The noble metal distribution in the black shales of the Degdekan gold deposit in Northeast Russia

Ханчук, А. И.; Plyusnina, L. P.; Nikitenko, E. M.; Kuzmina, T. V.; Barinov, N. N.

doi:10.1134/s1819714011020059

Cited by 14 publications

(9 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The presence in the ores of these NMs and the possibility of their extraction can supplement significantly the range of already known platinum-bearing ore formations and essentially increase the value of the extracted Au ore raw materials in the deposits where platinoids accompany Au mineralisation. The geological setting and mineralogical features of these objects are given in detail elsewhere [13,[40][41][42][43][44][45]. Their brief characteristics are presented below.…”

Section: Previous Studies and Problem Statementmentioning

confidence: 99%

“…Ore mineralisation is formed in two stages: hydrothermal-metamorphogenic and hydrothermal [43]. The absolute age of Au mineralisation by U-Pb-SHRIMP is estimated at 133-137 m.y., and by the Ar-Ar method at 137 m.y., i.e., the formation of ore refers to the beginning of the early Cretaceous [44,45]. The main vein mineral is quartz.…”

Section: The Degdekan Depositmentioning

confidence: 99%

“…Its fineness varies within the range 740-800% . Electrum and kustelite are extremely rare [43,44]. The Au-arsenopyrite-polymetallic (with pyrite) mineral assemblage stands out as a productive one [43].…”

Section: The Degdekan Depositmentioning

confidence: 99%

See 2 more Smart Citations

Distribution of “Invisible” Noble Metals between Pyrite and Arsenopyrite Exemplified by Minerals Coexisting in Orogenic Au Deposits of North-Eastern Russia

et al. 2019

View full text Add to dashboard Cite

The study focused on the forms of occurrence and distribution of hidden (“invisible”) noble metals (NMs = Au, Ag, Pt, Pd, Ru) in the coexisting pyrites and arsenopyrites of four samples of mineral associations from three Au deposits in the north-east of Russia. The unique nature of our approach was the combination of methods of local analysis and statistics of the compositions of individual single crystals of different sizes. This allowed us to take into account the contribution of the surface component to the total NM content and to distinguish the structurally bound form of the elements. The following estimates of the distribution coefficients of the structural (str) and surficial (sur) forms of elements were obtained: D ¯ P y / A s p s t r = 2.7 (Au), 2.5 (Pd), 1.6 (Pt), 1.7 (Ru) and D ¯ P y / A s p s u r = 1.6 (Au), 1.1 (Pd), 1.5 (Pt and Ru). The data on Ag in most cases indicated its fractionation into pyrite ( D ¯ P y / A s p s t r = 17). Surface enrichment was considered as a universal factor in “invisible” NM distribution. A number of elements (i.e., Pt, Ru, Ag) tended to increase their content with a decrease in the crystallite size in pyrite and arsenopyrite. This may be due to both the phase size effect and the intracrystalline adsorption of these elements at the interblock boundaries of a dislocation nature. The excess of metal (or the presence of S vacancies) in pyrite increased Ag and Pt content in its structure and, to a lesser extent, the content of Ru, Pd and Au. Arsenopyrite exhibited a clear tendency to increase the content of Pt, Ru and Pd in samples with excess As over S. Sulphur deficiency was a favourable factor for the incorporation of Ag and platinoids into the structures of the mineral associations studied. Perhaps this was due to the lower sulphur fugacity. Pyrite with excess Fe was associated with higher contents of some NMs. The presence of other impurity elements was not an independent factor in NM concentration.

show abstract

Section: Previous Studies and Problem Statementmentioning

confidence: 99%

Section: The Degdekan Depositmentioning

confidence: 99%

See 1 more Smart Citation

Distribution of “Invisible” Noble Metals between Pyrite and Arsenopyrite Exemplified by Minerals Coexisting in Orogenic Au Deposits of North-Eastern Russia

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Presence of this noble metal in ores and the possibility of its extraction can significantly complement the range of known platinum-bearing ore formations and considerably increase the value of extracted gold at the fields, where platinoids accompany gold mineralization. The geological setting and mineralogical features of these objects (except for Zolotaya Rechka, see below) are given in detail in [42][43][44][45][46][47].…”

