... and will typically require application of the newer nanoscale imaging and analytical technologies to evaluate this. Fig. 7. Photograph of coarse-grained electrum dendrites from the highgrade epithermal Knob Hill vein, Republic district (Washington, USA). These dendrites served as protrusions along the vein...

..., 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...

...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...

... 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...

... 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...

... 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...

... → 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...

..., 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...

.... 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...

... alloys. To describe the composition of solid solutions of this ore triad, we propose to use the following conventional names: high-fineness copper gold (compositions Au 1–0.88 Cu 0.00 n –0.12– Au 0.56–0.44 Ag 0.44–0.32 Cu 0.00 n –0.12 ), copper electrum (Au 0.56–0.44 Ag 0.44–0.32 Cu 0.00 n –0.12...

... 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...

... 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...

... by the Mineralogical Society of America 2009 gold grains electrum alloy annealing gold nuggets Elemental gold is relatively rare (∼1 ppb) in the Earth's mantle and continental crust and is a trace constituent (∼1 ppm) in some meteorites ( Palme and O'Neill 2003 ). As a metal, gold has a high melting...

..., 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...

...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...

...-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...

...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...

... 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...

...) 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 (e.g. Morávek et al. , 1989 ; Morávek, 1995 a ) and Jílové ( Morávek, 1971 ; Morávek...

... 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 . babingtonite skarn gold El Valle-Boinás Spain The skarn...