 | | 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 .................................massif (1999-2006). Argyrodite is associated with electrum and other Ag-minerals, i.e. acanthite, native...the ideal formula Ag8GeS6. Keywords: argyrodite, electrum, breccia dyke, CĂąrnic Roman mine, RoÈia MontanÄ |  | | Journal (article/letter/editorial) | | Ni-Bearing PyroxeniteâCortlandite 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 |  | 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) | | (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 |  | Lalomov, Alexander, Grigorieva, Antonina, Kotov, Alexei, Ivanova, Lidiya (2023) Typomorphic Features and Source of Native Gold from the Sykhoi Log Area Placer Deposits, Bodaibo Gold-Bearing District, Siberia, Russia. Minerals, 13 (5) 707 doi:10.3390/min13050707 | Journal (article/letter/editorial) | | Bodaibo gold-bearing district in the Lena gold province of Siberia is one of the largest and oldest placer...be a source of local eluvialâproluvial placers, while placers of large valleys are formed due to low-sulphide...The Bodaibo gold-bearing district of Lena gold province is located in Siberia, in the Irkutsk region of...such as the Sukhoi Log are not direct sources of placers because of the fine size of the gold grains. For...such as the Sukhoi Log are not direct sources of placers because of the fine size of the gold grains. For |  | | Journal (article/letter/editorial) | | diggers kxtracting gold ftoh the rock in the Lena River area, Stbefia, ca. 1910. John Taylor postcard. ...Miass state-owned placer mine on the Tashkurganka River. On this occasion General Major Anosov reported...citizens (nongovernment workers) looking for gold in river sand, ca. 1910. John Taylor postcard. Figure 3...northern Russia, near the village of Voitsa in the Vyg River basin, where gold occurred in a quartz vein and...immediately became evident: Gold extracted from placers was five times cheaper than that from the lode |  | | Journal (article/letter/editorial) | | effective method for determining the genesis of placers and the nature of gold ore sources. The results...13, 68 2 of 15 zones of hypergenesis and alluvial placers. As a result of the study, it was found that...mainly aimed at studying the relationship between placers and potential ore sources. This approach allowed...internal structure in placers (gold amalgam and other secondary phases in placers) and also studied the...of formation of a high-grade shell on electrum grains in placers. The authors explained the discovery |  | Fairbrother, L., Brugger, J., Shapter, J., Laird, J.S., Southam, G., Reith, F. (2012) Supergene gold transformation: Biogenic secondary and nano-particulate gold from arid Australia. Chemical Geology, 320. 17-31 doi:10.1016/j.chemgeo.2012.05.025 | Journal (article/letter/editorial) | | well as secondary eluvial-, colluvial- and alluvial placers at increasing distances from primary mineralization...mm in diameter are the most abundant sources of alluvial and eluvial Au, and constitute economically important...Frank.Reith@csiro.au (F. Reith). from soils and placers form by detrital or accretionary processes? (iii)...The occurrence of such Au grains in supergene placers is due to weathering and erosion of host materials...Au grains from related eluvial, colluvial and alluvial settings were selected. 2. Field sites 2.1. Lawlers |  | 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) | | com/loi/tigr20 Certain problems of auriferous lodes and placers N.A. Shilo To cite this article: N.A. Shilo (1968)...(1968) Certain problems of auriferous lodes and placers, International Geology Review, 10:11, 1241-1246...08:17 Certain problems of auriferous lodes and placers N.A. Shilo ABSTRACT: Origins and positions of...of gold fields and ores, particularly of placers, in the Yana-Kolyma area and elsewhere in the Northeast...fields, of lodes to an extent not less than of placers, in the literature of this decade, are evidence |  | dos Santos Alves, Kelvin, Barrios SĂĄnchez, Santos, GĂłmez Barreiro, Juan, Merinero Palomares, RaĂșl, Compaña Prieto, JosĂ© Manuel (2020) Morphological and compositional analysis of alluvial gold: The Fresnedoso gold placer (Spain) Ore Geology Reviews, 121. 