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Author: Matthew Francis Mann
Publisher:
ISBN: 9781369885842
Category : Geochemistry
Languages : en
Pages : 128
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Book Description
Invisible gold is a type of gold ore that consists of micrometer sized blebs of native gold and structurally bound gold in iron sulfides, most commonly pyrite, arsenian pyrite and arsenopyrite. Invisible gold is found in hydrothermal-type gold deposits, can make up a large percentage of the gold found in that deposit, and has been noted to be related directly to the arsenic concentration of the crystal, with increasing arsenic concentrations correlating with increasing gold concentrations. The relationship between arsenic and gold was evaluated by conducting experiments at 200 °C, 300 °C, 400 °C, 500 °C and 600 °C. Pyrite or arsenopyrite seed crystals were placed into quartz or silica-based glass vessels with a synthetic hydrothermal fluid and metallic gold for a minimum and maximum of 60 and 370 days, respectively. Run products were analyzed by electron microprobe and laser ablation inductively coupled plasma mass spectrometry. Gold concentrations in arsenopyrite and pyrite rims ranged from 0.058 to 0.685 and 0.011 to 0.073 microg/g at 200 °C, respectively. Gold concentrations were 0.194 to 2.641 and 0.076 to 0.324 microg/g at 600 °C in the rims of arsenopyrite and pyrite, respectively. Gold concentrations were higher in the rims of run product crystals and lower in the crystal cores and were found to increase with increasing temperature. This study showed that the presence of arsenic enhanced the concentration of gold in pyrite and arsenopyrite at the conditions of the experiments, but, the concentrations observed were lower than concentrations observed in some natural samples, which can reach up to 10,000 microg/g. This suggests that surficial processes, most likely through chemisorption and/or electrosorption during crystal growth, attract gold ions, atoms, and/or molecules to the surface of the mineral to aid in enhancing gold concentrations in arsenic-bearing minerals.
Author: Matthew Francis Mann
Publisher:
ISBN: 9781369885842
Category : Geochemistry
Languages : en
Pages : 128
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Book Description
Invisible gold is a type of gold ore that consists of micrometer sized blebs of native gold and structurally bound gold in iron sulfides, most commonly pyrite, arsenian pyrite and arsenopyrite. Invisible gold is found in hydrothermal-type gold deposits, can make up a large percentage of the gold found in that deposit, and has been noted to be related directly to the arsenic concentration of the crystal, with increasing arsenic concentrations correlating with increasing gold concentrations. The relationship between arsenic and gold was evaluated by conducting experiments at 200 °C, 300 °C, 400 °C, 500 °C and 600 °C. Pyrite or arsenopyrite seed crystals were placed into quartz or silica-based glass vessels with a synthetic hydrothermal fluid and metallic gold for a minimum and maximum of 60 and 370 days, respectively. Run products were analyzed by electron microprobe and laser ablation inductively coupled plasma mass spectrometry. Gold concentrations in arsenopyrite and pyrite rims ranged from 0.058 to 0.685 and 0.011 to 0.073 microg/g at 200 °C, respectively. Gold concentrations were 0.194 to 2.641 and 0.076 to 0.324 microg/g at 600 °C in the rims of arsenopyrite and pyrite, respectively. Gold concentrations were higher in the rims of run product crystals and lower in the crystal cores and were found to increase with increasing temperature. This study showed that the presence of arsenic enhanced the concentration of gold in pyrite and arsenopyrite at the conditions of the experiments, but, the concentrations observed were lower than concentrations observed in some natural samples, which can reach up to 10,000 microg/g. This suggests that surficial processes, most likely through chemisorption and/or electrosorption during crystal growth, attract gold ions, atoms, and/or molecules to the surface of the mineral to aid in enhancing gold concentrations in arsenic-bearing minerals.
