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| Number | Title | Issue Date |
| 7285256 | Precious metal recovery using thiocyanate lixiviant Precious metal-containing mineral material is subjected to an acidic thiocyanate leach to dissolve the precious metal as a precious metal-thiocyanate complex. A feed of the thiocyanate leach solution may include a large molar ratio of ferric iron to thiocyanate. Pre... | 10/23/2007 |
| 7282080 | Process for extracting platinum group metals PGMs can be extracted from a source material by heat-treating the source material to form a residue containing PGMs in a cyanide leachable condition and, thereafter, cyanide leaching the residue using a solution containing cyanide to form a pregnant cyanide leach li... | 10/16/2007 |
| 7219804 | Flotation processing including recovery of soluble nonferrous base metal values A method of flotation processing ores and other mineral materials containing soluble nonferrous base metal and sulfide minerals involves dissolving the soluble nonferrous base metal and precipitating the soluble nonferrous base metal in the form of a floatable preci... | 05/22/2007 |
| 7197952 | Testing method for ball mills The invention relates to a testing method for designing a semiautogenous or an autogenous grinding circuit with at least one ball mill for grinding ore. In the method the ore is tested in two separate testing steps using the same testing sample of ore. ... | 04/03/2007 |
| 7157062 | Inhibition of the depletion of metal values from pregnant lixiviant solutions Methods for inhibiting depletion of mineral values from pregnant lixiviant solutions comprise contacting the requisite metal ore with a preg-robbing inhibition agent (PRIA) comprising (I) alkyl polyglucoside surfactants; (II) imidazoline based amphoteric surfactants... | 01/02/2007 |
| 7156894 | Method for recovering metal values from concentrates of sulfide minerals A method of recovering precious metal values from refractory sulfide ores is provided. The method includes the steps of separating clays and fines from a crushed refractory sulfide ore, forming a heap from the refractory sulfide ore, producing a concentrate of refra... | 01/02/2007 |
| 7066983 | Method for thiosulfate leaching of precious metal-containing materials Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polyth... | 06/27/2006 |
| 7025942 | Control of lead nitrate addition in gold recovery A method for controlling the extraction of gold from a gold ore by the cyanidation process in which a leaching step including the addition of a lead compound, which is typically lead nitrate or other lead salt, is used. In order to maintain stable conditions in the ... | 04/11/2006 |
| 7023317 | Cellular transformers The winding of matrix transformers having multiple turn primary windings is made much easier, and the resulting transformer is much more consistent, if a “cellular” insert having a plurality of through holes is placed through each trough hole of the matrix trans... | 04/04/2006 |
| 6855527 | Method of biotreatment for solid materials in a nonstirred surface bioreactor A method of biotreating a solid material to remove an undesired compound using a nonstirred surface bioreactor is provided. According to the method, the surface of a plurality of coarse substrates is coated with a solid material to be biotreated to form a plurality ... | 02/15/2005 |
| 6833021 | Method for treating precious metal bearing minerals A method of processing a mineral composition comprising a refractory material the method comprising milling the composition to a particle size of P80 of less than 25 microns and leaching said composition with a solution comprising lime and/or limestone in... | 12/21/2004 |
| 6663793 | Sol-gel-based composite materials for direct-write electronics applications The present invention relates to a method for producing a low temperature 0-3 composite material, comprising the steps of providing a mixture, wherein the mixture comprises a liquid phase and a particulate phase and wherein the liquid phase comprises a re... | 12/16/2003 |
| 6641642 | High temperature pressure oxidation of ores and ore concentrates containing silver using controlled precipitation of sulfate species A method for the treatment of sulfide ores containing silver by pressure oxidation. The method includes the addition of a sulfate-binding material to reduce the formation of jarosite species during pressure oxidation. Silver can then be recovered from the... | 11/04/2003 |
| 6482373 | Process for treating ore having recoverable metal values including arsenic containing components Roasting of ores with metal values such as precious metal ores for recovery of metal values with conversion of arsenic to an insoluble form in-situ in presence of an additive such as iron and in presence of oxygen injected initially or supplementally in a... | 11/19/2002 |
