Patents Assigned to Gold Corporation
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Patent number: 11639540Abstract: The present disclosure is directed to a gold recovery process in which activated carbon or another carbon-based material is used to accelerate thiosulfate leaching of gold from a gold-bearing material. In some embodiments, the gold recovery process comprises providing particulate activated carbon or another carbon-based material, providing a precious metal-bearing material, contacting the precious metal-bearing material with the particulate carbon-based material, thiosulfate, an anion exchange resin, and an oxidant to form a slurry comprising a slurried precious metal-bearing material, and leaching a precious metal from the slurried precious metal-bearing material.Type: GrantFiled: January 21, 2020Date of Patent: May 2, 2023Assignee: BARRICK GOLD CORPORATIONInventors: Oscar German Olvera Olmedo, Daniel Feliks Raphael Domanski
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Patent number: 11401580Abstract: The disclosure relates to pre-treatment of precious metal-bearing oxide ores, prior to precious metal leaching by thiosulfate. The process comprises mixing oxide ore in oxygenated water in the presence of a carbon-based material (e.g., activated carbon or other type of carbon). The carbon-based material can be separated from the ore slurry, and, the gold is thereafter leached by a thiosulfate lixiviant.Type: GrantFiled: January 29, 2020Date of Patent: August 2, 2022Assignee: Barrick Gold CorporationInventors: Yeonuk Choi, Ahmad Ghahremaninezhad Gharelar
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Patent number: 11155894Abstract: A process for reducing arsenic content from arsenic-bearing gold concentrate or other arsenic-bearing gold materials to produce a low arsenic-bearing gold concentrate. The process may comprise adding oxygen, water, and/or acid to an acidulated arsenic-bearing gold concentrate slurry and reacting them together in an autoclave at an elevated pressure and temperature in a pressure oxidation step. In one or more examples, the process may further comprise processing the oxidized concentrate slurry in an arsenic re-dissolution step to dissolve unstable solid arsenic compounds, and applying a first solid/liquid separation and wash step to form a first washed slurry/solid and first acid-containing solutions. The process may further comprise reacting the first washed slurry/solid with sulfur dioxide in a reductive leach step, and applying a second solid/liquid separation and wash step to form a second washed slurry/solid and second acid-containing solutions.Type: GrantFiled: April 28, 2016Date of Patent: October 26, 2021Assignee: Eldorado Gold CorporationInventors: Roman Berezowsky, Paul Skayman, Jinxing Ji
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Publication number: 20200165702Abstract: The disclosure relates to pre-treatment of precious metal-bearing oxide ores, prior to precious metal leaching by thiosulfate. The process comprises mixing oxide ore in oxygenated water in the presence of a carbon-based material (e.g., activated carbon or other type of carbon). The carbon-based material can be separated from the ore slurry, and, the gold is thereafter leached by a thiosulfate lixiviant.Type: ApplicationFiled: January 29, 2020Publication date: May 28, 2020Applicant: Barrick Gold CorporationInventors: Yeonuk Choi, Ahmad Ghahremaninezhad Gharelar
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Patent number: 10597752Abstract: The disclosure relates to pre-treatment of precious metal-bearing oxide ores, prior to precious metal leaching by thiosulfate. The process comprises mixing oxide ore in oxygenated water in the presence of a carbon-based material (e.g., activated carbon or other type of carbon). The carbon-based material can be separated from the ore slurry, and, the gold is thereafter leached by a thiosulfate lixiviant.Type: GrantFiled: October 11, 2017Date of Patent: March 24, 2020Assignee: BARRICK GOLD CORPORATIONInventors: Yeonuk Choi, Ahmad Ghahremaninezhad Gharelar
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Patent number: 10415116Abstract: A method and system are provided in which a gold and/or silver-collecting resin-in-leach circuit comprises both co-current and counter-current sections.Type: GrantFiled: October 5, 2017Date of Patent: September 17, 2019Assignee: Barrick Gold CorporationInventors: Yeonuk Choi, Samir Chefai
