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electrum

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Journal Article
Journal: SEG Discovery
Published: 01 July 2022
SEG Discovery (2022) (130): 15–21.
...., 2018 ; Zeeck et al., 2021 ). At the bonanza Sleeper epithermal deposit, the principal ore mineral electrum, which consists of both colloidal particles and their aggregates, was codeposited in numerous bands with amorphous silica ( Fig. 1 ). The millimeter- to centimeter-scale aggregates are composed...
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Journal Article
Published: 12 May 2022
Mineralogical Magazine (2022) 86 (4): 619–633.
..., 2.6% Pb and 3.8% Zn. The deposit comprises a number of distinctive lodes with each containing a distinctive ore and alteration/gangue mineralogy, though generally the sulfide ore comprises various mixtures of sphalerite, galena, chalcopyrite, pyrrhotite and relatively common visible gold–electrum...
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Journal Article
Published: 01 October 2021
American Mineralogist (2021) 106 (10): 1654–1667.
...Haiming Liu; Georges Beaudoin Abstract Native Au-Ag alloys (electrum) are the predominant precious metal host in Au-bearing volcanogenic massive sulfide (VMS) deposits. The chemical composition and distribution of electrum records crystal growth and post-crystallization processes. In this study, we...
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Journal Article
Published: 01 October 2019
Russ. Geol. Geophys. (2019) 60 (10): 1119–1140.
... and the Shamanovskaya, Pineginskaya, Osinovaya, and Barguzinskaya veins of the Kedrovskoe deposit have been described. Quartz–pyrite assemblage (quartz-1, pyrite, pyrrhotite, and marcasite) and quartz–gold–sulfide assemblage (quartz-2, galena, chalcopyrite, sphalerite, electrum, fahlore, Ag tellurides, and sulfosalts...
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Journal Article
Journal: Economic Geology
Published: 01 September 2019
Economic Geology (2019) 114 (6): 1021–1031.
... with this thrust occurs within the Ruth Well Formation, an Archean mafic volcano-sedimentary sequence. Within the mineralized veins the dominant ore minerals are pyrite (FeS 2 ), chalcopyrite (CuFeS 2 ), chalcocite (Cu 2 S), cobaltite (CoAsS), and electrum (Au,Ag). The genesis of the Carlow Castle deposit is still...
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Journal Article
Published: 01 May 2016
The Canadian Mineralogist (2016) 54 (3): 681–706.
... Formation. The hypogene ore association at Capricornio is represented by Au-Ag alloy (“electrum”, containing on average 60 wt.% Au), Ag-sulfoarsenides, Ag-sulfoselenides, Ag-sulfoantimonides, Ag-sulfosalts, and acanthite, as well as by base metal sulfide minerals including galena, pyrite, chalcopyrite...
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Journal Article
Published: 01 September 2015
Russ. Geol. Geophys. (2015) 56 (9): 1332–1348.
... → argental gold (medium- and low-fineness gold) → electrum + Ag-bearing and argental fahlores (up to 50 wt.% Ag) ± acanthite ± hessite; (2) high-fineness gold → Hg-bearing and mercurian gold → mercurian electrum → mercurian kustelite → Au-bearing mercurian silver; and (3) high-fineness gold → mercurian gold...
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Journal Article
Published: 01 August 2015
European Journal of Mineralogy (2015) 27 (5): 639–649.
..., matildite, schapbachite, hessite, molybdenite, arsenopyrite, sphalerite, electrum, auroan silver, an Ag 4 Sb phase, and a Ni-Ag-Sb phase. Arsenopyrite and loellingite are the dominant minerals in the arsenopyrite association. Minor and rare minerals present in this association include chalcopyrite, electrum...
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Journal Article
Published: 01 August 2014
American Mineralogist (2014) 99 (8-9): 1774–1782.
.... The first group comprises several PGM compounds of Pd-Sb, Pd-Sb-As, Pd-Cu-Sb, Pt-Sb, Pt-As-S, Ru-As-S, Ru-S, along with free grains of Ni-Fe-As. The second consists of sperrylite (PtAs 2 ), members of the sobolevskite-kotulskite series, and electrum. These results are in good agreement with previous...
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Journal Article
Published: 01 March 2014
Russ. Geol. Geophys. (2014) 55 (3): 349–360.
...., 1987 ; Novgorodova et al., 1977 ; Pokrovskii et al., 1979 ; Spiridonov and Pletnev, 2002 ). Lozhechkin (1939) revealed a phase inhomogeneity in copper gold, and the latter is platy intergrowths of copper gold with electrum, formed as a result of Ag–Au–Cu exsolution. Murzin et al. (1987...