| 6461577 | Two-stage bioleaching of sulphidic material containing arsenic A method of leaching sulphidic material that contains metals and arsenic under oxidising conditions and with the aid of microorganisms is characterised by mixing the material with an acid aqueous solution to form a pulp, and in that the material is leache... | 10/08/2002 |
| 6451275 | Methods for reducing cyanide consumption in precious metal recovery by reducing the content of intermediate sulfur oxidation products therein Briefly stated, there is provided a method for reducing cyanide consumption in precious metals mining extraction processes involving a sulfur bearing ore body, comprising the steps of providing a precious metal bearing material having intermediate sulfur ... | 09/17/2002 |
| 6410304 | Method of biotreatment for solid materials in a nonstirred surface bioreactor A method of biotreating a solid material to remove an undesired compound using a nonstirred surface bioreactor is provided. According to the method the surface of a plurality of coarse substrates is coated with a solid material to be biotreated to form a ... | 06/25/2002 |
| 6406675 | Method for reducing cyanide consumption during processing of gold and silver ores to remove base metals A method for reducing consumption of cyanide and level of carbon fouling during cyanide extraction of gold and silver from their ores by treating the ore or aqueous slurry of the ore with a water-soluble sequestering agent for the base metal species for a... | 06/18/2002 |
| 6383458 | Biooxidation process for recovery of metal values from sulfur-containing ore materials A process for the recovery of one or more metal values from a metal ore material comprising those of one or more values and a matrix material having a sulfur content wherein the sulfur is present in an oxidation-reduction state of zero or less comprising ... | 05/07/2002 |
| 6355175 | Method for separating and isolating precious metals from non precious metals dissolved in solutions A method for separating gold and/or silver from copper or other contaminant metals is provided in which a suitable filter membrane (64), particularly a nanofilter, is used to form a retentate (134) containing most of the multivalent metal cyanide complexe... | 03/12/2002 |
| 6342190 | Process for increasing recovery of precious metals in an ore processing operation An ore separation process is provided which begins with a specially designed primary grinding mill. The primary grinding mill grinds the ore into a fine powder which is then blown into the primary sizing baghouse which separates the smaller particles from... | 01/29/2002 |
| 6337056 | Process for refining noble metals from auriferous mines A process for refining noble metals from auriferous mines, wherein the auriferous material is first milled and treated with a cyanide solution, and comprising: a step for the pretreatment of the auriferous material, wherein the complexes of cyanide with n... | 01/08/2002 |
| 6248301 | Process for treating ore having recoverable metal values including arsenic containing components Refractory gold ores are roasted in the presence of added fuels in an oxidizing atmosphere in a fluidized bed at a temperature from 450 to 650° C., which is supplied with oxygen-containing gases; to achieve a low ignition and thus low roasting temperatur... | 06/19/2001 |
| 6238632 | Process and composition for removing precious metals from activated carbon A process for removing precious metals from activated carbon. The activated carbon is contacted with an aqueous solution of methyl ethyl ketoxime and sodium hydroxide.... | 05/29/2001 |
| 6234318 | Flotation and cyanidation process control A method for controlling a froth flotation system in a mineral processing operation for recovering metal from a metal source. A rule-based expert system adjusts performance of the froth flotation system.... | 05/22/2001 |
| 6228334 | Method of recovering gold from the fine carbon residue from a coarse carbon gold recovery process A method for recovering gold from gold-loaded fine carbon residue from a coarse carbon gold recovery process is disclosed. The gold-loaded fine carbon residue is mixed with activated coarse carbon and an aqueous solution of a transfer reagent to form a sl... | 05/08/2001 |
| 6210648 | Method for processing refractory auriferous sulfide ores involving preparation of a sulfide concentrate A method is provided for flotation of refractory auriferous sulfide using an oxygen-deficient flotation gas. The method is particularly suited for non-selective flotation of different iron-containing sulfide mineral species. Comminution prior to flotation... | 04/03/2001 |
