE, M E' MAGNETITE % SAMPLENO. o I 20M , I I I FLOW BAR DIRECTION...DIRECTION EDGE .-.':'•. HIGHEST % MAGNETITE IN X-SECTION FIG.2. Site1, Steelpoort River.A. Mapshowing |  | | Journal (article/letter/editorial) | | Ni-Bearing Pyroxenite–Cortlandite Intrusions and Placers of the Dambuki Ore Cluster, the Amur Region V....characterized by numerous and high-grade gold placers. A few small primary deposits and occurrences of...were formerly considered to be the main source of placers. However, the study of widespread Early Cretaceous...deposits and occurrences also contributed to the placers, but their part was rather small. DOI: 10.1134/S1075701507070197...Amur gold-bearing province is characterized by high-grade and numerous gold placers. Since the end of |  | | Journal (article/letter/editorial) | | dispersed yellow-green mineral from the Central Urals placers. In 1874, it was found to be a gem variety of andradite...serpentine (established by SEM); in one case, magnetite was observed. Hollow canals were usually collected...first discovered in gold-bearing alluvial placers of the Bobrovka river, 100 km NNW from Yekaterinburg...demantoids were discovered in gold-bearing placers near the Bobrovka river (a widespread name for small rivers...the demantoid were identified in the bedrock of placers in the upper reaches of these rivers at the end |  | | Report (volume) | | ABSTRACT Lode deposits of tin, and commercial placers derived from them, almost invariably are associated...level during the Pleistocene, am.d productive placers have resulted from a complex interplay of stream...Australia. As a result, many economically important placers lie seaward of present shorelines. Most tin is...(Cornwall). The minerals customarily associated are magnetite, garnet, pyroxene, fluorite, tourmaline, various...various sulfide minerals, and, in the Lost River area, Alaska, beryllium minerals (Sainsbury, 1964a). The |  | | Report (issue) | | 56 locations consist of 39 lode deposits and 17 placers and contain almost 7.5 million metric tons of tin...distinctly different geologic deposit types: lodes and placers. Figure 3 shows 39 locations of lode deposits and...Rooiberg Zaaiplaats Van Rooi's Vley L _ _ Kuils River of; "' 1 Renison I EXPLANATION Geologic deposit...tin deposits lie in the mid-Tertiary volcanic province of the Sierra Madre Occidental located in central...amenable to normal recovery methods. In the Lost River area Alaska, tin is a potential byproduct of beryllium |  | | Journal (article/letter/editorial) | | http://www.tandfonline.com/loi/tigr20 Formation of alluvial placers on the shelf of the Sea of Japan A. P. Sivoplyas...article: A. P. Sivoplyas (1980) Formation of alluvial placers on the shelf of the Sea of Japan, International...com/page/termsand-conditions Formation of alluvial placers on the shelf of the Sea of Japan Downloaded...process of sedimentation, and the formation of placers of useful minerals. As a basis for the study, we...the water-current valleys is the preservation of alluvial sediments and "released" useful minerals in a |  | | Report (issue) | | 27 Deposits in the drainage basin of the Oconee River, Georgia---------- 27 Alluvium--------------------------...45 Deposits in the drainage basin of the Flint River, Georgia----------- ^7 Alluvium--------------...Deposits in the drainage basin of the Chattahoochee River, Georgia---- 64 Appraisal------------ Alluvium------...97 Eluvial placers------ ----------------------------------------- 100 Alluvial placers in trunk drainage---Summary---...Plate 1. Yadkin River-Dan River area, N. C.-Va.--------------------- 2. Oconee River area, Ga.------- |  | | Journal (article/letter/editorial) | | Placer Accumulations in Coarse-Grained Alluvial Braided River Systems J. P. BURTON AND PHILIP FRALICK†...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...Sand composed of a mixture of quartz, pyroxene, magnetite, and lead was moved over a gravel bed; flow velocity...concentration: erosion and deposition. Erosional placers are produced by the preferential removal, during |  | Barkov, A. Y., Nixon, G. T., Levson, V. M., Martin, R. F. (2009) A Cryptically Zoned Amalgam (Au1.5-1.9Ag1.1-1.4)Σ2.8-3.0Hg1.0-1.2 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 – SIMILKAMEEN RIVER SYSTEM, BRITISH COLUMBIA, CANADA: NATURAL OR MAN-MADE...deposit associated with the Tulameen – Similkameen river system, British Columbia. This amalgam formed at...dans les grains d’alliage Au–Ag trouvés dans les placers un peu partout dans le monde. (Traduit par la Rédaction)...Colombie-Britannique, Canada. Introduction Gold-bearing placers in which Au and Ag are associated with the