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Journal Article
Published: 01 October 2013
Mineralogical Magazine (2013) 77 (7): 3039–3046.
... and baryte ores. These fractures house veinlets that contain a number of Ag-As-Sb-Pb-rich sulfosalts, tetrahedrite-tennantite, realgar, pyrite and electrum. Barikaite appears as inclusions in guettardite. The mineral is opaque, greyish black with a metallic lustre; it is brittle without any discernible...
FIGURES
Journal Article
Published: 01 April 2011
Russ. Geol. Geophys. (2011) 52 (4): 443–449.
... to identify and analyze the solid products. It has been established that acanthite, solid solutions Ag 2- χ Au χ S ( χ < 0.5), and electrum are produced in the Ag-rich binary system Ag 2 S–Au 2 S. Petrovskaite, high-fineness gold, and sulfur are produced in the systems with low Ag contents ( χ > 1...
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Journal Article
Journal: Elements
Published: 01 October 2009
Elements (2009) 5 (5): 297–302.
... the dependence of grain size on annealing temperature and level of deformation. Modified from Degussa et al. ( 1995 ) © 2009 by the Mineralogical Society of America 2009 gold grains electrum alloy annealing gold nuggets Deformation of Au, like any metal, takes place by the sliding...
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Journal Article
Journal: Economic Geology
Published: 01 January 2009
Economic Geology (2009) 104 (1): 53–72.
..., with total production of about 6 t of gold between 1895 and 1930. The ore is related to an irregular quartz stockwork and is represented by sulfide and electrum impregnations within the quartz gangue and the altered host rocks. Ore grade varies from 4 to 25 g/t Au. The gold is present as macro...
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Journal Article
Published: 01 May 2008
Russ. Geol. Geophys. (2008) 49 (5): 313–322.
...Yu.V. Laptev Abstract We present results of computations on the interaction of solid-phase electrum–argentite–pyrite (weight ratios 2⋅10 −5 /2⋅10 −3 /1 and 2⋅10 −5 /4⋅10 −2 /1) association with Cl-containing aqueous moderately acid solutions (0.5m NaCl, pH = 3.08) at 300 °C and 500 bars. These data...
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Journal Article
Published: 05 October 2007
Russ. Geol. Geophys. (2007) 48 (10): 799–810.
...-carbonaceous, and chloride-sodium-carbonaceous) in the presence and absence of acanthite and pyrite at 25 °C and 1 bar. In closed pyrite-including systems, native silver and kustelite are replaced by acanthite; electrum, by uytenbogaardtite, acanthite, and pure gold; and native gold with a fineness of 700–900...
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Journal Article
Published: 01 July 2007
Exploration and Mining Geology (2007) 16 (3-4): 125–143.
...A.R. Foster; P.J. Williams; C.G. Ryan Abstract Petrographic studies, assay records, and laser ablation–inductively coupled plasma–mass spectrometer (LA-ICP-MS) analyses of major sulfides suggest nearly all of the gold at the Ernest Henry Cu-Au deposit occurs in the form of native gold or electrum...
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Journal Article
Published: 01 June 2004
Mineralogical Magazine (2004) 68 (3): 467–487.
... by paragenetically early Pb-Zn base-metal sulphides with electrum and late, rare Ag-sulphides and Ag-sulphosalts, whereas Group III contains more Ag-sulphides and/or Ag-sulphosalts. Group II is gold-rich, but transitional to Group III. The Au contents and FeS contents of electrum and sphalerite, respectively, from...
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Journal Article
Published: 01 February 2004
Mineralogical Magazine (2004) 68 (1): 31–46.
...-Zn vein/impregnation mineralization (Stříbrná Skalice, Rudolfov, and others, Fig. 1) are present within the 'Blanice' fault zone. They postdate the electrum-bearing mineralizations. Most of the deposits in the central part of the Bohemian Massif belong to the first group, of which the Mokrsko...
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Journal Article
Published: 01 November 2003
European Journal of Mineralogy (2003) 15 (6): 1069–1077.
... are calcite, quartz, hydroxyapophyllite, hydroandradite, prehnite, pumpellyite-(Fe +2 ), Cu-sulphides and electrum. The babingtonite formation is related to the locally Aldepleted aqueous fluids at relative high fO 2 and low XCO 2 . * Corresponding author, e-mail: mcepedal@geol.uniovi.es 09 07...
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