Section: Natural Materialsmentioning

confidence: 99%

Trace Element Partitioning Dualism under Mineral–Fluid Interaction: Origin and Geochemical Significance

et al. 2018

View full text Add to dashboard Cite

Trace element (TE) partitioning in the system "mineral-hydrothermal solution" is studied by the method of thermo-gradient crystal growth coupled with internal sampling of a fluid phase. The analytical procedure used enables evaluating of structurally bound and superficially bound modes of TE in crystals and determining corresponding dual partition coefficients. The case of precious metals (PM-Au, Pt, Pd) at 450 and 500 • C and 100 MPa pressure is considered. The minerals are pyrite, As-pyrite, magnetite, Mn-magnetite and hematite and fluids are ammonium chloride-based hydrothermal solutions. The partition coefficients for structural and surficial modes, D str p and D sur p , are found to be unexpectedly high (except for Au in pyrite). High concentrations of PM are attributed to superficial nonautonomous phases (NAPs), which can be considered as primary concentrators of PM. We also have studied the co-crystallization (exchange) coefficients (D e) of REE (Ce, Eu, Er, Yb) and Fe in magnetite and hematite at 450 • C and 100 MPa. D sur e is elevated to two orders of magnitude as compared to D str e. It is shown that not only physicochemical parameters affect REE distribution in hydrothermal systems, but also NAP presence and its composition. The crystal growth mechanism specified by the agency of NAP is suggested. The study of PM distribution in natural pyrite of gold-ore deposits supported the importance of differentiating between structurally and superficially bound TE modes for correct use of experimental D values to determining element concentrations in ore-forming fluids.

show abstract

“…При дозировании ручной пи-петкой S r возрастает в два раза. Диапазон опре-деляемых концентраций составляет от 0.03 до 20 г/т, что удовлетворяет потребностям геологораз-ведки [15,[25][26][27].…”

Section: результаты и их обсуждениеunclassified

Atomic absorption determination of gold and silver in rocks and ores using double-stage probe atomization in the graphite furnace

Zakharov¹,

Окунев²,

Hasanova³

et al. 2013

АиК

View full text Add to dashboard Cite

1Казанский (Приволжский) федеральный университет Российская Федерация, 420008, Казань, ул. Кремлевская, 18 1 ООО «Атзонд» Российская Федерация, 420111, г. Казань, ул. Чернышевского, д. 17/38 Yuri.Zakharov@kpfu.ru Поступила в редакцию 6 августа 2013 г., после исправления -7 октября 2013 г.Предложен новый способ количественного определения золота и серебра в суспензи-ях горных пород и руд с помощью атомно-абсорбционного спектрометра, оснащенного бло-ком зондовой атомизации и системой перемешивания пробы барботированием. Размолотый геологический образец выдерживается 20 минут в смеси кислот HNO 3 и HCl (1:3). Затем он разводится в 5 раз водой для получения суспензии с концентрацией 100 мг/мл, которая непо-средственно вводится в графитовую печь спектрометра. Применена техника двухстадийной атомизации с использованием независимо нагреваемого U-образного вольфрамового зонда. Она позволила минимизировать фотометрические шумы, устранять матричные помехи при определении золота и разбавлять атомный пар непосредственно в атомизаторе для увеличе-ния верхнего предела определения серебра в случае богатых пород и руд. Обеспечена воз-можность использовать представительные навески вещества (~кг) и простые водные раство-ры элементов для калибровки. Рабочий диапазон определяемых содержаний золота 0.03-20 г/т, а серебра 0.0004-4.5 г/т. Правильность проверена на ГСО черного сланца СЧС-1, руды Су-хого лога СЛг-1 и золотосодержащей руды СЗР-4. Продолжительность анализа в целом 1.5-2 ч.Ключевые слова: атомно-абсорбционный анализ, графитовый атомизатор, двухстадий-ная зондовая атомизация, золото, серебро, горная порода, руда, черный сланец, суспензия. Область научных интересов -атомно-абсорбционная спектрометрия. Захаров ВведениеОпределение следовых концентраций бла-городных металлов в рудах и горных породах яв-ляется актуальной задачей. Образцы считаются промышленно золотоносными при содержаниях 2 г/т. Для их анализа привлекается широкий круг методов [1, 2], в том числе современные инстру-ментальные, такие как химико-спектральный [3], сцинцилляционный атомно-эмиссионный [4], атом-но-абсорбционный [5, 6], масс-спектрометрический с индуктивно связанной плазмой, нейтронно-акти-

show abstract

The noble metal distribution in the black shales of the Degdekan gold deposit in Northeast Russia

Cited by 14 publications

References 3 publications

Distribution of “Invisible” Noble Metals between Pyrite and Arsenopyrite Exemplified by Minerals Coexisting in Orogenic Au Deposits of North-Eastern Russia

Distribution of “Invisible” Noble Metals between Pyrite and Arsenopyrite Exemplified by Minerals Coexisting in Orogenic Au Deposits of North-Eastern Russia

Trace Element Partitioning Dualism under Mineral–Fluid Interaction: Origin and Geochemical Significance

Atomic absorption determination of gold and silver in rocks and ores using double-stage probe atomization in the graphite furnace

Contact Info

Product

Resources

About