Patents by Inventor Daniel Hillier

Daniel Hillier has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for controlling acid in sulfide pressure oxidation processes
    Patent number: 8262770
    Abstract: The present invention is directed to flotation of refractory gold sulfide ores and to pressure oxidized residue neutralization using flotation tailings that have been contacted with an off gas of pressure oxidation.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: September 11, 2012
    Assignee: Barrick Gold Corporation
    Inventors: Daniel Hillier, Yeonuk Choi, Noelene Ahern
  • Process for recovering gold and silver from refractory ores
    Patent number: 7922788
    Abstract: The present invention is directed to flotation of refractory gold sulfide ores in which the ore is ground, floated, the tailings reground, and refloated to produce gold-bearing concentrates.
    Type: Grant
    Filed: September 11, 2008
    Date of Patent: April 12, 2011
    Assignee: Barrick Gold Corporation
    Inventors: Daniel Hillier, Barun Gorain, Jacques McMullen
  • Process for mercury control during pressure oxidation
    Patent number: 7918919
    Abstract: A method for suppressing mercury dissolution during pressure oxidation of precious metal-containing materials in the presence of halogens and halides is provided. Pressure oxidation is performed under controlled oxidative conditions to maintain the mercury predominantly in the solid residue.
    Type: Grant
    Filed: September 11, 2008
    Date of Patent: April 5, 2011
    Assignee: Barrick Gold Corporation
    Inventors: Daniel Hillier, Noelene Ahern, Yeonuk Choi
  • PROCESS FOR RECOVERING GOLD AND SILVER FROM REFRACTORY ORES
    Publication number: 20090074607
    Abstract: The present invention is directed to flotation of refractory gold sulfide ores in which the ore is ground, floated, the tailings reground, and refloated to produce gold-bearing concentrates.
    Type: Application
    Filed: September 11, 2008
    Publication date: March 19, 2009
    Applicant: BARRICK GOLD CORPORATION
    Inventors: Daniel Hillier, Barun Gorain, Jacques McMullen
  • PROCESS FOR CONTROLLING ACID IN SULFIDE PRESSURE OXIDATION PROCESSES
    Publication number: 20090071296
    Abstract: The present invention is directed to flotation of refractory gold sulfide ores and to pressure oxidized residue neutralization using flotation tailings that have been contacted with an off gas of pressure oxidation.
    Type: Application
    Filed: September 12, 2008
    Publication date: March 19, 2009
    Applicant: Barrick Gold Corporation
    Inventors: Daniel Hillier, Yeonuk Choi, Noelene Ahern
  • PROCESS FOR MERCURY CONTROL DURING PRESSURE OXIDATION
    Publication number: 20090074608
    Abstract: A method for suppressing mercury dissolution during pressure oxidation of precious metal-containing materials in the presence of halogens and halides is provided. Pressure oxidation is performed under controlled oxidative conditions to maintain the mercury predominantly in the solid residue.
    Type: Application
    Filed: September 11, 2008
    Publication date: March 19, 2009
    Applicant: BARRICK GOLD CORPORATION
    Inventors: Daniel Hillier, Noelene Ahern, Yeonuk Choi