Nano-sized gold in ores of the Pokrovskoe deposit

Moiseenko, V. G.; Moiseenko, N. V.; Safronov, P. P.

doi:10.1134/s1028334x10120111

Dokl. Earth Sc.

2010

DOI: 10.1134/s1028334x10120111

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Nano-sized gold in ores of the Pokrovskoe deposit

V. G. Moiseenko

N. V. Moiseenko

P. P. Safronov

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Cited by 4 publications

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“…4): spheroidal (20-120 nm), triangular, and hex agonal (300-700 nm). A similar pattern of "the starry sky" represented by nanoparticles of native gold in adu lar of the Pokrovskoe deposit was demonstrated in [15].…”

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confidence: 67%

Biogenic gold accumulation in brown coals at the peat stage

2012

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confidence: 67%

Biogenic gold accumulation in brown coals at the peat stage

2012

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“…The distribution of nanogold spheroids in adular is heterogeneous. In some parts high portions of them are registered reach ing 100 pieces per 10-30 µm 2 , in other parts of the same area, there were a little more than 10 pieces, whereas in some areas they are absent completely [4]. The concentration of silver is higher than that of gold by a factor of 4.2, but the areas of the highest concen trations of spheroidal nanosilver and nanogold "stars" are spatially distant from each other.…”

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Accumulation of gold nanominerals during the formation of ores of the Pokrovskoe deposit

Moiseenko

2012

Dokl. Earth Sc.

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The Pokrovskoe gold deposit is situated in the west ern part of the Umlekano-Ogodzhinskii volcanoplu tonic belt, localized in Cretaceous granitoids of the Sergeevskii massif and in younger volcanogenic for mations of the Ulunginskaya volcanotectonic struc ture [1]. Granitoids and volcanic rocks break Upper Jurassic terrigenous series enriched in interbeds of car bonaceous argillite. According to the level of gold ore in the structures of Mesozoic tectonomagmatic activ ization, the deposit corresponds to subvolcanic ones [2]. According to the peculiarities of the mineral com position, it is related to the gold-adular-quartz or poor sulfide formation [3]. The deposit is character ized by great abundance of faults and rocks, which underwent propylitization, argillization, sulfidization, and silicification. Ore zones are represented by the totality of steeply and gently pitching quartz and quartz-carbonate veins, veinlets, and breccias of quartz composition located in the zones of jointing and tectonic dislocations. Five stages of ore formation are distinguished on the deposit: (1) quartz-hema tite-pyrite; (2) productive gold-carbonate-quartz;(3) main productive gold-adular-quartz; (4) quartzcarbonate-sulfide; and (5) barren quartz-carbonate. Zones of vein-impregnation mineralization repre sented by a network of thin quartz veinlets with impregnation of pyrite, chlorite, and hematite were formed at the first stage. The second stage is character ized by thick veins of fine granular quartz with a small concentration of gold. The third stage is the most pro ductive and represented by two associations: goldadular-quartz and gold-sulfide. Banded colloform textures of ores are typical of gold bearing quartzadular formations. In addition to the prevailing pyrite, the gold-sulfide association contains small portions of galena, sphalerite, pyrargyrite, proustite, polybasite, and other rare ore minerals. Quartz-sulfide and quartz-carbonate-sulfide veinlets with pyrite, arse nopyrite, chalcopyrite, siderite, and apatite with rare elements were formed at the fourth stage. The post ore, carbonate stage is represented by veinlets and thin veins of quartz-dolomite and calcite compositions. Accounting for the difficulties in extraction of gold minerals as a whole and especially nanominerals and the fragility of sulfides, the methodology of sample preparation without grinding was originally worked out for study of gold nanoparticles in mineral aggre gates. For this purpose, a representative sample (50-300 km) is passed in a sparing mode through a jaw crusher with successive change of the hole size to -1 mm at the exit. The +1 mm fraction is returned for further crushing, and usually 3-4 cycles are required for separation of the whole sample into two fractions: -1+0.08 and -0.08 mm. Using such method, we divide natural gold into two classes: visible and invisi ble to the naked eye (nanosized by 90%). Then we obtain two concentrates of heavy minerals with gold, which are studied on a scanning microscope and ana lyzed by different metho...

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Structurally and superficially bound gold in pyrite from deposits of different genetic types

Таусон

Kravtsova

Smagunov

et al. 2014

Russian Geology and Geophysics

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The gold distribution in 32 pyrite samples and some samples of other ore minerals is studied using the method of statistical samplings of analytical data for single crystals. The samples were recovered from deposits of different genetic types within the largest gold provinces of Russia and Uzbekistan. The contents of uniformly distributed gold and the ratios of its structurally to superficially bound forms have been determined. According to the Au–As diagram for the chemical states of gold, uniformly distributed gold in pyrite is chemically bound in the overwhelming majority of cases. The previous experimental data suggest that it is partly incorporated into pyrite and partly into the structures of nanosized nonautonomous phases on the surface of the pyrite crystals. Micro- and nanoparticles of native gold might appear during postgrowth transformations of these phases. Data on the other ore minerals suggest that the dependence of the content of uniformly distributed gold on the size or specific surface area of the crystal and the superficial position of its considerable part are common to the ore minerals. It is shown for pyrite that the observed features are commonly found at deposits of different genetic types, only with differences in the slope and determination coefficients of the dependences. The size dependences of the contents of gold and other elements in pyrite are genetically significant, because they give an insight into the ore-forming processes. The data on structurally bound gold permit comparative evaluation of gold concentrations in ore fluids forming gold deposits of different genetic types.

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Nano-sized gold in ores of the Pokrovskoe deposit

Cited by 4 publications

References 1 publication

Biogenic gold accumulation in brown coals at the peat stage

Biogenic gold accumulation in brown coals at the peat stage

Accumulation of gold nanominerals during the formation of ores of the Pokrovskoe deposit

Structurally and superficially bound gold in pyrite from deposits of different genetic types

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