Gold-bearing arsenopyrite in eastern Kazakhstan gold-sulfide deposits

Kovalev, K.R.; Kalinin, Yu. A.; Naumov, E.A.; Kolesnikova, M. K.; Korolyuk, V. N.

doi:10.1016/j.rgg.2010.12.014

Cited by 42 publications

(26 citation statements)

References 12 publications

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“…It is in ter est ing that löllingite anal y ses re veal Au from be low de tec tion limit to 0.2 wt.% (Ap pen dix 2). How ever, gold is sparse, this is the so-called in vis i ble gold (Bark and Weihed, 2007;Kovalev et al, 2011).…”

Section: Fig 4 Thin-sec Tion Pho To MI Cro Graphs With Crossed Polamentioning

confidence: 99%

Petrographic and microprobe study of nephrites from Lower Silesia (SW Poland)

Gil

2013

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Lower Silesia hosts im por tant Eu ro pean neph rite de pos its of Jordanów and less-known of Z³oty Stok. Neph rite ar ti facts were dis cov ered in ar chae o log i cal sites dated back to the Neo lithic pe riod, across Eur asia. Es pe cially ar ti facts found in Po land, Italy and Bul garia may orig i nate from Pol ish nephrites. Now a days, only one ar ti fact is pre cisely linked to Jordanów. Petrographic study of nephrites and chem i cal anal y ses of con stit u ents by means of EMPA al low ac cu rate iden ti fi ca tion of the nephrites. The char ac ter is tic phases of Jordanów tremolite neph rite are ro tated and cataclased di op side porphyroblasts with pres sure shad ows, chlorite lay ers and nests with in ter lock ing non-pseudomorphic tex ture and prehnite veins. The pres ence of hydrogrossular, grossular, ti tan ite, ap a tite with monazite in clu sions, and zir con with pleochroic haloe is typ i cal. Chlorites are usu ally rep re sented by penninite, and mi nor clinochlore and diabantite. The char ac ter is tic fea tures of Z³oty Stok actinolite neph rite are löllingite and di op side crys tals usu ally vis i ble by the na ked eye, with the pres ence of quartz and carbon ates. Löllingite is chem i cally inhomogeneous and gold bear ing. Most of the min er al og i cal-pet ro log i cal fea tures can be ob tained us ing non-de struc tive meth ods.

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Section: Fig 4 Thin-sec Tion Pho To MI Cro Graphs With Crossed Polamentioning

confidence: 99%

Petrographic and microprobe study of nephrites from Lower Silesia (SW Poland)

Gil

2013

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“…Về mức độ phổ biến, xem x t các mẫu đã phân tích có thể thấy trong hầu hết các biến loại mẫu quặng sulfur Suối Củn thường gặp arsenopyrit tinh thể hình kim hoặc lăng trụ k o dài. Đây là n t đặc trưng của các arsenopyrit có triển vọng chứa vàng hạt mịn và xâm tán trong sulfur (Kovalev et al, 2011).…”

Section: Arsenopyritunclassified

“…Tỷ lệ S/As (% nguyên tử) trong arsenopyrit dao động trong khoảng từ 1,05 đến 1,29, thường >1,1 (bảng 4). Hàm lượng As, S và tỷ lệ S/As như vậy khá đặc trưng cho các arsenopyrit chứa vàng và đã được ghi nhận phổ biến trong các văn liệu quốc tế (Maddox et al, 1998, Saha et al, 2002, Kovalev et al, 2011. Các nguyên tố tạp chất có hàm lượng thấp như: Co-dao động từ 0 đến 0,16%, Ni dao động trong khoảng 0-0,03%; Sb-0,01-1,46% (bảng 3).…”

Section: Arsenopyritunclassified

“…Mặc d , một số mỏ nhiệt dịch nhiệt độ thấp có chứa nhiều arsenopyrit với dạng tinh thể nêu trên đã được mô tả ở một số nước trên thế giới, song nhìn chung hình dạng tinh thể này của arsenopyrit không phổ biến và được coi là khá hiếm. Mặt khác, thành phần của chúng đặc trưng thấp As, thấp nhẹ Fe, cao S, tỷ lệ S/As>1,1, là những dấu hiệu rất đặc trưng cho triển vọng vàng hạt mịn và xâm tán trong sulfur của đới khoáng hóa (Maddox et al, 1998, Saha et al, 2002, Kovalev et al, 2011.…”

