Results 261 to 270 of about 326,224 (305)
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Electrolytic Gold Deposition on Dodecanethiol-Modified Gold Films
Langmuir, 2009The electrochemical nucleation and growth of Au from a Au sulfite electrolyte onto dodecanethiol-modified Au surfaces is investigated by a combination of microscopy and chronoamperometry methods. The self-assembled dodecanethiol monolayers are continuous but exhibit defects in correspondence of the Au grain boundaries and on top of Au terraces ...
Gyana, Pattanaik +3 more
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1987
Placer deposits provided early man with the first samples of gold and thereafter have accounted for a large production of the metal. If we include the Witwatersrand and other quartz-pebble conglomerates as fossil placers or modified placers, the placer type of auriferous deposit has provided more than two thirds of the world’s store of gold, about 80 ×
J. B. Tyrrell +12 more
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Placer deposits provided early man with the first samples of gold and thereafter have accounted for a large production of the metal. If we include the Witwatersrand and other quartz-pebble conglomerates as fossil placers or modified placers, the placer type of auriferous deposit has provided more than two thirds of the world’s store of gold, about 80 ×
J. B. Tyrrell +12 more
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2016
Brief description of the several orogenic gold deposits is provided together with the basic principles of the gold projects evaluation. Emphasis is made on methodology of the gold deposits sampling, geological interpretation and estimation resources.
Ulrich Kretschmar, Derek McBride
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Brief description of the several orogenic gold deposits is provided together with the basic principles of the gold projects evaluation. Emphasis is made on methodology of the gold deposits sampling, geological interpretation and estimation resources.
Ulrich Kretschmar, Derek McBride
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MRS Proceedings, 1988
ABSTRACTMetallic gold was deposited on several different substrates by laser pyrolysis of a goldcontaining ink. The gold was deposited in the form of lines by translating the substrate during laser pyrolysis; linewidths ranged from 10 Am to 1.5 mm. This process was performed in open air.
Jeffrey A. Sell +2 more
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ABSTRACTMetallic gold was deposited on several different substrates by laser pyrolysis of a goldcontaining ink. The gold was deposited in the form of lines by translating the substrate during laser pyrolysis; linewidths ranged from 10 Am to 1.5 mm. This process was performed in open air.
Jeffrey A. Sell +2 more
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Gold deposits rich in bismuth minerals: An important type of gold deposits
2005Several gold deposits, both in China and abroad, are drawing attention because of their abundant bismuth minerals. Comparative studies on some of them indicate that certain characteristics can aid in identifying standards and exploration criteria of the type of gold deposits. Firstly, the lode gold ore bodies are structurally controlled.
Ren Yunsheng +2 more
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Economic Geology, 1970
Studies of fresh carbonate host rocks and unoxidized gold ores of the Carlin mine indicate that gold, quartz, barite, pyrite, and other sulfides were introduced into the Roberts Mountains Formation by acid hydrothermal solutions. Laboratory investigations on the carbonaceous materials in the host rocks and ores and studies of reactions between ...
Arthur S. Radtke, Bernard J. Scheiner
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Studies of fresh carbonate host rocks and unoxidized gold ores of the Carlin mine indicate that gold, quartz, barite, pyrite, and other sulfides were introduced into the Roberts Mountains Formation by acid hydrothermal solutions. Laboratory investigations on the carbonaceous materials in the host rocks and ores and studies of reactions between ...
Arthur S. Radtke, Bernard J. Scheiner
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Transactions of the IMF, 1987
Comparaison de deux methodes de mesure: l'une basee sur le principe d'Archimede et l'autre consistant a comparer l'epaisseur des depots par fluorescence ...
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Comparaison de deux methodes de mesure: l'une basee sur le principe d'Archimede et l'autre consistant a comparer l'epaisseur des depots par fluorescence ...
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1999
Abstract Epithermal ore deposits form in the shallow portions of hydrothermal systems, from the surface to less than about 1-km depth. The hydrothermal activity is associated with contemporaneous volcanism and related magma intrusions, and the ore is hosted typically by volcanic rocks.
Jeffrey W. Hedenquist, Antonio Arribas
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Abstract Epithermal ore deposits form in the shallow portions of hydrothermal systems, from the surface to less than about 1-km depth. The hydrothermal activity is associated with contemporaneous volcanism and related magma intrusions, and the ore is hosted typically by volcanic rocks.
Jeffrey W. Hedenquist, Antonio Arribas
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1989
Abstract When the price of gold rose from about $200 (U.S.) an ounce in 1979 to nearly $700 an ounce by the end of the same year, the gold rush of the 1980s was under way. Gold production in the western world rose dramatically; from 1981 to 1986 production increased by 300 to 1,282 metric tons per year.
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Abstract When the price of gold rose from about $200 (U.S.) an ounce in 1979 to nearly $700 an ounce by the end of the same year, the gold rush of the 1980s was under way. Gold production in the western world rose dramatically; from 1981 to 1986 production increased by 300 to 1,282 metric tons per year.
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1993
The primary role of gold mining in the economy is wealth creation. Wealth is generated by finding, delineating, and developing economic gold deposits and, then, mining, recovering and selling gold from them. Thus, economic deposits are the focal point of the gold-supply process.
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The primary role of gold mining in the economy is wealth creation. Wealth is generated by finding, delineating, and developing economic gold deposits and, then, mining, recovering and selling gold from them. Thus, economic deposits are the focal point of the gold-supply process.
openaire +1 more source