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double refractory gold deposits

  • MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY …

    MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY …


    implemented by Barrick to treat double refractory gold ore following pressure oxidation at its Goldstrike Mine in Nevada USA The CSIRO reagent system is an alternative to cyanide and has particular application where cyanide cannot be used and to unlock stranded high-grade deposits

  • Biological pretreatment of carbonaceous matter in double

    Biological pretreatment of carbonaceous matter in double


    Gold extraction refers to the processes required to extract gold from its ores This may require a combination of comminution mineral processing hydrometallurgical and pyrometallurgical processes to be performed on the ore Gold mining from alluvium ores was once achieved by techniques associated with placer mining such as simple gold panning and sluicing resulting in direct recovery of

  • Gold processing 101 - Mining Magazine

    Gold processing 101 - Mining Magazine


    R Badri and P Zamankhan Sulphidic refractory gold ore pre-treatment by selective and bulk flotation methods Advanced Powder Technology 24 2 2013 512 519 CrossRef Google Scholar

  • Gold s new golden moment - FL

    Gold s new golden moment - FL


    Oct 06 2016· In gold mining terms failing to get it right means that gold recovery rates can be unpredictable and thiosulfate consumption can be very high pushing up costs The success of the thiosulfate project will allow Goldstrike to process four million ounces of double-refractory ore that would otherwise have been processed at the end of the mine

  • Gold extraction - Wikipedia

    Gold extraction - Wikipedia


    Gold processing - Gold processing - Mining and concentrating The nature of the ore deposit determines the mining and mineral processing techniques applied Oxide ore deposits are frequently of such low grade e g 3 to 10 parts per million that extensive mineral processing cannot economically be justified In this case they are merely shattered by explosives and then piled into heaps for

  • Extraction of Gold from a Low-Grade Double Refractory Gold

    Extraction of Gold from a Low-Grade Double Refractory Gold


    While not all new discoveries are refractory this indicates that it is becoming increasingly harder to find economically viable large gold deposits A need for technologies to treat smaller deposits Industry data show that the amount of gold contained in refractory measured and indicated M I resources is approximately double the amount of

  • Refractory ore chemistry Britannica

    Refractory ore chemistry Britannica


    A significant contemporary challenge for gold mining companies is to define economic process options for treating more complex ore bodies as the less refractory ores become depleted Demonstration of economic treatment options allows gold companies to maintain and increase their ore reserves

  • Refractory ore trouble Russian gold miners - Mining South

    Refractory ore trouble Russian gold miners - Mining South


    implemented by Barrick to treat double refractory gold ore following pressure oxidation at its Goldstrike Mine in Nevada USA The CSIRO reagent system is an alternative to cyanide and has particular application where cyanide cannot be used and to unlock stranded high-grade deposits

  • REFRACTORY GOLD - PanTerra Gold Limited

    REFRACTORY GOLD - PanTerra Gold Limited


    Goldstrike is Barrick s largest and most productive mining operation with gold production of more than 40 million ounces since 1987 It is located on the Carlin Trend approximately 40 km north-west of Elko Nevada USA with the objective of improving the gold recovery process for double refractory ores processed in the Autoclave

  •  PDF Pressure oxidation of double refractory gold

    PDF Pressure oxidation of double refractory gold


    May be increasing gold recovery from refractory gold ore with grade 2-3 g t to 90-95 Actual data of top refractory gold ore mines show that gold recovery is 70 and less What is reason It is a problem in minerals processing or it is a global science problem So if you work with refractory ore

  • Biooxidation of a double-refractory gold-bearing sulfide

    Biooxidation of a double-refractory gold-bearing sulfide


    Mar 19 2009· The invention relates generally to recovery of gold and or silver and particularly to recovery of gold from refractory and double refractory materials BACKGROUND Many precious metal deposits currently processed throughout the world are sulfidic in nature and present challenges in the extraction and recovery of the contained gold

  • ALTA Gold 2012 E-Doc - Albion Process

    ALTA Gold 2012 E-Doc - Albion Process


    A new technology to improve gold recovery in the processing of double refractory ores which often resulted in native carbon competing with activated carbon and limiting gold recovery commonly

  • The reasons of gold refractory Gold ore classification

    The reasons of gold refractory Gold ore classification


    The reason of the gold mineral refractory There are so many types of reasons that caused the difficulty of gold ore processing including physical element chemical element and mineralogical element