| 6203708 | Ion exchange resin An ion exchange resin comprising an ion exchange material dispersed or distributed throughout a polyurethane matrix. The ion exchange material is typically a second polymer which has been chemically modified after dispersion or distribution throughout the... | 03/20/2001 |
| 6200545 | Cyanide recovery by solvent extraction The invention provides a process for recovering hydrogen cyanide from an aqueous solution by extracting the hydrogen cyanide into an organic solvent phase. The organic solvent may comprise a neutral organophosphorous compounds, such as compounds selected ... | 03/13/2001 |
| 6183710 | Sodium cyanide paste composition A sodium cyanide composition having a paste-like consistency is provided which comprises sodium cyanide, a base, water, and a rheology modifier. Also provided are processes for producing and using the composition. The composition can be used in applicatio... | 02/06/2001 |
| 6159726 | Method of biotreatment for solid materials in a nonstirred surface bioreactor A method of biotreating a solid material to remove an undesired compound using a nonstirred surface bioreactor is provided. According to the method the surface of a plurality of coarse substrates is coated with a solid material to be biotreated to form a ... | 12/12/2000 |
| 6107065 | Nonstirred bioreactor for processing refractory sulfide concentrates and method for operating same A method of biooxidizing sulfide minerals in a nonstirred bioreactor is provided. According to the disclosed method, a concentrate of sulfide minerals is coated onto a plurality of substrates, such as coarse ore particles, lava rock, gravel or rock contai... | 08/22/2000 |
| 6099615 | Method for improved percolation through ore heaps by agglomerating ore with a surfactant and polymer mixture A method for improving bacteria and reagent actions on mineral-bearing particles. In the heap leaching process, the method also increases percolation of the leach solution through the heaped ore without the use of high concentrations of cement, high conce... | 08/08/2000 |
| 6086847 | Process for treating iron-containing sulfide rocks and ores A process for treating ores or rocks is provided. The process comprises (1) combining the ores or rocks with an acid passivating agent to produce a first combination; (2) contacting the first combination with an aqueous solution comprising (a) manganate i... | 07/11/2000 |
| 5985221 | Method of recovering precious metals The invention relates to a method of recovering precious metals from oxidic or refractory or semi-refractory ore material containing precious metal. This recovery of precious metal takes place with optimal comminution work and with more efficient and more... | 11/16/1999 |
| 5961833 | Method for separating and isolating gold from copper in a gold processing system A method for separating gold from copper in a gold ore processing system. Gold ore containing elemental gold and elemental copper is treated with an aqueous cyanide solution to produce a liquid product containing a gold-cyanide complex and a copper-cyanid... | 10/05/1999 |
| 5948375 | Biological oxidation of sulphide minerals to recover gold, silver, platinum group metals and base metals A process for treating gold bearing sulphide minerals wherein the minerals are subjected to biological oxidation, the product thereof is separated into light and heavy fractions and gold is recovered from the light fraction using a non-biological process.... | 09/07/1999 |
| 5916534 | Noble metal recovery using selected base metal solubilizing agents at low pulp densities Gold and other noble metal recovery from an ore slurry is improved by operating at low pulp densities, below 35%, and solubilizing base metal present in the slurry by adding to the slurry, either prior to or during the leaching step, one or more solubiliz... | 06/29/1999 |
| 5876588 | Process for removing and recovering copper, silver and zinc from sulfide ores Ores containing copper, zinc, silver in the form of sulfides are treated by a solution of sulfurated sulfite ions and ammonium ions in order to remove most of the metals from the sulfide ores. This treatment renders the resulting gold bearing ores much mo... | 03/02/1999 |
| 5851499 | Method for pressure oxidizing gold-bearing refractory sulfide ores having organic carbon Provided is a method for treating refractory gold-bearing ores that have both sulfide material with which the gold is associated and from which the gold is difficult to separate and having organic carbonaceous material having an affinity for at least one ... | 12/22/1998 |
