· The Shuiyindong gold deposit is one of the most famous and largest Carlin-type gold deposits in China and is located in southwest Guizhou, in the eastern part of the Huijiabao anticline. The Shuiyindong’s gold mineralization occurred in bioclastic limestone of the Permian Longtan Formation. Sulfur, carbon, hydrogen, oxygen, and lead
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The treatment of preg-robbing gold ores has always been a technical challenge in the gold industry. Early solutions included removal of preg-robbing carbonaceous material by flotation, the addition of kerosene to ‘blind’/passivate the surface of the preg-robbing component, and the most effective
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· Editorial. This volume of Ore Geology Reviews is dedicated to Dr Feng-Jun Nie and credits his significant contribution to understanding the ore deposits of China. In recent years, he has dedicated his life to the study of mineralization in the North China Craton and Central Asian Orogen to the north, and that is the focus of this volume.
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· Refractory gold ore is usually affected by the associated carbonaceous matter through the preg-robbing effect, which is eliminated by oxidation roasting, followed by leaching, to achieve a satisfactory gold leaching efficiency. Roasting–leaching experiments, pore structure measurements, scanning electron microscopy (SEM), and X-ray diffraction
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· Pressure oxidation is a widely accepted method to treat refractory gold ores. Gold recovery is generally lower from alkaline than acidic pressure oxidation discharge due to passivation and incomplete oxidation of mineral. Gold ore from Goldstrike, NV, is a typical refractory gold ore containing sulfide and carbonaceous matter. Alkaline
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· Mining Group (China) The treatment of refractory gold ores has been a major challenge in China’s Gold Industry for the past two decades. The low gold extraction By Dr James Wang, Deputy
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· The contribution of reagent interactions to gold extraction is statistically insignificant. These findings highlight that ammonia pretreatment and ammonia–cyanide leaching are promising approaches for the treatment of
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· 1. Introduction The North China Craton (NCC) is one of the ancient cratons on the earth containing large amounts of the Late Mesozoic gold concentration areas, making it one of the leading gold-producing regions in China (Li et al., 2012, Zhu et al., 2015, Wang et al., 2021).).
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· Trans. Nonferrous Met. Soc. China 25(2015) 597−607 Treatment of copper-rich gold ore by cyanide leaching, ammonia pretreatment and ammoniacal cyanide leaching A. D. BAS, E. KOC, E. Y. YAZICI, H. DEVECI Hydromet-B&PM Group, Division of Mineral
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· Gold Metallurgy. Gold metallurgy is a technology for extracting gold and its compounds from gold ore, gold concentrate, or other gold-bearing materials. Gold is one of the earliest metals discovered and used, and its element symbol comes from the Latin aurum, with the original meaning “the glorious dawn”. As early as the Neolithic Age,
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· Metals Focus' in-depth research in this area shows that approximately 12 per cent of global primary gold production is carried in concentrates. Absolute quantities are shown below, including forecasts to 2025. A Flourish chart. Some mines may produce a copper-gold concentrate, with significant levels of both metals.
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· Shandong Gold Mining (Laizhou) Company Limited, Laizhou, 261441, China Received 11 January 2013; accepted 15 May 2013 Abstract: Carbonaceous gold mines are important refractory gold ores. The previous results demonstrate that the carbonaceous matter is mainly composed of elemental carbon, organic acid and
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· Gold ores with excessive reagent consumption are able to yield acceptable gold extraction provided that reagent demand is met are also referred to as complex ores (La Brooy et al., 1994).
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· Treatment of gold-bearing ore with hydrogen peroxide during heap leaching of gold increases gold recovery by Hydrometallurgy, 9-18 (in Chinese.) [8] Guzman L, Sgarra M, Chimenos J M
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· Among the various forms of gold jewellery in China, fine gold is the most popular, with 24 K gold accounting for more than 80% of the gold jewellery sold in the country. Studies identify a positive relationship between the rate of technical expertise and economic growth in state-owned and mixed sectors of gold industry in China.