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Patent number: 10258996Abstract: The present invention relates to flotation of sulfidic copper-molybdenum- and gold-containing minerals. More specifically, the invention relates to sulfoxy reagent-assisted floatation for separating of sulfides of copper, molybdenum and gold from pyrite, marcasite, pyrrhotite, arsenopyrite, and other gangue minerals following aerating by an oxidizing gas and contacting by a sulfoxy reagent. To promote collection and flotation the feed mineral materials are preferably not contacted with an externally generated non-oxidizing gas to lower the dissolved molecular oxygen content prior to flotation.Type: GrantFiled: March 22, 2016Date of Patent: April 16, 2019Assignee: Barrick Gold CorporationInventor: Barun Gorain
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Patent number: 10239769Abstract: A process for treating contaminated wastewater that includes flowing the contaminated wastewater into at least one pre-pond solids filter tank comprising sand; flowing the contaminated wastewater from at least one pre-pond solids filter tank into at least one sedimentation pond; flowing the contaminated wastewater from the at least one sedimentation pond into at least one filter tank including sand and a mixture of sand and zero-valent iron; and discharging treated wastewater from the at least one filter tank.Type: GrantFiled: November 20, 2015Date of Patent: March 26, 2019Assignee: Atlanta Gold CorporationInventor: Ernest Simmons
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Patent number: 10161016Abstract: The disclosure relates to pre-treatment of precious metal-bearing oxide ores, prior to precious metal leaching by thiosulfate. The process comprises mixing oxide ore in oxygenated water in the presence of a carbon-based material (e.g., activated carbon or other type of carbon). The carbon-based material can be separated from the ore slurry, and, the gold is thereafter leached by a thiosulfate lixiviant.Type: GrantFiled: May 27, 2014Date of Patent: December 25, 2018Assignee: Barrick Gold CorporationInventors: Yeonuk Choi, Ahmad Ghahremaninezhad Gharelar
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Patent number: 10077487Abstract: The disclosure relates to the oxidation and immobilization of trivalent arsenic from arsenic-containing solutions. The process includes oxidation of trivalent arsenic (As3+) species to the pentavalent state (As5+). A carbon additive (e.g., activated carbon) and oxygen are used to promote the arsenic oxidation processes. After oxidation of arsenic to the pentavalent state, the arsenic can be removed by precipitation to ferric arsenate or calcium arsenate or other arsenic containing compounds known in the art. The oxidation of arsenic can also occur simultaneously with the production and precipitation of ferric arsenate (e.g., scorodite). Ferrous iron can be oxidized to ferric iron in the presence of activated carbon and oxygen.Type: GrantFiled: May 27, 2014Date of Patent: September 18, 2018Assignee: Barrick Gold CorporationInventors: Yeonuk Choi, Ahmad Ghahremaninezhad Gharelar, Noelene Ahern
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Patent number: 9790572Abstract: A method and system are provided in which a gold and/or silver-collecting resin-in-leach circuit comprises both co-current and counter-current sections.Type: GrantFiled: August 5, 2013Date of Patent: October 17, 2017Assignee: Barrick Gold CorporationInventors: Yeonuk Choi, Samir Chefai
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Patent number: 9677013Abstract: A method for producing ILSAC GF5 or higher compatible oils from used oil, comprising separating material having a boiling point less than about 350° F. from recovered oil to produce de-volatized oil fraction and light oil fraction. Separating material with a boiling point greater than about 350° F. and less than about 650° F. from the de-volatized oil fraction to produce fuel oil fraction and heavy oil fraction. Separating material with a boiling point greater than about 1200° F. from the heavy oil fraction to produce partially purified oil fraction and residual fraction. Treating the partially purified oil fraction to separate it into purified oil fraction and contaminant fraction. Hydrogenating the contaminant fraction to remove predetermined compounds, further saturating the fraction and thereby creating a saturated oil fraction. Fractionating the saturated oil stream to produce one or more of naphtha fraction, diesel oil fraction and base oil fraction.Type: GrantFiled: March 7, 2014Date of Patent: June 13, 2017Assignee: PNG Gold CorporationInventor: Martin R. MacDonald
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Publication number: 20170152449Abstract: A method for recovering synthetic oils from a feed stream, the method comprising separating at least a portion of the non-synthetic oil constituents from a commingled stream to produce a partially purified synthetic oil stream and one or more contaminant streams. Extracting at least a portion of the synthetic oil from the partially purified synthetic oil stream to produce a synthetic oil stream and a second contaminant stream.Type: ApplicationFiled: February 9, 2017Publication date: June 1, 2017Applicant: PNG Gold CorporationInventor: Martin R. MacDonald