  • Refractory Gold Mining SGS

    Refractory Gold Mining SGS


    Here the gold is further concentrated by the action of water Because gold is heavier than most of the material moved by a creek or river it can become concentrated in hollows and trapped in the bed of the river These are known as secondary alluvial gold deposits and they can be worked using a gold pan or cradle Alluvial gold deposits

  • Processing Refractory Gold - Hydrometallurgy Leaching in

    Processing Refractory Gold - Hydrometallurgy Leaching in


    Other articles where Refractory ore is discussed gold processing Extraction from refractory ores Many gold-bearing ores and concentrates are not readily amenable to cyanidation owing to the presence of substances that consume the cyanide reagent before it can dissolve the gold preferentially adsorb the gold as it dissolves a phenomenon called preg-robbing or completely surround the…

  • Gold s new golden moment - FL

    Gold s new golden moment - FL


    For processing the deposits that contain refractory gold ore a separate ROT plant with a nominal capacity of 1 2 Mt y will be installed adjacent to the existing Sabodala plant with processing expected to begin in 2023 The ROT design is based on the use of bacterial oxidation BIOX technology to expose the gold that is occluded within

  • Gold mineral processing

    Gold mineral processing


    Sep 28 2016· Speaking at the same forum Vasilyev said Yakutia had some of the biggest resources of refractory gold in Russia The three largest gold deposits in the province —Nezhdaninskoye Kyutchus and Tarynsky — have estimated reserves of approximately 900 tonnes

  •  PDF Pressure oxidation of double refractory gold

    PDF Pressure oxidation of double refractory gold


    Dec 23 2018· In 2001 when the gold price was just $272 oz gold mining companies had cash costs of $176 an ounce giving a 54 margin However by 2006 the gold …

  • Gold processing - Mining and concentrating Britannica

    Gold processing - Mining and concentrating Britannica


    To complicate matters further these ore bodies are often refractory where the gold is locked within sulphide minerals or double refractory in which gold is locked within sulphide minerals and preg-robbing due to the presence of organic carbon

  • Refractory Gold Ore Treatment Methods

    Refractory Gold Ore Treatment Methods


    Abstract Double refractory gold ores such as Barrick s Goldstrike ore contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon In this research microwave roasting of a double refractory gold ore was investigated as an

  • Double-Refractory Carbonaceous Sulfidic Gold Ores

    Double-Refractory Carbonaceous Sulfidic Gold Ores


    A two-stage bacterial pretreatment process for double refractory gold ores R K Amankwah a W -T Yen a J A Ramsay b a Mining Engineering Department Queen s University Kingston Ontario Canada K7L 3N6 b Chemical Engineering Department Queen s University Kingston Ontario Canada K7L 3N6 Received 7 April 2004 accepted 11 May 2004 Abstract Double refractory gold concentrates were

  • Microwave pretreatment of a double refractory gold ore

    Microwave pretreatment of a double refractory gold ore


    Jan 01 2016· Figure 50 1 shows typical gold deportment of two double-refractory ores a and b compared with a nonrefractory oxide ore c The main gold carrier in the ore shown in Figure 50 1 a is pyrite the ore has a total sulfide content of 1 43 and a TCM content of 0 94

  • Barrick Thiosulfate Leaching of Double Refractory Ore

    Barrick Thiosulfate Leaching of Double Refractory Ore


    Mining Refractory Gold SGS has earned the reputation as the world s leading gold metallurgical testing facility Our decades of experience have allowed us to assemble the most comprehensive assortment of expertise and equipment to address refractory gold issues

  • ALTA MetBytes - What s Happening in Gold Ore Processing

    ALTA MetBytes - What s Happening in Gold Ore Processing


    Highly refractory gold mineralisation including double refractory ores i e gold associated with both sulphide and carbonaceous mineralogy Low to middle-tier resources that target a gold production of less than 150 000 oz per annum

  • Extraction of Gold from a Low-Grade Double Refractory Gold

    Extraction of Gold from a Low-Grade Double Refractory Gold


    The pressure oxidation approach that allows obtaining high gold recovery from double refractory materials was proposed $ 7$ POX residue of concentrate fro m the B akyrchyck deposit gold

  • Gold Geoscience Australia

    Gold Geoscience Australia


    A notable example of such a double-refractory carbonaceous sulfide ore is at Barrick s Goldstrike Mine where gold occurs in pyrite in refractory sulfide ore and double-refractory sulfidic carbonaceous ore These ores are pretreated by autoclave and roaster prior to cyanide leaching Thomas et al 2000 Wickens et al 2003 In the Jinya

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