103489 doi:10.1016/j.oregeorev.2020.103489 | Journal (article/letter/editorial) | | Pre-proofs Morphological and compositional analysis of alluvial gold: The Fresnedoso gold placer (Spain) Kelvin...Prieto, Morphological and compositional analysis of alluvial gold: The Fresnedoso gold placer (Spain), Ore... Morphological and compositional analysis of alluvial gold: The Fresnedoso gold placer (Spain) Kelvin...processes related to mechanical cold-work in the river load-bed during transport. Keywords: Gold placer...Iberian Massif 1. INTRODUCTION Historically alluvial deposits have been important sources of gold worldwide |  | Prichard, Hazel M., SuĂĄrez, Saioa, Fisher, Peter C., Knight, Robert D., Watson, John S. (2018) Placer platinum-group minerals in the Shetland ophiolite complex derived from anomalously enriched podiform chromitites. Mineralogical Magazine, 82 (3) 491-514 doi:10.1180/minmag.2017.081.099 | Journal (article/letter/editorial) | | documented previously. The focus of this study is alluvial platinum-group minerals (PGM) located in small...alloys, and laurite. Gold also occurs with the PGM. Alluvial PGM have average sizes of 20 x 60 ”m, with sperrylite...the rocks are absent. At Harold's Grave only 3 alluvial PGM (laurite, Ir, Os) and Au were recovered reflecting...Shetland ophiolite complex, Cliff, Harold's Grave, alluvial concentrates, platinum-group minerals, platinum-group...increasing 6 knowledge base regarding whether alluvial PGM are mechanically eroded from their source |  | | Journal (article/letter/editorial) | | zones of mine dumps, gold-bearing tailings and alluvial placers was discovered in the ïŹrst half of the 20...ïŹne- to coarse-grained eluvium and colluvium, 8 â alluvial sediments (Weichselian to Holocene), 9 â kaolindominated...century, gold was recovered from Neogene eluvial/alluvial sediments and hydrothermal quartz veins in the...dewatering of the richest bottom parts of the placers. EïŹorts to resume mining were then made up until...gold at the bottom of the coarse-grained eluvial/alluvial sediments. Gold was mainly associated with pyrite |  | | Journal (article/letter/editorial) | | sphalerite and whereas gold normally occurs as âelectrumâ, also known as unspeciïŹed Ag-rich gold, Au-rich...be due mostly to the leaching-off of Ag from âelectrumâ. Te-rich associations are rare and have complex...1988) or Gold Deposits from the Sonoran Desert Province (PĂ©rez-Segura, 1993); nevertheless, previous names...dissected by the current extensional Basin and Range province, and originated in the active North American...basement rocks and, most especially, with the province of Yavapai Paleoproterozoic granitc rocks, and |  | | Journal (article/letter/editorial) | | deposits and gold-bearing Algoma-type BIF, as well as alluvial gold constitute the new targets for gold in the...near-surface high grade quartz veins and associated alluvial gold. Evidence of the historical mining activity...would have been produced. The production of the alluvial gold was assumed to be of the same order, or maximally...modern placers and CE P lithified placers. Modern placers are subdivided into stream or alluvial, and...and beach placers. Conglomerate represents lithified placers. 3.6.1. Alluvial placers AC The predominant |  | Zhmodik, S.M., Nesterenko, G.V., Airiyants, E.V., Belyanin, D.K., Kolpakov, V.V., Podlipsky, M.Yu., Karmanov, N.S. (2016) Alluvial platinum-group minerals as indicators of primary PGE mineralization (placers of southern Siberia) Russian Geology and Geophysics, 57 (10) 1437-1464 doi:10.1016/j.rgg.2016.09.002 | Journal (article/letter/editorial) | | com/locate/rgg Alluvial platinum-group minerals as indicators of primary PGE mineralization (placers of southern...probe microanalysis (EPMA)). A study of PGM from placers of southern Siberia (Kuznetsk Alatau, Gornaya Shoria...and unrounded PGM grains in many of the studied placers of the AltaiâSayan Folded Area (ASFA) suggests...Keywords: platinum-group minerals (PGM); gold; placers; AltaiâSayan folded area; Kuznetsk Alatau; Salair;...production of gold and platinum-group minerals from placers of Kuznetsk Alatau, Gornaya Shoria, and Salair |  | Nokleberg, W.J., Bundtzen, T.K., Grybeck, D.J., Koch, R.D., Eremin, R.A., Rozenblum, I.S., Sidorov, A.A., Byalobzhesky, S.G., Sosunov, G.M., Shpikerman, V.I., Gorodinksy, M.E. (1993) Metallogenesis of mainland Alaska and the Russian Northeast. Open-File Report Vol. 1993 (93-339) US Geological Survey doi:10.3133/ofr93339 | Report (issue) | | belt (Upper Jurassic to mid-Cretaceous) Kandik River overlap assemblage (Upper Jurassic and Lower Cretaceous)........................................ 