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Publication number: 20170130143Abstract: A method for recovering synthetic oils from a feed stream, the method comprising separating at least a portion of the non-synthetic oil constituents from a commingled stream to produce a partially purified synthetic oil stream and one or more contaminant streams. Extracting at least a portion of the synthetic oil from the partially purified synthetic oil stream to produce a synthetic oil stream and a second contaminant stream.Type: ApplicationFiled: January 26, 2017Publication date: May 11, 2017Applicant: PNG Gold CorporationInventor: Martin R. MacDonald
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Publication number: 20160145134Abstract: A process for treating contaminated wastewater that includes flowing the contaminated wastewater into at least one pre-pond solids filter tank comprising sand; flowing the contaminated wastewater from at least one pre-pond solids filter tank into at least one sedimentation pond; flowing the contaminated wastewater from the at least one sedimentation pond into at least one filter tank including sand and a mixture of sand and zero-valent iron; and discharging treated wastewater from the at least one filter tank.Type: ApplicationFiled: November 20, 2015Publication date: May 26, 2016Applicant: Atlanta Gold CorporationInventor: Ernest Simmons
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Patent number: 9346062Abstract: The present invention relates to flotation of sulfidic copper- molybdenum- and gold-containing minerals. More specifically, the invention relates to sulfoxy reagent-assisted flotation for separating of sulfides of copper, molybdenum and gold from pyrite, marcasite, pyrrhotite, arsenopyrite, and other gangue minerals following aerating by an oxidizing gas and contacting by a sulfoxy reagent. To promote collection and flotation the feed mineral materials are preferably not contacted with an externally generated non-oxidizing gas to lower the dissolved molecular oxygen content prior to flotation.Type: GrantFiled: December 3, 2010Date of Patent: May 24, 2016Assignee: Barrick Gold CorporationInventor: Barun Gorain
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Patent number: 9194023Abstract: A method to recover gold lost in roaster calcine-leach tailings, due to the formation of cyanide refractory compounds or morphologies during the roasting process. The process can include acid leaching of magnetic concentrate from roaster leach tailings, combining the acid leach slurry to the pre-acidulation tank for pressure oxidation feed, acid pressure oxidation of the pressure oxidation feed, and recovery of gold.Type: GrantFiled: October 23, 2013Date of Patent: November 24, 2015Assignee: Barrick Gold CorporationInventors: Qiankun Wang, Nathan Stubina, Wayne Douglas, Todd Esplin, Jodi Esplin, Sajan Bhakta
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Patent number: 9051625Abstract: The present disclosure is directed to a process for recovering a precious metal from a pregnant leach solution using a resin extractant. The precious metal is eluted from the loaded resin using an eluant comprising trithionate. The barren resin is contacted with a sulfide, bisulfide, and/or polysulfide to convert sorbed trithionate to thiosulfate. The desorbed thiosulfate is contacted with an oxidant and converted to trithionate for eluant recycle.Type: GrantFiled: June 15, 2012Date of Patent: June 9, 2015Assignee: BARRICK GOLD CORPORATIONInventors: Yeonuk Choi, Qiankun Wang, John William Langhans, Jr.
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Patent number: 8900535Abstract: In an embodiment, the present invention relates to an apparatus and a process for producing a concentrated form of basic zinc sulphate from a, typically dilute, acidic zinc sulphate-bearing solution. The process embodiment comprises the steps of precipitating the zinc, preferably primarily as basic zinc sulphate, from the acidic zinc sulphate solution, preferably using calcium oxide, in such a way as to promote the formation of separate gypsum crystals and basic zinc sulphate particles, and upgrading the zinc content in the precipitates by separating the basic zinc sulphate from the gypsum using size separation techniques.Type: GrantFiled: January 7, 2011Date of Patent: December 2, 2014Assignee: Barrick Gold CorporationInventor: Yeonuk Choi
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Patent number: D878240Type: GrantFiled: March 2, 2018Date of Patent: March 17, 2020Assignee: Gold CorporationInventor: Steve Osborne