Section: đặC đIểm Tiêu Hình Của Khoáng Vật Quặngunclassified

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New mineralogical, geochemical and isotopic data of the Au-fulfide ores in the Suoi Cun area

Anh¹

2015

TCCKHVTD

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“…These deposits are characterized by a direct correlation of the contents of gold and arsenic in ores [3,4], as well as by the high gold content in fine needled arsenopyrite [5]. The gold in ore arsenopyrites occurs in metallic and structural forms [6].…”

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Sulfoarsenide complexes of gold in hydrothermal solutions in the formation of gold ore deposits (thermodynamic modeling)

2014

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The necessity and importance of the characteriza tion of the geochemical role of arsenic in the hydro thermal transfer of gold became evident after the dis covery and development of large gold ore deposits of quartz, sulfide-quartz, and sulfide-streaky types with arsenopyrite-pyrite gold productive paragenesis in Russia (Natalka, Nezhdaninskoe, Pogromnoe, etc.) [1], America (e.g., Donlin Creek), and other regions. The significance of sulfide-arsenical ore systems is most pronounced in the genesis of gold deposits of the black shale formation [2].The concentrators of gold at the largest ore fields of this formation are close and fine crystalline aggre gates, as well as individual crystals of the association of arsenopyrite and pyrite (frequently arsenious). These deposits are characterized by a direct correlation of the contents of gold and arsenic in ores [3,4], as well as by the high gold content in fine needled arsenopyrite [5]. The gold in ore arsenopyrites occurs in metallic and structural forms [6]. The line of the Au/As ≈ 0.02 mass ratio in arsenious pyrites separates the areas of metal distribution in the form of Au 0 nanoparticles at higher ratios and the positions of Au + in the structure of the matrix of a concentrator mineral at lower ratios [7].The paragenesis of gold and iron sulfide arsenious phases is most probably caused by the consistent trans fer of Au and As within the sulfuric-arsenious (sul foarsenide) polynuclear complexes occurring in a hydrothermal solution in combination with the hydro sulfide complexes of gold described in [8]. The publi cations [2,9,10] contain data on the dissolution of metallic gold in the hydrosulfide hydrothermal phase of 200-300°C temperature at a pressure up to 1 kbar for the 1.13-12.3 pH range, in the presence of orpi ment As 2 S 3 . Study [11] assumed the formation of either solid solutions or intermetallides of Au and As by the interaction of gold and metallic arsenic at 300°C in chloride solutions (0.01 and 0.1 N HCl) under hydrogen pressure and considered the AuCl · AsH 3 complex in the consistent transfer of Au and As.The data of mineralogy and experiments represent ing the probability of the appearance of gold sulfoars enides in hydrothermal solutions stimulate studies of the conditions of their formation in various ratios to sulfide Au complexes by means of solving the inverse problems of physicochemical modeling (PCM) on the basis of the SELEKTOR software (SW). The present study aimed to reveal the likely composition of sul foarsenide complexes of gold using computer analysis of the experimental data by [2, 10] on the Au solubility in the presence of orpiment.The calculations used numerical correlation of the data of the experimental system by means of the min imization of the difference in the calculated parame ters by the SELEKTOR SW and the values obtained in the experiments over the entire set of initial data, on Abstract-The composition and conditions of the formation of gold sulfoarsenide complexes were studied by means of the solution of inverse ...

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Gold-bearing arsenopyrite in eastern Kazakhstan gold-sulfide deposits

Cited by 42 publications

References 12 publications

Petrographic and microprobe study of nephrites from Lower Silesia (SW Poland)

Petrographic and microprobe study of nephrites from Lower Silesia (SW Poland)

New mineralogical, geochemical and isotopic data of the Au-fulfide ores in the Suoi Cun area

Sulfoarsenide complexes of gold in hydrothermal solutions in the formation of gold ore deposits (thermodynamic modeling)

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