16 Yukon River Belt of Podiform Cr Deposits......................vein Deposits..........3Q Northeastern Koyukuk River Belt of Igneous Arc Deposits............................................... ..41 Inferred Anadyr River Belt ofAu Quartz Vein and Associated Deposits ....rocks (Sado-type). Associated minerals include electrum, chalcopyrite, copper and silver sulfosalts, with |  | | 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...ous Upper Witwatersrand System crops out only ("electrum"). The next series of known natural with two small |  | Rea, Maria Angelica, Shuster, Jeremiah, Hoffmann, Veit E., Schade, Markus, Bissett, Andrew, Reith, Frank (2019) Does the primary deposit affect the biogeochemical transformation of placer gold and associated biofilms?. Gondwana Research, 73. 77-95 doi:10.1016/j.gr.2019.04.002 | Journal (article/letter/editorial) | | particles. Gold particles were collected from placers originating from the epithermal system at the Eisenberg...can be shed as particles, e.g., nuggets, into placers, as a result of weathering and erosion. Auriferous...through colluvial, alluvial, aeolian and glacial transport, thereby forming placers (Knight et al., 1999;...2007; Townley et al., 2003; Craw et al., 2017). In placers, gold particles are exposed to physical and biogeochemical...the Silberkuhle. Gold was also recovered from alluvial placer deposits within creeks and rivers draining |  | | Book (volume) | | Nikiforova Criteria for Determining the Genesis of Placers and Their Different Sources Based on the Morphological...patterns of the Turyinsk-Auerbakh metallogenic province [12] and the presence of small non-economic porphyry...placer gold from its morphological characteristics (alluvial, aeolian, pseudoore). The diagnostic method and...morphogenetic criteria for identifying the genesis of placers and different sources in the platform areas developed...Nikiforova, Z. Criteria for Determining the Genesis of Placers and TheirDifferent Sources Based on the Morphological |  | | Book (volume) | | Blagodatnensk, Bodaibo Amur, Urals Primor'e River Basin, 4334/7900 5114/10931 5200/11500 5110/11640... 63 64 crusts deposit 64 (64) 67 basin placers Kuznetsov of and R.V. (Lena Region) the Belogorsk...deposits with Specific deposits of silver The of placers Deluvial and proluvial Metamorphogenic deposits...References General conditions (52) ee PlLacers of River Bodaibo DEPOSITS deposit Keyucht deposit (55)... formed "Gossan' of Matkain Gold-bearing placers Alluvial (35) 46 deposits Deposits deposit OL'khovo |  | Nokleberg, Warren J., Bundtzen, Thomas K., Dawson, Kenneth M., Eremin, Roman A., Goryachev, Nikolai A., Koch, Richard D., Ratkin, Vladimir V., Rozenblum, Ilya S., Shpikerman, Vladimir I., Frolov, Yuri F., Gorodinsky, Mary E., Melnikov, Vladimir D., Ognyanov, Nikolai V., Petrachenko, Eugene D., Pozdeev, Anany I., Ross, Katherina V., Wood, Douglas H., Grybeck, Donald, Khanchuk, Alexander I., Kovbas, Lidiya I., Nekrasov, Ivan Ya., Sidorov, Anatoly A. (1996) Significant metalliferous and selected non-metalliferous lode deposits and placer districts for the Russian Far East, Alaska, and the Canadian Cordillera. Open-File Report Vol. 1996 (96-513) US Geological Survey doi:10.3133/ofr96513a | Report (issue) | | cinnabar, and stibnite. Associated minerals include electrum. chalcopyrite. Cu- and Ag-sulfosalts. with lesser...is interpreted as ancient lithificd sea beach placers that arc often highly metamorphosed and deformed...occurs in the northern part of the Khabarovsk province and is hosted mainly in subhorizontal dolomite...arsenopyrite. tetrahedrite, Ag sulfosalts, native gold, electrum. and argentite. Alteration consists of wide propylitic...deposit closest to this type in Alaska is at Lost River. The largest deposit of this type in the southern |  | | 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 |  | | Book | | Asia Minor in a chariot made of gold called electrum (actually an alloy containing a variable portion...in general.) The riches of Croesus came from a river in his realm named the Pactolus. The origin of the...river's plentiful and easily recovered store of alluvial gold was explained allegorically in the legend... him to bathe in the waters of the River Pactolus. The river then sandy bottom became for centuries...controlled every major source of gold from the Indus River to the Nile. Tribute in gold flowed into Susa, the |  | | Book (edition) | | internal reflections); Madenköy 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:...D E 35 ÎŒ 36 ÎŒ 55 Gold, native Synonym(s): Electrum (Ag), Oro Chemical Composition: Polymorphism with:...contact metamorphic deposits, âą pegmatites, âą placers not known Altaite, Ankerite, Argentite, Arsenopyrite...Witwatersrand field, Gauteng Province, South Africa; PPL B Intergrowth of electrum (yellowish white) and argentite |
|