Author: Paul H. Ribbe
Publisher:
ISBN:
Category : Sulfides
Languages : en
Pages : 302
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Book Description
Author: Mike D. Adams
Publisher: Elsevier
ISBN: 0080459080
Category : Technology & Engineering
Languages : en
Pages : 1077
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Book Description
The gold processing industry is experiencing change. As free-milling and oxide ores become depleted, more complex polymetallic and refractory ores are being processed, coupled with increasing pressure for stricter environmental compliance. Recent years have also seen a steady reduction in mineral processing and metallurgy graduates and a gradual loss of older operating experience. A contribution to documenting current and future best practice in gold ore processing seems timely.The focus of this volume is on advances in current gold plant operation, from conception to closure; chapters also cover innovations at the bench and pilot-scale level that would be expected to find commercial application at some stage. Sufficient coverage is also given to the chemistry and engineering aspects. The general principle behind the structure of the volume is that of flowsheeting based on unit operations and applied to a mineralogical classification of gold ore types. From concept to closure, this book covers all unit operations, mineralogies and processes that are relevant to dealing with today's complex orebodies.Practical experience is vital to the successful development, operation and closure of any operation. The 42 chapters have been contributed by a total of 66 authors and co-authors who are experts from countries spanning the globe, and representing exhaustive practical knowledge covering many disciplines relevant to gold processing.* Current best practice as elucidated by a select panel of experts in the field* Innovations at the bench and pilot-scale level that would be expected to find commercial application at some stage* Mineralogical-based approach to flowsheeting
Author: Mark Graham Aylmore
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The observations on the effects of arsenic residence time, and the relative mobility of solid solution and particulate gold during the thermal decomposition of auriferous arsenopyrite and pyrite, have significant implications for improved industrial extraction of gold from these minerals.
Author: P. Bhakta
Publisher:
ISBN:
Category : Gold
Languages : en
Pages : 20
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Book Description
Author: Soumitro Nagpal
Publisher:
ISBN:
Category : Bacterial leaching
Languages : en
Pages : 264
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Book Description
Author: David Rickard
Publisher: Oxford University Press
ISBN: 0190203684
Category : Science
Languages : en
Pages : 329
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Book Description
Most people have heard of pyrite, the brassy yellow mineral sometimes known as fool's gold. Pyrite behaves like stone and shines like metal, and its dual nature makes it a source of both metals and sulfur. Despite being the most common sulfide mineral on the earth's surface, pyrite's bright crystals have attracted the attention of many different cultures, and its nearly identical visual appearance to gold has led to tales of fraud, trickery, and claims of alchemy. Pyrite occupies a unique place in human history: it became an integral part of mining culture in America during the 19th century, and it has a presence in ancient Sumerian texts, Greek philosophy, and medieval poetry, becoming a symbol for anything overvalued. In Pyrite, geochemist and author David Rickard blends basic science and historical narrative to describe the many unique ways pyrite is integral to our world. He explains the basic science of oxidation, showing us why the mineral looks like gold, and inspects death zones of present oceans where pyrite-related hydrogen sulfide destroys oxygen in the waters. Rickard analyzes pyrite's role in manufacturing sulfuric acid and discusses the significant appearance of the mineral in literature, history, and the development of societies. The mineral's influence extends from human evolution and culture, through science and industry, to our understanding of ancient, modern, and future earth environments. Energetic and accessible, Pyrite is the first book to show readers the history and science of a mineral that helped make the modern world.
Author: Liqiang Yang
Publisher: MDPI
ISBN: 3039212931
Category : Science
Languages : en
Pages : 538
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Book Description
Within the last decade, the high and continuing demand for precious and base metals, as well as critical elements, has prompted a global rush on a scale never before seen. This eventually resulted in the demand for considerable innovation and improvement in mineral deposit genetic modelling and ore formation regimes for the many different types of gold deposits, now recognized, and paralleled by the wide employment of exploration techniques and a rapid expansion of geological databases. This Special Issue will show case studies of porphyry polymetal systems, orogenic gold formations, water–rock reaction, ore-forming structure evolution, mineralogy and petrology of ore deposit, ore formation regime, geochronology and geochemistry of ore deposit, ore-forming evolution, mineral exploration and cutting-edge technology in ore deposit study.
Author: Philippa Fernandes Norman
Publisher:
ISBN:
Category :
Languages : en
Pages : 346
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Book Description
Author: Harold J. Heinen
Publisher:
ISBN:
Category : Cyanide process
Languages : en
Pages : 20
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Book Description
