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Now showing items 7502-7521 of 42285
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(2003)World gold production increased during the last century by more than five times, from approximately 500 to 2544 t in 2000. The shares of gold-only and complex gold-bearing deposits in these values are almost equal. The ...
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(1996)The interaction of gold hydroxo-chloro complexes with iron oxides (ferrihydrites, goethites) during coprecipitation experiments is investigated. Chemical analyses of solids and solutions are coupled with a detailed ...
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(2004)The Uzelginsk deposit in the southern Urals, in Russia, is an example of a weakly altered classical massive sulfide deposit of the Uralian type. Pyritic Cu-Zn ore contains gold in two main modes: so-called "invisible" gold ...
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(1997)Gold and silver accompany the base-metal mineralization developed in the mantle magnesian basalts erupted during the great Tolbachik fissure eruptions of 1975-1976 and the arsenic-antimony-mercury minerals deposited in ...
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(1988)We investigated the gold distribution in reindeer moss growing over gold fields and shows of the gold-quartz and gold-sulfide associations. The gold in the plant ash was determined by means of a spectroscope with a detection ...
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(2001)New data are presented on the gold content of the eruptive and posteruptive exhalations of highly varying temperatures. Deposits that accumulated around fumarole vents show gold concentrations ranging from 0.05 to 2800 ppm ...
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(1988)Humus acids, including humic (HA) and fulvic (FA), are constant components of organic matter (OM) in continental and marine sediments. This paper reports on a study to clarify the relationship between gold and HA in marine ...
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(1990)The area of andesite belts in the Urals is east of the Ural paleo-oceanic region. It has already been established that complexes of different age in this area coincide in space, and that each of them includes specific ore ...
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(1999)On the basis of the multistage model of pyrite formation at low and elevated temperatures, three types of sediments were synthesized: hydrotroilite, dehydrated hydrotroilite, and pyrite. Their sorption capacity with respect ...
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GOLD IN PYRITE FORMATION PROCESSES: 2. PROTON MAGNETIC RESONANCE IN SYNTHETIC GOLD-BEARING PYRITES (2001)Proton magnetic resonance (1H NMR) was used to study synthetic gold-bearing and gold-free iron sulfides, hydrotroilite and pyrite prepared by reacting iron(III) oxide with hydrogen sulfide in a neutral aqueous solution. ...
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(2001)A Mössbauer spectroscopic (MS) study of synthetic gold-bearing iron sulfides (hydrotroilite and pyrite) prepared by reacting iron(III) hydroxide with hydrogen sulfide in neutral aqueous solutions is reported. It is shown ...
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(PANGAEA, 1987-06-18)
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(2003)Gold distribution in sedimentary, volcanic, and intrusive rocks, and mantle xenoliths of the southern Tien Shan and Pamirs is characterized using 2900 analyses. The metal concentration is somewhat higher in the intrusive ...
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(2001)Geology and gold mineralisation of the Sutara and Priamurye auriferous districts in the Jewish Autonomous Region are briefly reviewed in the paper. Placers have being mined for more than a hundred years in these districts ...
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(2001)The geotechnology is defined as a mining method of nonferrous, rare and noble metals by their selective solution with the help of chemical reactants at the deposition place and the following extraction of the chemical ...
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(1998)The solubility of gold was measured in aqueous KCl (0.5 m) solutions under oxygen, sulfur, and slightly acidic pH buffered conditions between 350 and 450°C at a constant pressure of 500 bars. Two buffer assemblages were ...
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(2003)Many gold and polymettalic deposits are disposed within epidote propylites forming external zones of alteration. Preliminary experimental study of epidote stability in chloride solutions defined neutralization of both acid ...
Now showing items 7502-7521 of 42285