platinum-group...a placer deposit in the Tulameen – Similkameen river system. We discuss two possible mechanisms of formation |  | | 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 ß The coastal-marine placers have been very unevenly studied. There are extremely...of formation of titanium-pyroxene, magnetite, and similar placers, which serve as a source of commercial |  | | Report (issue) | | Preliminary Grade and Volume Model of Alluvial Sn-Au Placers by James D. Bliss 1 and W. David Menzie2...placer deposits: Grade and volume model of Sn-Au placers is developed from 63 deposits found worldwide The...within the United States from 1990 to 1994 was from placers in Alaska; the amount was negligible (Carlin, 1995)...and tonnage model of Sn placers, an important deposit type. Geology Sn placers develop because Sn, commonly...also concentrate in stream bottom gravel as alluvial placers. Some cassiterite can be trapped in bedrock |  | | Journal (article/letter/editorial) | | Abstract--The present-day contribution of coastal-marine placers into the bulk gold production is insignificant...prospects of the Black Sea shelf for modern gold placers, we have proved the expediency to study the distribution...clastic-authigenic types. According to our data, the alluvial, lagoonal-marine, liman, and other sediments at...the USSR, up to 45% of total gold was mined from placers of the country; the respective world estimate amounts...The coastal-marine placers occupy a modest place among other economic types of placers. According to the |  | | Report (issue) | | Future of Placer Mining in Colorado 26 Geology of Placers 27 Placer Concentration 28 Placer Sources 28 Colorado...31 Eluvial Placers 31 Renee ee Oe Colluvial Placers 31 Alluvial Placers 31 Alluvial Transportation...Transportation 32 Gold Comminution 32 Alluvial Gold Placer Deposition 32 Bedload Gold 32 Skim Bars—Suspension...34 Fan Placers 34 Lakes 34 Glacio-Fluvial Placers and Effects of Glaciation 34 Eolian Placers 36 Marine...Marine Placers 36 Fossil Placers 36 Grades of Placer Deposits 36 Bedrock Prospecting 37 Where to Pan 38 |  | | 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 (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) | | Introduction Numerous gold occurrences, both primary and placers, have been reported from various regions in Ethiopia...and chlorite. Apatite, tourmaline, garnet and magnetite are the common accessories. The gneiss ranges...all known primary gold deposits, occurrences and placers are located principally within the Megado Belt...90%) and of biotite, graphite, iron hydroxides, magnetite and pyrite. These ore bodies occur as stockworks...nearly 50 tonnes of gold has been produced from placers of the Adola area alone until the end of 1996. |  | | Journal (article/letter/editorial) | | to the apron and aureole dynamic types of alluvial placers, which are formed at a distance of 10–30 km...characterized by good round ness and high degree of alluvial refining. It is suggested that endogenic gold...discovery of economic gold and gold–plati num placers in the north of the Urals is associated with the...sediments as quite autochthonous marine, marine–alluvial, and lacustrine facies. This implies that sources...the Urals and that prospecting for noble metal placers should be spread over the Ural Foredeep. RESEARCH |  | 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...country’s total workforce. The artisanal mining of alluvial gold and diamonds has also made a modest contribution...which are part of the Central Atlantic Magmatic Province (CAMP) that was emplaced during the early stages... The total gold endowment of the West African province is about 10,000 tonnes, which is comparable with |  | | 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 |  | Tolstykh, N. D., Foley, J. Y., Sidorov, E. G., Laajoki, K. V.O. (2002) COMPOSITION OF THE PLATINUM-GROUP MINERALS IN THE SALMON RIVER PLACER DEPOSIT, GOODNEWS BAY, ALASKA. The Canadian Mineralogist, 40 (2) 463-471 doi:10.2113/gscanmin.40.2.463 | Journal (article/letter/editorial) | | COMPOSITION OF THE PLATINUM-GROUP MINERALS IN THE SALMON RIVER PLACER DEPOSIT, GOODNEWS BAY, ALASKA NADEZHDA D...of platinum-group minerals from the Salmon River placers, Goodnews Bay, Alaska, are compared with those...platinum-group minerals, Alaskan-type complex, placers, Goodnews Bay, Alaska. SOMMAIRE Nous décrivons...groupe du platine de concentrés prélevés dans les placers de la rivière Salmon, Goodnews Bay, en Alaska,...du groupe du platine, complexe de type Alaska, placers, Goodnews Bay, Alaska. INTRODUCTION Concentrically |
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