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· Electrodeposited antimony can be treated with sulfuration–volatilization technology, which causes antimony to volatilize in the form of antimony sulfide. During this process, gold is enriched in the residue, thereby realizing the value-added use of antimony and the recovery of gold. In this study, the thermodynamic conditions of antimony sulfide
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· The North China Craton (NCC), one of the oldest cratons (~3.8 Ga; Zhai and Santosh, 2013) on Earth, hosts a number of gold deposits that cluster along its northern, southern and eastern margins
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Gold was an important rare and precious metal, always coexists with sulphide minerals such as pyrite and arsenopyrite (Azizi et al., 2010; Nunan et al., 2017). Due to the depletion of high-grade gold ores with large-scale gold ore mining, the attention of gold
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· Hydrothermal mineralization, which is similar for gold ores in both metasedimentary rocks and granitic dikes, is divided into an early ore-stage (Py 1 –quartz; Fig. 7 c), a main ore-stage (Py 2 –Apy 2 –quartz–sericite; Fig. 7
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· Results: 70% of gold extraction for the refractory gold ore; 95% for the oxidised gold ore. Case 5-A chlorine-based solution was used to dissolve gold from a gold concentrate product with high sulfur content, pre-treated by pressure-oxidation (
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· When everyone is trying to cash in with the high price, toll treatment can be a low capital cost method of achieving cash flow for a project. However, there are some issues to be aware of when looking at evaluating toll treatment of a gold deposit. These are outlined by Dean Mitchell of Mineral Engineering Technical Services (METS).
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Pretreatment Process on Refractory Gold Ores with As Xin-yuan NAN, Xin CAI* and Jun KONG School of Electrical Engineering, Xinjiang University, 1230 Yan’an Road, Tianshan District, Urumqi, 830047 P. R. China.
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· The Mayum gold deposit is located in eastern Ngari region, western Tibet, China (Lat. 30 °28′~ 30 °30′, Long. 82 °24′~ 82 °31′), on the Tibetan Plateau ( Fig. 1 ). The average elevation of the deposit is 5300 m above sea level. The deposit is located more than 1500 km west of Lhasa, the capital city of Tibet Autonomous Region.
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· Arsenious and sulphur-bearing micro-disseminated gold ore is a kind of typical refractory Carlin-Type. The gold in Carlin-Type gold ore grains is distributed finely, existing as invisible or submicroscopic gold, encapsulated in arsenopyrite and pyrite. The technical difficulty of treatment Carlin-Type gold ore lies in how to release the fine gold
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· At present, more than 35% of China's gold resources (with a total amount of more than 1,000 tons) or sulfur are difficult to be directly cyanide leached (Lei et al., 2016). However, as the gradual depletion of easy
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· Refractory gold reserves, which require more sophisticated treatment methods in order to achieve oxide-ore recovery rates, correspond to 24 percent of current gold reserves and 22 percent of gold resources worldwide (Exhibit 1). Despite offering a higher grade, these ores can only be processed using specific pretreatment methods
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· gold is more than 85% dealing with the typical ores under a pH of 10~12, NaCN concen tration of 0.1~1.0 g/L, and reaction time of approximately 24 h (Deschênes, 2016). 2.2.
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· Sandaowanzi d eposit, northeast China", Ore Geology Reviews, Vol. 54, pp. 110-126. Mann, A., (1984), "Mobility of gold Traditionally, gold ores are treated by physical and chemical processes
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· China, 19: 707-713. Fleming , C.A. (1992): Hydrometallurgy of precious metals recovery-Hydrometallurgy, 30: 127-162. Habashi Copper-bearing gold ores have proved difficult to treat in
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· Aqueous complexation has long been considered the only viable means of transporting gold to depositional sites in hydrothermal ore-forming systems. Here, we present direct evidence supporting an alternative hypothesis, namely, the transport of gold as colloidal particles. We observed nano-scale gold particles adsorbed on halloysite and
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